Engineering College
Answers
Answer 1
An estimate of the safety factor of the shaft is 1.10
We have the following:
Torque=230nm
Diameter=25mm
Yield tension=160mpa
Yield compression=170mpa
To estimate the safety factor of the shaft, we will have to find first the following:
Maximum shear stress:
Shear stress=[tex]\frac{16T}{\pi d^{3} }[/tex]
= [tex]\frac{16*230}{\pi *(25mm*\frac{10^{-3}m }{1mm})^{3} }[/tex]
=75MPa
We, now get the principle stress:
σ[tex]_{1}[/tex]=75MPa
σ[tex]_{2}[/tex]=-75MPa
The torsional yield strength:
Torsional yield strength=(yield strength in tension*yield strength in compression)/(yield strength in tension +yield strength in compression)
=(160*170)/(160+170)
=82.4MPa
Now, we can calculate the factor of safety using this given relation:
Factor of safety=(Torsional yield strength/Maximum shear stress)
=82.4MPa/75MPa
=1.0987
=1.10
Safety factor of the shaft, n=1.10
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Related Questions
Hardened steel cutting edges honed with a/an
A. oilstone
B. Swiss cut file
C. emery block
D. riffler file
Answers
Hardened steel cutting edges honed with option A: An oilstone.
Check more about Honed edge below.
What is a honed edge on a cutting tool?
In order to significantly increase the flake and wear resistance of cutting tools constructed from brittle materials like carbide, edge honing, also known as edge rounding, that is its stabilizes the cutting edge.
Therefore, To hone a chisel, a person need to place a little amount of oil on an oilstone. Here, one need to place the back of the said chisel blade flat on top of the stone and then one can gently rub it very well.
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a design engineer is helping to ensure that the dependencies within her area of expertise are properly defined on the project. the design of several deliverables must be complete before manufacturing can begin. this is an example of what type of dependency?
Answers
The given example in this question is a type of discretionary dependency. It states that the design of several deliverables must be completed before starting manufacturing. So option A is correct answer.
In project management, the dependencies show the relationship of the preceding task to the succeeding task. A task can have many preceding and succeeding tasks. Furthermore, there are three different types of dependencies that are mostly used in project management. These dependencies are discretionary, external, and mandatory.
Discretionary dependency is also known as soft logic. It shows how teams working on a project anticipate the work to be completed. It allows the teams working on the project to optimize the flow of work throughout the project life cycle. It also utilizes the best practices and methodologies based on the team and project manager’s experience.
In the given scenario of the question, the design engineer based on her area of expertise properly defined on the project. She may decide based on her areas of expertise that all other deliverables must be completed before manufacturing can begin.
While the other options are incorrect because:
Mandatory dependency defined that a particular task or activity must be carried out at a specific time. While the external dependency takes input from an external source before proceeding a task.
The complete question is given below:
“ a design engineer is helping to ensure that the dependencies within her area of expertise are properly defined on the project. the design of several deliverables must be complete before manufacturing can begin. this is an example of what type of dependency?
A. Discretionary dependency
B. External dependency
C. Mandatory dependency
”
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When two batteries are connected as a series additive power source, they produce a voltage that is less than either of the batteries connected by itself. True or false?.
Answers
A voltage that is lower than either of the batteries linked alone is produced when two batteries are connected in series to create an additive power source.
The sum of the separate voltages when voltage sources are coupled in series results in the total voltage. Voltage dips in a series circuit are additive, as was previously mentioned. Voltage decreased across a resistor is referred to as a voltage drop. The voltage drop across a resistor increases along with the resistor's resistance. The sum of the individual resistances in a series circuit is the overall resistance. To get the amperage in a series circuit, you must compute the circuit's overall resistance.
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what does the hall-petch equation tell you about the relation between the yield strength of a material and the size of the grain in that material? what is the reason behind this relation?
Answers
According to the Hall-Petch connection, by lowering grain size, we could make materials stronger than their own theoretical strength.
In fact, their strength rises with decreasing grain size until it reaches a peak at about 20–30 nm. The yield strength is further decreased when the grain size grows by annealing at higher temperatures, but further advancement in tensile elongation is constrained. Be aware that ductility increases slightly when grains are refined from 2 to 1 micrometers in the micrometer-grained scale. strength, ductility, and hardness. Nanocrystalline materials exhibit a significant increase in hardness and strength compared to their coarser-grained counterparts as a result of Hall-Petch strengthening (increase in hardness associated with a reduction in average grain size).
