What does surface gravity measure?
A. the gravitational acceleration at a planet's or star's surface
B. the tendency of a planet's surface to collapse under gravity
C. the attraction between the surfaces of two massive objects
D. how fast an object needs to go to escape a planet's gravity
Answer: A
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Two masses are connected by a string which passes over a pulley with negligible mass and friction. One mass hangs vertically and one mass slides on a 30.0 degrees incline. The inclined surface has a coefficient of kinetic friction of 0.200. The vertically hanging mass is 4.00 kg and the mass on the incline is 6.00 kg. The acceleration of the 4.00 kg mass is (the initial velocity of the 6.00 kg mass is up the incline)
A. 7.16 
B. 5.84
C. 2.98
D. 1.53
E. 3.90
If ? = 8.0 V, at what rate is that emf providing energy to the circuit shown below?
a.
8.4 W
b.
7.6 W
c.
5.6 W
d.
11 W
e.
2.0 W
A billiard ball collides in an elastic head-on collision with a second identical ball. What is the kinetic energy of the system after the collision compared to that before collision?
a. the same as c. twice b. one fourth d. four times
Land and sea breezes result from
a. the Coriolis force. b. convection cycles. c. low-pressure areas. d. high-pressure areas.