An engine manufacturer makes the claim that the engine they have developed will, on each cycle take 100 j of heat out of boiling water at 100 °c, do mechanical work of 80j, and exhaust 20 j of heat at 10 °c.
what, if anything, is wrong with this claim?
a) there is nothing wrong with this claim because 100 j = 20 j + 80 j.
b) this engine violates the first law of thermodynamics because 100 j + 20 j ≠ 80 j.
c) an engine would operate by taking in heat at the lower temperature and exhausting heat at a higher temperature.
d) the heat exhausted must always be greater than the work done according to the second law of thermodynamics.
e) the efficiency of this engine is greater than the ideal carnot cycle efficiency.
Answers: 3
Physics, 22.06.2019 15:20, sandrinedionne7153
A20 cm long spring is attached to a wall. the spring stretches to a length of 22 cm when you pull on it with a force of 100 n. what is the spring constant
Answers: 3
Physics, 22.06.2019 19:30, paulstanley972
Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.
Answers: 1
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