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a turbine is supplied with 0 6 m3 s of water from a 0.3 m diameter pipe; the discharge pipe has a 0.4 m diameter. determine the pressure drop across the turbine if it delivers 60 kw
Answers
The pressure drop across the turbine if it delivers 60 kw is 75.4KPa.
The task of providing usable output shaft power to drive the propeller falls on the turbine section of the gas turbine engine. It must also deliver energy to run the compressor and other engine accessories. This is accomplished by expanding the gas at high pressure, temperature, and velocity and transforming the resulting gaseous energy into mechanical energy in the form of shaft power.
The turbine needs a significant volume of air to generate the required amount of electricity. The compressor provides this volume of air by pulling it into the engine and compressing it to provide high-pressure air for the turbine.
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Write a function named reverse that accepts a dictionary from integers to strings as a parameter and returns a new dictionary of strings to integers that is the original's "reverse". The reverse of a dictionary is defined here to be a new dictionary that uses the values from the original as its keys and the keys from the original as its values. Since a dictionary's values need not be unique but its keys must be, it is acceptable to have any of the original keys as the value in the result. In other words, if the original dictionary has pairs (k1, v) and (k2, v), the new dictionary must contain either the pair (v, k1) or (v, k2).
Answers
A function named reverse that accepts a dictionary from integers to strings as a parameter and returns a new dictionary of strings to integers that is the original's "reverse" is given below:
The Function
# Function to create an empty stack. It
# initializes size of stack as 0
def createStack():
stack = []
return stack
# Function to determine the size of the stack
def size(stack):
return len(stack)
# Stack is empty if the size is 0
def isEmpty(stack):
if size(stack) == 0:
return true
# Function to add an item to stack . It
# increases size by 1
def push(stack, item):
stack.append(item)
# Function to remove an item from stack.
# It decreases size by 1
def pop(stack):
if isEmpty(stack):
return
return stack.pop()
# A stack based function to reverse a string
def reverse(string):
n = len(string)
# Create a empty stack
stack = createStack()
# Push all characters of string to stack
for i in range(0, n, 1):
push(stack, string[i])
# Making the string empty since all
# characters are saved in stack
string = ""
# Pop all characters of string and put
# them back to string
for i in range(0, n, 1):
string += pop(stack)
return string
# Driver code
s = "Geeksforgeeks"
print("The original string is : ", end="")
print(s)
print("The reversed string(using stack) is : ", end="")
print(reverse(s))
The Output
The original string is : Geeksforgeeks
The reversed string(using stack) is : skeegrofskeeG
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The reinforcement must be stored in such a manner as to prevent
Answers
The reinforcement must be stored in such a manner as to prevent: deterioration and corrosion.
What does reinforcement mean in Engineering?
Concrete reinforcement is accomplished by inserting deformed steel bars or welded wire fabric inside newly cast concrete. The goal of reinforcing is to give strength to concrete where it is required.
All exposed reinforcing surfaces should be carefully cleaned of loose mortar, corrosion, and other pollutants. To prevent overbuilding and limit bond development loss at rebar deformations, the high-performance protective coating should be placed at a thickness of 305 microns.
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Full Question:
What are the words that complete the sentence below:
The reinforcement must be stored in such a manner as to prevent:
Which of the following accurately describes the 5 why's accident investigation technique
Answers
According to the information, it can be inferred that the correct option is that the term 5 why's accident investigation technique refers to an interrogative technique to identify the causes and effects related to a problem (option B)
What is the 5 whys technique?
5 Whys is a term that refers to an investigative technique used to identify cause and effect relationships related to a specific problem. This investigative technique is generally used in the work environment to identify the origin of an accident at work or production problems and was developed by Sakichi Toyoda.
This technique is mainly based on asking 5 times "Why?" to identify the root of the problem. For example:
The problem: An accident at work that causes an employee to break his armWhy did the employee fall? - Because there was a puddle of oil on the floorWhy was there a puddle of oil on the floor? - Because another employee dropped a bottle full of oilWhy did the other employee drop a bottle of oil? -Because he heard an explosion in the cellar next door and got scared.Why did he hear an explosion in the cellar next door? - Because one of the machines was damaged and exploded.Why did the machine explode? - Because it has not been maintained for more than 4 years.
