The significance of a Carnot engine is that
A. all automobiles operate on the Carnot cycle
B. it has the maximum possible efficiency of any engine operating between the same two temperatures
C. it violates the second law of thermodynamics
D. it violates the first law of thermodynamics
B. it has the maximum possible efficiency of any engine operating between the same two temperatures
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Radioactive Decay: The decay rate of a radioactive sample decreases from 175 kBq to 12.4 kBq in 18.3 s. What is the half-life of this sample?
Fill in the blank(s) with the appropriate word(s).
Two circular loops carry identical currents, but the radius of one loop is twice that of the other. How do the magnetic fields at the centers of the loops compare?
a) In both cases, the magnetic field at the center would be zero tesla. b) The magnetic field at the center of the larger loop is twice that at the center of the smaller loop. c) The magnetic field at the center of the larger loop is the same as that at the center of the smaller loop. d) The magnetic field at the center of the larger loop is one-half that at the center of the smaller loop. e) The magnetic field at the center of the larger loop is one-fourth that at the center of the smaller loop.
A rubber ball and a lump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall
Which objects experiences the greater momentum change? A) the ball B) the putty C) Both experience the same non-zero momentum change. D) Both experience zero momentum change. E) Cannot be determined from the information given.
The reason that small planets tend to lose interior heat faster than larger planets is essentially the same as the reason that ________
A) Earth contains more metal than the Moon B) a large baked potato takes longer to cool than a small baked potato C) thunderstorms tend to form on hot summer days D) gas bubbles form and rise upward in boiling water