What does the equivalence principle say?
A) Gravity is the same thing as curvature of spacetime.
B) The effects of gravity are exactly equivalent to the effects of acceleration.
C) You cannot distinguish between motion at constant velocity and weight in a gravitational field.
D) The effects of relativity are exactly equivalent to those predicted by Newton's laws of motion.
E) All observers must always measure the same (equivalent) weights for moving objects.
B
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points away from the viewer in case (b).] 
In which direction is the wave moving?
A. A B. B C. C D. D E. Toward the viewer F. Away from the viewer T. This is impossible.
A body is oscillating up and down at the end of a spring. Let's consider when the body is at the top of its up-and-down motion.The acceleration is zero
a. True b. False Indicate whether the statement is true or false
Compound Microscope: A compound microscope has a 18-cm-long barrel and an objective lens with a focal length of 8.0 mm. What is the focal length of the eyepiece to give a total magnification of 240? It is adjusted for minimum eyestrain for persons with a near point of 25 cm.
A. 1.3 m B. 1.5 cm C. 1.9 cm D. 2.1 cm E. 2.3 cm
Tides caused mainly by the Moon occur in Earth's
A) oceans. B) atmosphere. C) interior. D) all of the above