A child does 350 J of work while pulling a box from the ground up to his tree house at a steady speed with a light rope. The tree house is 4m above the ground. What is the mass of the box?
A) 8.9 kg B) 8.0 kg C) 5.3 kg D) 6.7 kg
A
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There must be equal amounts of mass on both side of the center of mass of an object
A) True B) False
The changing shapes of constellations in the night sky is caused by
A) the rotation of our planet about its axis. B) the revolution of our planet around the Sun. C) the movement of our planet within the Milky Way. D) the tilt of Earth's axis.
Magnetic Moment: What is the magnetic moment of a rectangular loop having 120 turns that carries 6.0 A if its dimensions are 4.0 cm × 8.0 cm?
A. 0.23 A ? m2 B. 2.3 A ? m2 C. 23 A ? m2 D. 230 A ? m2
Including relativistic effects, doubling the speed of a object:
a. doubles its momentum. b. more than doubles its momentum. c. less than doubles its momentum. d. has no effect on its momentum.