A small rubber ball is thrown at an initially stationary bowling ball on a frictionless surface. The rubber ball makes a one-dimensional elastic collision and bounces back along the same line. After the collision, compared to the bowling ball, the rubber ball has
1.a larger magnitude of momentum and more kinetic energy.
2.a smaller magnitude of momentum and less kinetic energy.
3.a smaller magnitude of momentum and more kinetic energy.
4.the same magnitude of momentum and more kinetic energy.
3
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If you wanted to know how much the temperature of a particular piece of material would rise when a known amount of energy through the process of heating was added to it, which of the following quantities would be most helpful to know?
A) initial temperature B) specific heat C) density D) coefficient of linear expansion E) thermal conductivity
An iron rod becomes magnetic when
A) opposite ions accumulate at each end. B) its atoms are aligned. C) the net spins of many internal electrons are aligned. D) its electrons stop moving and point in the same direction.
The velocity of a mass attached to a spring is given by v = (1.5 cm/s) sin(?t + ?/2 ), where ? = 3.0 rad/s. What is the corresponding expression for x?
A) x = -(4.50 cm) sin(?t + ?/2 ) B) x = (4.50 cm) cos(?t + ?/2 ) C) x = -(0.50 cm) cos(?t - ?/2 ) D) x = -(0.50 cm) cos(?t + ?/2 ) E) x = -(0.50 cm) sin(?t + ?/2 )
The magnetic moment of an electron (charge = ?e; mass = me) moving in a circular orbit of radius r with speed v about a nucleus of mass mN is proportional to
a. r. b. v. c. vr. d. evr. e. mNvr.