A 75 kg road bicycle racer rides down the highway from Pike’s peak. During one stretch of the ride, he descends 150 m while accelerating from 35 km/hr to 55 km/hr. Assuming rolling friction to be negligible, what is the average power supplied by the Earth through the gravitational force during the time (12.5 s)?
A. 700 W
B. 5.4 kW
C. 9.1 kW
D. 417 W
D. 417 W
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If the orbit of the Moon carries it through the umbra of Earth's shadow, you see a__________
A) total solar eclipse B) partial lunar eclipse C) partial solar eclipse D) total lunar eclipse
If the distance between two point charges is doubled, the mutual force between them will be changed by what factor?
a. 4 b. 2 c. 1/2 d. 1/4 e. 1
Time Dilation: Observer A sees a pendulum oscillating back and forth in a relativistic rocket and measures its period to be TA. Observer B moves along with the rocket and measures the period of the pendulum to be TB. What is true about these two time measurements?
A. TA > TB B. TA = TB C. TA < TB D. TA could be greater or smaller than TB depending on the direction of the motion.
In a head-on automobile collision, a person's momentum could be reduced from 2000 kg m/s to zero in just 0.1 s. If this occurs, the average force exerted to stop the person is
A. 2,000 N. B. 20,000 N. C. 200 N. D. This can't be answered without knowing the person's mass