According to the above, it can be inferred that the correct answer is the option that refers to the 5 questions related to the cause and effect of a problem (option B).
Note: This question is incomplete because there is some information missing. Here is the complete information:
A. 5 questions for a job interview
B. 5 questions related to the cause and effect of a problem
C. 5 questions related to diseases in animals
D. 5 questions about injuries in athletes
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The major advantage to using a bearing installation/removal tool to replace a seal in a housing is that the seal will
A. have its inner edge take all of the insertion force
B. go into the housing much straighter than by manual methods.
C. deform slightly creating a better future seal.
D. go deeper into the housing
Answers
Advantage in using bearing installation or a removal tool to replace a seal in housing is that seal will have its inner edge taken all the insertion force. Hence, an option a is correct.
Sealed bearing are preferred due to basic aspects such as no accidental over lubrication, as they do not need lubrication thus save time in labor, On the inner track of bearing, it has no contact to the seal's bearing. Since, contaminants can cause wearing and tearing of the machine thus reduce lifespan since sealed bearing is more closed type it thus no contaminants enter since no lubricant is required.
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technician a says that the torque multiplication phase can occur when the stator one-way clutch begins to freewheel. technician b says that the torque multiplication phase can occur when the stator one-way clutch locks up. who is correct?
Answers
The correct statement is technician B, that says if the torque multiplication phase can occur when the stator one-way clutch locks up.
Torque multiplication can be defined as a multiplying factor that is used to determine how much added torque is being applied to a vehicles drivetrain. Torque multiplication is calculated with scientific and mathematical precision by rationalizing factory power against all influential physical forces.
In multiplying torque, the stator’s one-way clutch plays an important role. Vortex flow is the fluid circulating between the impeller and the turbine. Vortex flow exists only when there is a difference in rotational speed between the impeller and turbine.
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superheated steam, with a state of 450 ∘c, 1.8 mpa , flows into an adiabatic mixing chamber at a rate of 0.31 kg/s . a second stream of dry, saturated water vapor, at 1.8 mpa , enters the chamber at a rate of 0.15 kg/s . there is no pressure loss in the system and the exit pressure is also 1.8 mpa .
Answers
Under normal relief conditions, where 10% accumulation is used, the permitted pressure drop in discharge pipe from the safety valve in vapor service is 10% of the set pressure, and under emergency fire conditions, where 20% accumulation is used, it is 20% of the set pressure
When calculating the size of the outlet piping, these influences must be considered since the pressure drop in the outlet piping affects the set pressure of a conventional safety relief valve and also affects the capacity of both a conventional and a bellows relief valve. If a pressure drop considerably impacts the set pressure or capacity of the relief valve, the discharge pipe from safety valves in liquid service must be raised. It cannot be smaller than the outlet connection on the safety valve.
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superheated steam enters a nozzle that has an inlet diameter that measures 2.5cm and an outlet diameter that measures 1 cm. its outlet velocity has been measured at 30 m/s. the steam that enters the nozzle is at 6508c and 1350 kpa and the steam that exits the nozzle is at 4008c and 100 kpa.
Answers
A steam nozzle is a channel or duct with a cross-sectional area that varies gradually and is used to transform the heat energy of steam into kinetic energy. The nozzle's shape is created to convert energy with the least amount of loss possible.
Steam loses both pressure and heat as it travels through the nozzle. The Rankine area is equal to the work completed, which is equal to the adiabatic heat decrease. Steam passing through nozzles can be thought of as expanding adiabatically. The gas's speed rises to supersonic (Mach number >1) as it travels through the diverging nozzle. If the flow is sonic at the throat, the flow rate is at its highest for the particular nozzle.
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the beam supports a uniform dead load of 0.4k/ft, a live load of 1.5k/ft and a single live concentrated force of 8k. determine (a) the maximum positive moment at c and (b) the maximum positive vertical reaction at b. assume a is a roller and b is a pin.
