Answer:
NICE
Explanation:
The bottom of a pan is made of a 4-mm-thick aluminum layer. In order to increase the rate of heat transfer through the bottom of the pan, a design was proposed for the bottom that consists of a 3-mm-thick copper layer sandwiched between two 2-mm-thick aluminum layers. Assume a perfect contact between the layers. Will the new design conduct heat better
Answer:
Yes, the new product will not conduct heat better
Explanation:
The bottom of the former product is made up of a 4mm thick aluminum layer
The new design is made up of two 2mm thick aluminum layer with a 3mm thick copper layer sandwiched in between.
These two materials are great conductors of heat.
As for copper, if one end is heated , the other ends rapidly reaches the same temperature, Copper is known as the best conductor of heat, that is, allows quick heat transfer. This ability of copper makes it highly used in applications where quick heat transfer is important, like the saucepans where rapid heat transfer is required.
As for aluminum, it is also a great heat conductor and twice as good as copper.
But the heat conductivity of copper is greater than aluminum and this will allow a faster heat transfer between the layers.
Bob would like to run his house off the grid, therefore he needs to find out how many solar panels and batteries he needs to buy.
The power output of a 250 W solar panel is p=250−10(t−5)2 watts for the average 10 hour day. He plans on using 12 V, 120 A⋅h batteries and would like to able to store 3 days worth of energy. Bob's house uses 1100 kW⋅h per month (30 days).
Answer:
stink
Explanation:
Considering how likely the risk is to affect the company’s profits is part of which component of risk management?
Risk identification
Risk assessment
Risk control
Risk mitigation
In your own words how does an airplane take off?
Answer:
Explanation:
How does an aircraft take off?
They are lift, weight, thrust and drag. Lift pushes the airplane up. The way air moves around the wings gives the airplane lift. The shape of the wings helps with lift, too.
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How do we define energy efficiency?
А.) the ratio of the actual output energy to the input energy
B.) the ratio of power gain to power loss
C.) the product of input power and output power
D.) the sum of potential and kinetic energy
Answer:
a
Explanation:
that is what energy efficiency is
on the same scale for stress, the tensile true stress-true strain curve is higher than the engineeringstress-engineering strain curve. Explain whether this condition also holds for a compression test.
Answer:
The condition does not hold for a compression test
Explanation:
For a compression test the engineering stress - strain curve is higher than the actual stress-strain curve and this is because the force needed in compression is higher than the force needed during Tension. The higher the force in compression leads to increase in the area therefore for the same scale of stress the there is more stress on the Engineering curve making it higher than the actual curve.
Hence the condition of : on the same scale for stress, the tensile true stress-true strain curve is higher than the engineering stress-engineering strain curve. does not hold for compression test
Consider one-dimensional heat conduction through a large plane wall with no heat generation that is perfectly insulated on one side and is subjected to convection and radiation on the other side. It is claimed that under steady conditions, the temperature in a plane wall must be uniform (the same everywhere). Is this claim reasonable
Answer:
YES, this claim reasonable
Explanation:
the temperature in a plane wall is uniform since no heat is penetrating into the large plane wall and therefore, there is no heat transfer from the wall under steady conditions,
This condition will be met only when there are no temperature differences within the wall and the the outer surface temperature of the wall is equal to the temperature of its surrounding.
Therefore, Yes, this claim is reasonable