1. An asteroid of mass 58,000 kg carrying a negative charge of is from a second asteroid of mass carrying a negative charge of What is the net force the asteroids exert upon each other?

570,000 N
0.000040 N
510,000 N
0.0062 N

2. Object A has charge and is positioned from object B, which has charge . What is the magnitude of the electric field at the center of object A? Let the constant k =

1.4 Af- 1015 N/C
2.8 Af- 1015 N/C
7.0 Af- 1016 N/C
2.8 Af- 1016 N/C

3. Monochromatic light is incident on a metal surface and electrons are ejected. Then the intensity of the light is increased while the frequency is kept constant. What changes, if any, will occur to the ejection rate and maximum energy of the electrons?

greater rate; same maximum energy
greater rate; greater maximum energy
same rate; greater maximum energy
same rate; same maximum energy