A Carnot heat engine and an irreversible heat engine both operate between the same high temperature and low temperature reservoirs. They absorb the same energy from the high temperature reservoir as heat. The irreversible engine:
A. does more work
B. transfers more energy to the low temperature reservoir as heat
C. has the greater efficiency
D. has the same efficiency as the reversible engine
E. cannot absorb the same energy from the high temperature reservoir as heat without violating the second law of thermodynamics
Answer: B. transfers more energy to the low temperature reservoir as heat
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Processes can proceed from disorder to order
A) when input energy is supplied. B) on an everyday occurrence. C) never. D) none of the above
The first of two identical boxes of mass m is sitting on level ground. The second box is sitting on a ramp that makes an angle with the ground. When a force of magnitude F is applied to each box in a direction parallel to the surface it is on, upwards on the box on the ramp, neither box moves. Which statement comparing the friction force on the box on the level, Fs,L, to the friction force on the
box on the ramp, Fs,R, is correct?
a. Fs,R = Fs,L.
b. Fs,R > Fs,L.
c. Fs,R
Rotational Kinetic Energy: A hoop with a mass of 2.75 kg is rolling without slipping along a horizontal surface with a speed of 4.5 m/s when it starts down a ramp that makes an angle of 25° below the horizontal. What is the forward speed of the hoop after it has rolled 3.0 m down as measured along the surface of the ramp?
A. 4.9 m/s B. 6.3 m/s C. 5.2 m/s D. 5.7 m/s E. 8.0 m/s
How do typical wind speeds in Jupiter's atmosphere compare to typical wind speeds on Earth?
A) They are much faster than hurricane winds on Earth. B) They are about the same as average winds on Earth. C) They are slightly faster than average winds on Earth. D) They are slightly slower than average winds on Earth.