Graphical Analysis: The figure shows a graph of the velocity of an object as a function of time. What is the displacement of the object from 0 s to 8.0 s?
A. 20 m
B. 40 m
C. 60 m
D. 80 m
E. 100 m
Answer: C
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An ice cube that contains small pieces of iron floats on water. When the ice melts, the water level
A) rises. B) falls. C) remains unchanged.
The mathematical model of quantum mechanics was principally founded by
a. Max Planck. b. Albert Einstein. c. Neils Bohr. d. Erwin Schrödinger. e. Werner Heisenberg.
A Carnot engine operates between a high temperature reservoir at 435 K and a river with water at 280 K. If it absorbs 3700 J of heat each cycle, how much work per cycle does it perform?
A) 1318 J B) 2382 J C) 1449 J D) 2251 J
A rock attached to a string swings in a vertical circle. Which free-body diagram could correctly describe the force(s) on the rock when it is at the highest point, where
is the normal force, 
is weight, and 
is tension?
a.
b.
c.
d.
e.