Which equation best expresses the first law of thermodynamics, assuming Q is heat, U is internal energy, and W is work?
2 answers:
Answer:
(d) is the correct option ''''
Explanation:
The first law of thermodynamics states the law of conservation of energy i. e. heat energy can neither be created nor be destroyed. The mathematical expression that show the first law of thermodynamics is as follows:
Where
is the change in internal energy
Q is the amount if heat added to the system
W is the work done by the system
Hence, the correct option is (d)
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Answer:
J = 357.5 kg*m/s
Explanation:
- The impulse exerted on Katelyn when she was on the force plate, is equal to the change in her momentum, according to Newton's 2nd Law.
- Assuming as the positive direction the upward direction (coincident with the positive y-axis) we can express the initial momentum as follows:
- By the same token, the final momentum is as follows:
- As we have already said, the impulse J is just equal to the change in momentum, i.e., the difference between (2) and (1):
Answer:
Explanation:
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angle at which the rope is supported = 30°
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