The ________ are two doughnut-shaped rings of charged particles trapped by Earth's magnetic field.
A. convection cells
B. jet streams
C. Van Allen Radiation Belts
D. Aurora Borealis and the Aurora Australis
Answer: C
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A model rocket sits on the launch pad until its fuel is ignited, blasting the rocket upward. During the short time of blast-off, as the ignited fuel goes down, the rocket goes up because:
a. the fuel pushes on the ground. b. air friction pushes on the escaping fuel. c. the downward force of gravity on the rocket is less than the rate of downward momentum increase of the fuel. d. of none of the above reasons.
When you double the voltage in a simple electric circuit, you double _______.
A. the resistance B. the current C. both of these answers D. neither of these answers
A newton is larger than a pound
Indicate whether the statement is true or false
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