An automobile traveling along a straight road increases its speed from 30.0 m/s to 50.0 m/s in a distance of 180 m. If the acceleration is constant, how much time elapses while the auto moves this distance?
a. 6.00 s
b. 4.50 s
c. 3.60 s
d. 4.00 s
e. 9.00 s
b
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Suppose you charge two transparencies by rubbing and then hold them near each other without letting them touch, and shake both of them back and forth. Regarding the electric and magnetic forces they exert on each other,
A) they will exert both and electric and magnetic forces. B) they will exert neither electric nor magnetic forces because they are not in contact with each other. C) they will exert electric forces but not magnetic forces. D) they will exert magnetic forces but not electric forces. E) they will exert electromagnetic forces only after five o'clock on Friday afternoons.
The gas in a perfectly insulated system does work at a rate of 13 W. At what rate is the internal (thermal) energy of the gas changing?
A) -13 W B) 13 W C) 0.00 W D) 6.5 W
A long solenoid (radius = 3.0 cm, 2 500 turns per meter) carries a current given by I = 0.30 sin(200 t) A, where t is measured in s. When t = 2.5 ms, what is the magnitude of the induced electric field at a point which is 4.0 cm from the axis of the solenoid?
a. 9.3 × 10^?3 V/m b. 8.0 × 10^?3 V/m c. 6.7 × 10^?3 V/m d. 5.3 × 10^?3 V/m e. 1.9 × 10^?3 V/m
An asteroid revolves around the Sun with a perihelion 0.5 AU and an aphelion of 7.5 AU. What is its period of revolution?
a. 4 years b. 8 years c. 16 years d. 32 years e. 64 years