The rate of seafloor spreading can be calculated by
A) the magnetic pattern generated at the ocean floor.
B) knowing the dates for magnetic pole reversals, and the distance from the location of a known reversal site to the ocean ridge.
C) looking at the magnetic tape recording of the ocean floor.
D) the rate of seafloor spreading cannot be calculated.
Answer: B
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An astronaut floating in the International Space Station catches a Frisbee thrown directly toward his or her center of mass. Does the astronaut + Frisbee’s change in thermal energy ?Uth depend on whether the Frisbee is spinning or not, and if so, which case makes it larger?
A. ?Uth is greater if the Frisbee is spinning. B. ?Uth is the same in both cases. C. ?Uth is greater if the Frisbee is not spinning. D. One needs more information to tell.
If the tension, 
, is 15 N and the magnitude of the acceleration, a, is 3.0 m/s2, what is the mass, m, of the suspended object? Assume that all surfaces and the pulley are frictionless.
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?
A. 3.1 kg B. 2.5 kg C. 2.8 kg D. 2.2 kg E. 3.7 kg
Exhibit 16-1
A graph of position versus time for an object oscillating at the free end of a horizontal spring is shown below.
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?
Use this exhibit to answer the following question(s).
Refer to Exhibit 16-1. The point at which the object has negative velocity and zero acceleration is
A. A B. B C. C D. D E. E
Eighty-eight prominent groups of stars in the sky are called the _______________
a. constellations b. local groups c. clusters d. galaxies