One of the strange consequences of special relativity is that
A. two events may appear simultaneous to one observer but not another.
B. people moving at high speeds will feel crushed by length contraction.
C. forces that are not real can be felt by some observers.
D. time can move backward.
Answer: A
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Scientists suspect that Mars once had a global magnetic field. Assuming this is true, which of the following could explain why Mars today lacks a global magnetic field like that of Earth?
A) Mars's interior has cooled so much that its molten core layer no longer undergoes convection. B) Mars rotates much slower than the Earth. C) The Martian core is made of rock, while Earth's core is made of metal. D) Mars is too far from the Sun to have a global magnetic field.
The first rover to explore Mars in 1997 was called
A) Opportunity B) Spirit C) Sojourner D) Curiosity
A magnetic field will deflect
a. an alpha particle. b. a beta particle. c. a gamma ray. d. an x-ray. e. all of the above.
The slope of a velocity vs. time graph is the acceleration
Indicate whether the statement is true or false