Two men, Joel and Jerry, push against a wall. Jerry stops after 10 min, while Joel is able to push for 5.0 min longer. Compare the work they do
A) Both men do positive work, but Joel does 75% more work than Jerry.
B) Both men do positive work, but Joel does 50% more work than Jerry.
C) Both men do positive work, but Jerry does 50% more work than Joel.
D) Both men do positive work, but Joel does 25% more work than Jerry.
E) Neither of them does any work.
E
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A 1500-W heater is connected to a 120-V line for 2.0 hours. How much heat energy is produced?
A) 11 MJ B) 3.0 kJ C) 0.18 MJ D) 1.5 kJ
The temperature of melting ice is
A) 0°C. B) 32°F. C) both of these
Superposition of waves can produce
A) reinforcement. B) cancellation. C) partial cancellation. D) all the above
A car horn emits a frequency of 400 Hz. A car traveling at 20.0 m/s sounds the horn as it goes away from a stationary pedestrian. What frequency does the pedestrian hear? The speed of sound in air is 343 m/s
A) 378 Hz B) 389 Hz C) 411 Hz D) 422 Hz E) 450 Hz