A closed cubical chamber resting on the floor contains oil and a piston
If you push down on the piston hard enough to increase the pressure just below the piston by an amount ?p, which of the following statements is correct? (There could be more than one correct choice.)
A) The pressure on the sides of the chamber will not increase.
B) The pressure at the top of the oil will increase by less than ?p.
C) The pressure everywhere in the oil will increase by ?p.
D) The increase in the force on the top of the chamber will be the same as the increase in the force on the bottom of the chamber.
E) The pressure at the bottom of the oil will increase by more than ?p.
C, D
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A CD with a diameter of 12.0 cm starts from rest and with a constant angular acceleration of 1.0 
acquires an angular velocity of 5.0 rad/sec. The CD continues rotating at 5.0 rad/sec for 15.0 seconds and then slows to a stop in 12.0 second with a constant angular deceleration. What is the centripetal acceleration of a point 4.0 cm from the center at the time 15.0 seconds from the start?
A. 0.5 
B. 1.0
C. 1.8
D. 2.0
E. 2.6
Electric resistance in our skin is lowered when our skin is
A) moist. B) dry. C) none of the above
A light ray in material 1 goes into material 2. The angle of incidence in material 1 is 40.0? and the angle of refraction in material 
and the angle of refraction in material 2 is 
If the index of refraction of material 1 is 1.60, what is the index of refraction of material 2?
A. 3.20 B. 2.00 C. 1.88 D. 1.41 E. 1.20
Which of the following asteroids is now officially a dwarf planet?
A. Itokawa B. Ceres C. Eros D. Mathilde E. Ida