Answers
The maximum positive moment at c is 135k/ft
the maximum positive vertical reaction at b is 27k
Part a
Maximum positive moment at c
For maximum positive moment at C and as per Muller's principle, ILD influence line will be on moment at с, this is calculated using the equation below:
Maximum positive moment at c = [tex](\frac{1}{2} *20*5*(0.4+0.5) )+(5*8)[/tex]
= 135k.ft
Part b
Maximum positive vertical reaction at b
To find this using Muller's principle, we keep dead load throughout the span and consequently keep point load at B
Maximum positive vertical reaction at b = [tex](\frac{1}{2} *20*1*(0.4+1.5))+(1*8)[/tex]
= 27k
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The cutting blade's bevel angle on a pair of snips typically measures A. 90 degrees B. 2 degrees C. 5 degrees D. 45 degrees
Answers
The cutting blade's bevel angle on a pair of snips typically measures is option A. 90 degrees.
What is the cutting angle of snip?
These are said to be left- or right-cutting forged steel snips have 90-degree-angled jaws for that of convenient grasping while cutting sheet metal overhead or in a place that is said to be a constricted locations.
Therefore, note that a pair snips is said to be a little pair of shears that is known to be used for cutting sheet metal.
Hence, based on the above, option A is correct.
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a solid round bar with diameter of 2 in has a groove cut to a diameter of 1.8 in, with a radius of 0.1 in. the bar is not rotating. the bar is loaded with a repeated bending load that causes the bending moment at the groove to fluctuate between 0 and 25 000 lbf in. the bar is hot-rolled aisi 1095, but the groove has been machined. a fully corrected endurance limit is
Answers
The groove has been machined a fully corrected endurance limit is = 1.792. Simply maintain all stress amplitudes below the fatigue limit if you wish to design for unlimited life, as was previously suggested.
Life will continue to exist indefinitely as long as even the highest stress amplitude is below the exhaustion limit. The "infinite life" zone for ferrous materials is bounded by a "endurance limit." The endurance limit of a material is a specified stress level below which fatigue damage from stress cycles will not be accumulated.
Given that D=2.1, d(diameter)=1.892, and r=0.17
The material's maximum endurance is 60 kpsi.
Using the Goodman relation, nf equals 0.833.
Safety factor yielding equation: ny= Sy/max= 66/36.828 ny= 1.792
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QUESTION 7
An indemnity clause in a contract may allow the subcontractor hold harmless the contractor in a construction case.
O True
False
Answers
Answer:
True
Explanation:
Ture, the indemnity protects.
Answer: The correct choice is True
a rod consisting of two cylindrical portions ab and bc is restrained at both ends. portion ab ismade of steel, and portion bc is made of yellow brass. if the rod is initially unstressed, determine the compressive force induced in abc when there is a temperature rise of 50◦c
Answers
Given that the rod is initially in an unstressed state, finding the compressive force that is created in ABC as the temperature rises by 55°C yields a value of 156.902 kN.
Portion AB's size is 7.0695 X 10⁴ m².
BC portion's size is 1.96373 X 10³ meters.
505.725 X 106m for free thermal expansion is equal to (0.25)(11.7 X 106)(55) + (0.3)(20.9 X 106)(55).
Induced compressive force-induced shortening P= = 1.7682 X 10⁹ P + 1.455 10⁹ P = 3.2232 X 10⁹ P
3.2232 X 10⁹P = 505.725 X 10⁶ P = 156.902 X 103 N = 156.902 kN with zero net deflection.
As a result, ABC is subjected to a compressive force of 156.902 kN.
An action that seeks to preserve, modify, or deform a body's motion is called applying force.
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air enters a compressor steadily at 1 bar, 290k, and 6 m/s through an inlet duct with an area of 0.1 m2. air exits the compressor at 7 bar, 450k, and 2 m/s. there is heat loss from the compressor at a rate of 180 kj/min. determine the power required to drive the compressor in kw
Answers
The compressor's efficiency must be taken into account; it is equivalent to 0.72, resulting in a needed power of 156*0.72 = 216.8 kW.
The compressor motor nameplate on the majority of industrial three phase air compressors will indicate the line voltage, which is commonly 240 V or 480 V. In our experience, the power factor of 50 to 150 horsepower compressors is approximately 85% when operating normally1. The amount of air the device can pump out is known as the compressor capacity. Compressor capacity and pressure may be easily distinguished from one another since the former reveals "how much" and the latter measures "how strong." the proportion between the maximum compressor load and the average compressor load for a given time period.
