Transformers: A transformer is a device used to
A. transform an alternating current into a direct current.
B. transform a direct current into an alternating current.
C. increase or decrease an ac voltage.
D. increase or decrease a dc voltage.
Answer: C
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The circular path of a satellite orbiting Earth is characterized by a constant
A) speed. B) acceleration. C) radial distance. D) all of the above E) none of the above
Constant Acceleration Kinematics: A certain test car can go from rest to 32.0 m/s in 3.88 s. The same car can come to a full stop from that speed in 4.14 s. What is the ratio of the magnitude of the starting acceleration to the stopping acceleration?
A. 0.937 B. 1.07 C. 0.878 D. 1.14
A ball that gains speed as it rolls down a hill experiences a
A) net torque. B) net force. C) both of these D) neither of these
Einstein's special relativity is based upon two postulates. The most radical of the two postulates states that
A. the classical velocity addition formula still holds at relativistic speeds. B. there is no ether surrounding the Earth. C. the speed of light is finite. D. the speed of light is the same for all observers in all inertial reference frames.