A heat engine operating at maximum efficiency has an efficiency of 25%. The temperature of the cold reservoir is 300 K. What is the temperature of the hot reservoir?
A) 350 K
B) 375 K
C) 400 K
D) 450 K
E) 500 K
C
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Consider massive gliders that slide friction-free along a horizontal air track. Glider A has a mass of 1 kg, a speed of 1 m/s, and collides with Glider B that has a mass of 5 kg and is at rest. If they stick upon collision, their speed after collision wil
A) 1/4 m/s. B) 1/5 m/s. C) 1/6 m/s. D) 1 m/s. E) none of the above
Doubling only the amplitude of a vibrating mass-on-a-spring system produces what effect on the system frequency?
A) increases the frequency by a factor of 5 B) increases the frequency by a factor of 4 C) increases the frequency by a factor of 3 D) increases the frequency by a factor of 2 E) produces no change
If the diameter of a radar dish is doubled, what happens to its resolving power assuming that all other factors remain unchanged?
A) The resolving power quadruples. B) The resolving power doubles. C) The resolving power is cut in half. D) The resolving power is reduced to one-quarter its original value.
A proton with mass 1.67 × 10^-27 kg moves in an accelerator with a speed of 0.600c. What is its total energy? (c = 3.00 × 10^8 m/s)
a. 3.26 × 10^-10 J c. 0.540 × 10^-10 J b. 1.88 × 10^-10 J d. 2.51 × 10^-10 J