What happens during a partial lunar eclipse?
a. Earth only partially enters the penumbra
b. The Sun only partially enters the umbra.
c. The Moon only partially enters the penumbra.
d. Earth only partially enters the umbra.
e. The Moon only partially enters the umbra.
e
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If an object is located 20 m to the left of the origin at 1:00 PM, and later the object is located 30 m to the right of the origin at 2:00 PM, then the displacement from 1:00 PM to 2:00 PM is
A. 50 m to the right. B. 30 m to the right. C. 25 m to the right. D. 20 m to the left. E. 10 m to the left.
Two flat rectangular mirrors are set edge to edge and placed perpendicular to a flat nonreflecting surface. A light ray that reflects from mirror 1 at angle qM1 then strikes the second mirror and reflects at qM2 such that the angle between the ray reaching mirror 1 and the ray leaving mirror 2 is 180°. The angle between the two mirrors is
a. 0°. b. 45°. c. 90°. d. 150°. e. 235°.
A glider on an air track is connected by a spring to the end of the air track. If it is pulled 3.5 cm in the ?x direction away from its equilibrium point and then released from rest at t = 0, what is the initial phase 
?
A. 0
B. 
C. 
D. 
E. 
F. Some other result (specify)
What is the special property of a semipermeable membrane that makes osmosis possible?
A) The pores in the membrane only allow water to pass through. B) Water only moves through the membrane in one direction. C) Only the ions travel through the membrane. D) Ions only move one way through the membrane. E) none of the above