Which is the best description of power? A. the amount of kinetic energy lost during motion
1 answer:
Answer:
D. a measure of how fast a machine performs work
Explanation:
Power can be defined as the energy required to do work per unit time.
Mathematically, it is given by the formula;
Hence, the best description of power is that, it is a measure of how fast a machine performs work.
This can be calculated by using the mathematical expression below;
But we know that,
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Answer:
Explanation:
Hello,
In this problem, the piston-cylinder assembly make us state the energy balance as:
Thus, we must now compute in terms of Cv as follows:
Now, since heat is given off, its sign is negative, thus, the work is computed as:
This work means that work was done over the system in order to allow the compression.
The suppositions were:
- The change in the internal energy is a function of the temperature.
- Air is an ideal gas.
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