In a problem using energy considerations to solve for the speed of a ball thrown from the top of a building when it strikes the ground below, where should the potential energy have its zero value?
a. It should be at the level from where the ball is thrown.
b. It should be at the ground level where the ball hits.
c. It should be slightly below ground level so the potential energy is always positive.
d. It doesn't matter since only differences in potential energy matter in solutions.
D
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Potential: How much kinetic energy does a proton gain if it is accelerated, with no friction, through a potential difference of 1.00 V? The proton is 1836 times heavier than an electron, and e = 1.60 × 10-19 C.
A. 1836 eV B. 1.00 eV C. 1.60 × 10-19 eV D. 1.00 J E. 1836 J
A 2.0 kg object is moving at a velocity of 12.0 m/s. The drag force 6.0 N. If the drag force is given by the equation F = 
then the value of b is
a. 
b. 
c. 
d. 
e. 
The energy per unit volume in an electromagnetic wave is
A) equally divided between the electric and magnetic fields. B) mostly in the electric field. C) mostly in the magnetic field. D) all in the electric field. E) all in the magnetic field.
The hydrogen lines of spectral type A main sequence stars are ____
a. the strongest b. the weakest c. the most narrow d. useful in determining apparent magnitude e. used to estimate the luminosity of the star