A race car moving with a constant speed of 60 m/s completes one lap around a circular track in 50 s. What is the magnitude of the acceleration of the race car?
A. 8.8 m/s2
B. 7.5 m/s2
C. 9.4 m/s2
D. 6.3 m/s2
E. 5.3 m/s2
Answer: B
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The type of current supplied by a battery is __________
Fill in the blank(s) with correct word
The Crab Nebula is the remnant of ____
a. the SN1987a supernova b. a supernova which triggered a mass extinction on Earth c. a supernova recorded by Chinese astronomers d. a supernova which triggered the formation of the Sun e. a supernova in the Large Magellanic cloud
Two planes of charge with no thickness, A and B, are parallel and vertical. The electric field in the region between the two planes has magnitude 
. The electric field in the region to the left of A and the electric field in the region to the right of B may have the magnitudes
a.
0, 0.
b.
.
c.
,
d.
given in any answer above.
e.
given only in answer (a) or (b) above.
A cannon ball and a bowling ball were dropped at the same time from the top of a building. The cannon ball is more massive than the bowling ball. At the instant before the balls hit the sidewalk, the cannon ball had greater
A. kinetic energy
B. Newton's law
C. resistance
D. momentum