An acceleration may result from
a. a change in speed.
b. a change in direction.
c. a change in both speed and direction.
d. all of these
d
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A 40-kg boy is standing on the edge of a stationary 30-kg circular platform that is free to rotate. The boy tries to walk around the platform in a counterclockwise direction. As he does:
a. the platform doesn't rotate. b. the platform rotates in a clockwise direction just fast enough so that the boy remains stationary relative to the ground. c. the platform rotates in a clockwise direction while the boy goes around in a counterclockwise direction relative to the ground. d. both go around with equal angular velocities but in opposite directions.
A solid cylinder with a radius of 10 cm and a mass of 3.0 kg is rotating about its center with an angular speed of 3.5 rad/s. What is its kinetic energy?
A) 0.18 J B) 0.092 J C) 0.96 J D) 1.05 J E) 0.53 J
A student adds two vectors with magnitudes of 200 and 70 . Which one of the following is the only possible choice for the magnitude of their sum?
a. 100 c. 200 b. 280 d. 70
The south end of a bar magnet is pushed downward toward a wire loop in the plane of the paper. In which direction is the induced current, and which way is the induced magnetic field?
A. clockwise, into the paper B. clockwise, out of the paper C. counter-clockwise, into the paper D. counter-clockwise, out of the paper E. There is no induced current.