A 0.32 kg ball is moving horizontally 30. m/s just before bouncing off a wall, thereafter moving 25. m/s in the opposite direction
(a) What is the magnitude of its change in momentum?
(b) What percentage of the kinetic energy was lost in the collision?
(a) 18. N-s
(b) 31.% lost
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A person who sees more clearly under water without eyeglasses or a facemask is
A) nearsighted. B) farsighted. C) neither of these
Consider a solid object which is subjected to a net torque. That object will experience which of the following?
A) a linear acceleration and an angular acceleration B) an angular acceleration C) a constant angular velocity D) a changing moment of inertia
With respect to the stars, the Moon
A) circles the Earth. B) and the Earth circle each other. C) remains stationary while the Earth circles about it. D) does not rotate about its own axis as the Earth does.
The work function of a surface is
What is this quantity in eV?
A. 2.46 B. 3.13 C. 3.93 D. 4.08 E. 4.70