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Some industries or lower-order commodities are less sensitive to swings in capital cycles. Explain briefly why there is more risk and sensitivity to swings in the capital cycle with real estate.
Answers
The reason for more risk and sensitivity to swings in the capital cycle with real estate is that there is increased leverage in real estate, illiquidity, the changes in terms of local markets, as well as the need for a helping hand from expert.
What is risk in real estate?
Risk is said to be anything that makes the projected or actual returns on a property or portfolio volatile in the context of commercial real estate investing.
Therefore, note that most shrewd investors not only evaluate their profits but also they do carry out cash flow estimates as well as efficiently manage any form of risk.
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A comparison of parking fee changed at 4 randomly selected parking areas were 12 15 17 and 20 pesos per car find the mean the variance of the parking fees
Answers
The calculated mean value is 16. The sum of all values divided by the total number of values determines the mean (also known as the arithmetic mean, which differs from the geometric mean) of a dataset.
The term "average" is frequently used to describe this measure of central tendency. By dividing the sum of the given numbers by the entire number of numbers, the mean—the average of the given numbers—is determined. Mean is equal to (Sum of All Observations/Total Observations).
Mean=12+15+17+20/4
=16
Special road signage designate 10-cent zones. At the beginning and finish of the zone, there are signs. There is one space available for as long as three or four hours each day. Only specific hours of the day are subject to the 10 cent rate. There may be a Blue Zone in locations where paid parking is not (yet) in effect.
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Give reasons why it is difficult to accurately quantify the quantum of carbon released from terrestrial ecosystems that are as a result of land-use change.
Answers
The reason that makes it is difficult to accurately quantify the quantum of carbon released from terrestrial ecosystems are linked with Sensitivity analysis as well as bias made by gap filling of satellite data.
What is the principal quantum of carbon?
In its ground state, the six electrons of carbon (atomic number 6) in the second row of the periodic table occupy two of its primary energy levels, giving the highest-energy electron a principal quantum number n of 2.
Therefore, note that the act of carrying out Sensitivity analysis is a factor that has hindered the knowledge about the amount of release of carbon in the atmosphere.
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If the Poisson’s ratio of a 5 mm X 5 mm titanium alloy pin is 0.31 and it is elastically loaded in tension from 100 mm to 105 mm. With the aid of a sketch, calculate the new side dimension
Answers
The new dimensions of the titanium alloy pin will be that the width is 0.0775 mm and the length is 4.9225m.
What is Poisson's ratio?
The Poisson's ratio is the proportion of a material's change in width per unit width to its change in length per unit length due to strain. In order for a stable, isotropic, linear elastic material to have a positive Young's modulus, shear modulus, and bulk modulus, the Poisson's ratio must be between 1.0 and +0.5. Poisson's ratio values for the majority of materials fall between 0.0 and 0.5.
The formula for the longitudinal strain is:
= Change in length / Initial length
Based on the information, the longitudinal strain will be:
= 105 - 100 / 100
= 0.05
Poisson ratio will be illustrated as the change in the width divided by the longitudinal strain.
0.31 = ∆w/5 / 0.05
∆w = 0.0775 mm
New side length will be the difference in the changes in the dimensions. This will be:
= w - ∆w
= 5 - 0.0775
= 4.9225m
In conclusion, the length is 4.9225m.
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a non-rotating solid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is loaded with a repeated bending load that causes the bending moment at the groove to fluctuate between 0 and 25000 lbf-in. the bar is hot-rolled aisi 1095, but the groove has been machined. determine the factor of safety guarding against first-cycle yielding and the factor of safety against fatigue failure based on
Answers
A non-rotating solid round bar with diameter of 2-in has a groove cut to a diameter of 1.8-in, with a groove radius of 0.1-in. the bar is loaded with a repeated bending load that causes the bending moment at the groove to fluctuate between 0 and 25000 lbf-in. the bar is hot-rolled aisi 1095, but the groove has been machined. The factor of safety guarding against first-cycle yielding will be nf=1.11 and the factor of safety against fatigue failure will be ny=2.41.
