The plates of a parallel plate capacitor of capacitance 
are horizontal. Into the gap a slab of dielectric material with 
is placed, filling the bottom half of the gap between the plates. What is the resulting new capacitance?
A.
B.
C.
D.
E.
Answer: E
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Three equal negative charges are placed at three of the four corners of a square. The direction of the electric field at the remaining corner of the square is
A. along the line connecting this corner with the opposite corner, and toward that corner. B. along the line connecting this corner with the opposite corner, but away from that corner. C. along a side of the square away from one of the charges. D. along a side of the square toward one of the charges. E. no direction, zero field.
A foul ball is hit straight up into the air with a speed of 30 m/s, and air effects are negligible. (a) Calculate the time required for the ball to rise to its maximum height
(b) Calculate the maximum height reached by the ball above the point where it hit the bat. (c) Determine the times at which the ball passes a point 25 m above the point where it was hit by the bat. (d) Explain why there are two answers to part (c).
A _____ is a collapsing cloud of gas and dust destined to become a star
A) protostar B) protocloud C) stellar cluster D) stellar association
A type-II supernova
a. occurs when a white dwarf's mass exceeds the Chandrasekhar limit. b. is the result of helium flash. c. is characterized by a spectrum that shows hydrogen lines. d. occurs when the iron core of a massive star collapses. e. c and d