Two friends are standing on opposite ends of a canoe that is initially at rest with respect to a frictionless lake. The person in the front throws a very massive ball toward the back, and the person in the back catches it
After the ball is caught, the canoe is
A) stationary. B) moving backward. C) moving forward.
A
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A 90.0 kg scuba diver with tanks and equipment is submerged and floating underwater in seawater. The volume of the seawater displaced by the scuba diver with tanks and equipment is
A. 0.0508 
B. 0.0575
C. 0.0667
D. 0.0708
E. 0.0878
Magnification by a lens would be greater if light
A) propagated instantaneously. B) traveled faster in glass than it does. C) traveled slower in glass than it does. D) beams spread less. E) none of the above
The Cenozoic era began about how many million years ago?
a. 65 b. 545 c. 3 d. 245
The remains of type II supernovae (massive star, core collapse supernovae) are seen in the sky as
A) nebulae that are shrinking as the central mass pulls them in. B) nebulae that are expanding at thousands of kilometers per hour. C) nebulae that are stellar nurseries. D) white dwarfs. E) white holes.