Which object has zero acceleration?
A) one at rest
B) one moving at constant velocity
C) one in mechanical equilibrium
D) all of the above
E) none of the above
Answer: D
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Potential Energy: A hydrogen atom consists of a proton and an electron. If the orbital radius of the electron increases, the electric potential energy of the electron due to the proton
A. increases. B. decreases. C. remains the same. D. depends on the zero point of the potential.
Impulse: A very light ping-pong ball moving east at a speed of 4 m/s collides with a very heavy stationary bowling ball. The Ping-Pong ball bounces back to the west, and the bowling ball moves very slowly to the east. Which object experiences the greater magnitude impulse during the collision?
A. Neither; both experienced the same magnitude impulse. B. the Ping-Pong ball C. the bowling ball D. It is impossible to tell since the actual mass values are not given. E. It is impossible to tell since the velocities after the collision are unknown.
Two objects, one of mass m and the other of mass 2m, are dropped from the top of a building. When they hit the ground
A) both of them will have the same kinetic energy. B) the heavier one will have twice the kinetic energy of the lighter one. C) the heavier one will have four times the kinetic energy of the lighter one. D) the heavier one will have times the kinetic energy of the lighter one.
In a completely filled atomic shell,
a. the intrinsic spin of the electrons does not produce a resultant magnetic moment. b. the orbital motion of the electrons does not produce a resultant magnetic moment. c. the atom will be an alkali metal. d. only (a) and (b) are correct. e. none of the above are correct.