From the table A-20 Deterministic ASTM minimum tensile and yield strengths for HR and CD steels, we have approximately:
D= 2.1, d (diameter) = 1.892, r= 0.117
Endurance limit for the material= Se'= 60 kpsi
According to the goodman relation= nf= 0.833
Yielding factor of safety: ny= Sy/σmax= 66/36.828
ny= 1.792
When the factor of safety is 1, the substance is practically at yield. Based on the greatest anticipated load situation, the majority of designers aim for a safety factor of between 2 and 4. Unless the maximum expected load is repeatedly applied, if some design elements experience yield, part failure is not necessarily the result.
The element of safety with regard to a fatigue failure at a specific design life is known as the fatigue safety factor. The Factor of Safety can go up to 15. Values less than one for the Fatigue Safety Factor imply failure before the design life is achieved.
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All of the following statements are true except: group of answer choices installing the cross with the zerk fitting backwards will make it difficult, if not impossible, to lube the u-joint after the driveshaft is installed on the vehicle. universal joint lubricant is nlgi #5, with an extreme pressure (ep) additive. sometimes, universal joint cups are held in place with plastic material that is injected into a hole in the yoke. usually galling will be found on a trunnion 180 degrees to brinelling.
Answers
This failure is usually caused by someone who does not install the U-joint in the correct orientation in the drive shaft. The front U-joint of a drive shaft must be installed so the driving torque compresses the U-joint lube fitting.
The U-joint that connects the differential and drive shaft. It may even enable two drive shafts to connect to one another in some situations when the drive shaft is connected to the transmission. Drive shafts can be moved up and down with the suspension while they are in motion thanks to universal joints, which enable power to be transferred even when the drive shaft is not in a straight line between the transmission and drive wheels. U-joints or universal joints are located at the ends of the drive shaft of rear-wheel-drive automobiles. Normally, the drive shaft has two u-joints that need to be replaced. A double-cardan joint, which consists of two u-joints, can be found on some driveshafts' front. When letting off and pressing the accelerator, in particular, a poor u-joint might make your car jolt or make a loud noise while you're driving. At certain speeds, vibration from the center or back of the car can also be caused by a damaged u-joint.
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how do you draw this
Answers
Answer:
I could draw it but I cannot see the dimensions clearly. Also, be precise in question. In what projection are you drawing it.
do the cube method, two of the same shapes then connect them by their edges
consider a solid stainless steel wire with a thermal con- ductivity of 14 w/m⋅k. the wire has a diameter of 1 mm, has a resistivity of 45 × 10−8ω⋅m, and carries a current of 120 a. (a) determine the rate of heat generated within the wire (w/m3 ), and (b) calculate the maximum temperature rise in the wire.
Answers
The heat generated within the wire is 1.05 x 10¹⁰ W/m³ with a maximum temperature of 589.5 K.
Heat is the energy that has a correlation with the resistivity of the material. Resistivity depends on the resistance and wire dimension where the resistance of the material can be written as
R = ρ.L/A
where R is resistance, ρ is resistivity, L is the length of the wire and A is surface area.
The given parameters from this question are
σ = 14 W/m.K
ρ = 45 x 10¯⁸ Ωm
I = 120 A
d = 1 mm
r = 0.5 mm = 5 x 10¯⁴ m
Calculate the surface area
A = πr²
A = π(5 x 10¯⁴)²
A = 7.86 x 10¯⁷ m²
In 1 m³, the length of wire should be
V = A . L
1 = 7.86 x 10¯⁷ . L
L = 1272727.273 m
Find the resistance of wire per m³
R/V = ρ.L/A
R/V = 45 x 10¯⁸ . 1272727.273 / 7.86 x 10¯⁷
R/V = 728925.62 Ω/m³
Find the heat generated per m³ by using power
P/V = I² . R
P/V = 120² . 728925.62
P/V = 1.05 x 10¹⁰ W/m³
Find the heat generated per m by using power
P/L = P/V
P/L = P/V . A
P/L = 1.05 x 10¹⁰ . 7.86 x 10¯⁷
P/L = 8253 W/m
Find the maximum temperature
T = (P/L) / σ
T = 8253 / 14
T = 589.5 K
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Give reasons why it is difficult to accurately determine the amount of carbon released from terrestrial ecosystems that are as a result of land-use change
Answers
Calculating the carbon footprint is difficult because of a lack of knowledge of all the factors of carbon emission on land.
