A 50-gram superball traveling at 25.0 m/s is bounced off a brick wall and rebounds at 22.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the average acceleration of the ball during this time interval?
13,400 m/s2
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The coils of a solenoid are stretched so that the length of the solenoid is twice its original length. Assuming the same current is passed though the solenoid before and after it is stretched, how does the magnetic field inside the solenoid change, if at all, as a result of the stretching?
a) The magnetic field after the stretching is one-fourth the value it was before stretching. b) The magnetic field after the stretching is one-half the value it was before stretching. c) The magnetic field after the stretching is the same as the value it was before stretching. d) The magnetic field after the stretching is twice the value it was before stretching e) The magnetic field after the stretching is four times the value it was before stretching.
The expansion of the universe is due to the
A) motion of galaxies through space B) expansion of space within galaxies C) expansion of stars within galaxies D) expansion of space between galaxies
Twenty milliseconds is
a. 0.00002 s. b. 0.0002 s. c. 0.002 s. d. 0.02 s. e. 20000 s.
Starting from rest, a 2-kg body acquires a speed of 8 m/s in 2 seconds. The net force acting on the body is
a. 2 N. b. 4 N. c. 8 N. d. 16 N. e. 6 N.