Imagine drinking concentrated orange juice endlessly. because surely this is the best way to lose weight. Orange juice is recommended in moderation, but doctors are not the first to recommend it to people trying to lose weight.
Just as we don't want people to believe that more orange juice is the solution to the obesity pandemic, we don't want people to believe that the best way to fight climate change is to recycle more.
Recycling and blackouts are great steps towards a more sustainable society, but nothing is more important to the climate than reducing meat consumption, air travel, and driving.
People with good intentions often make the wrong decisions when it comes to reducing their carbon footprint.
For example, a test was conducted in which participants were selected and then the participants were then presented with 15 behaviors and asked to classify the behavior as low, medium, or high (with low representing less than 1% of a person's carbon footprint and high representing more than 5%).
Passenger car behavior is rightly regarded as critical in reducing greenhouse gas emissions.
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The reasons why it is hard to accurately determine the amount of carbon released from terrestrial ecosystems is that they are linked to sensitivity analysis and bias brought about by satellite data gap filling.
Additionally, the algorithms used for remote sensing do not effectively take into consideration environmental pressures such rooting depth, particularly in dry locations where plants depend on deep roots to access and maintain water availability.
What are the limitations about?
The timing and size of terrestrial NPP are controlled by a variety of environmental factors on a global scale, such as climate, topography, as well as soils, plant and other forms of microbial characteristics, etc.
However, the relative contributions of these environmental factors to global NPP change over time and space. Globally, climatic change, including variations in temperature and precipitation, had a marginally favorable effect on NPP between 1982 - 1999.
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Behavior when the capacitor is connected is connected to a DC source
(relationship between current and voltage with all the derived formulae):
charging and discharging process
Answers
The thing that happens when a capacitor is connected to a DC source is that Capacitors charge up until the voltage across the capacitor is equal to the externally applied voltage when they are linked across a direct current DC supply voltage.
How does a capacitor behave in a DC circuit?
Capacitors slowly charge in a DC circuit until the charging voltage of the capacitor is equal to the supply voltage. The capacitor will not permit any extra charges to travel through it after it has been fully charged.
Note that the link between a capacitor and voltage and current can be summarized as follows: the capacitance and the rate of rise or fall of the voltage determine how much current flows through a capacitor. A strong positive current will be produced through a capacitor if the voltage across the capacitor rises quickly.
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technician a says it is important that a full battery test series be done before trying to test the starter system. technician b says the internal condition of the engine has little effect on the operation of the starting system.
Answers
When technician a says it is important that a full battery test series be done before trying to test the starter system, and technician b says the internal condition of the engine has little effect on the operation of the starting system, then only technician a is correct.
Ideally, before testing the starter system, full battery test series is to be completed. The reason for this is that both the performance of starter and battery system is so closely related.
And it should also be replaced if it fails the load test. The operation of the starting system will be influenced by the internal condition of the engine.
Therefore, technician a is right.
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Donald is installing a fuse on a neutral. In a residential, 120 V, 20 A  Circuit, what should the fuse be rated? A. If you should never be installed in the neutral. B.40A C.20 slow-blo D.20 A
Answers
The location at which a fuse should be installed in the 120 V, 20 A, residential circuit is in the live wire on the circuit, not in the neutral wire. The correct option is therefore;
A. A fuse should never be installed in the neutral.
What is the function of a fuse?
The function of an electric fuse, which is a safety device, is to provide protection from an over flow of current in the circuit.
Generally, an electric fuse consists of a metal wire or filament that melts, due to its rise in temperature when excessive current or current at an unsafe level flows in the circuit, thereby opening the circuit, to protect the circuit and its components.
The effect of excessive or over current in a circuit is that it causes the circuit component to heat up and burn, such that the circuit and device stops functioning, and in some cases, may cause a fire.
The fuse, which is a circuit safety device, should be the first contact of the current.
Therefore;
The location of a fuse should be at the entrance point of current to the load which is the live wire.
The fuse should not be installed on the neutral wire, gives that the burning of the fuse in the neutral, in the event of an over current, leaves the high current in the circuit, which can cause unwanted damage to the circuit.
The correct option is therefore option A;
A. A fuse should never be installed in the neutral
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