A 2000 kg car accelerates up to a velocity of 40 m/s in 5.0 seconds. The brakes are applied, and the car is brought to a stop. The work done by the friction in the brakes is
A. 
B. 
C. 
D. 
E. 
C.
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A cyclist races around a circular track at the constant speed of 20 m/s. The radius of the track is 40 m. The centripetal acceleration of the cyclist is
A. 10 m/s2, downward. B. 10 m/s2, toward the center of the track. C. zero. D. 20 m/s2, in the direction of travel.
The special theory of relativity was developed
A) almost in its entirety by Max Planck. B) almost in its entirety by Albert Einstein. C) almost in its entirety by Erwin Schroedinger. D) in its entirety by Planck, Schroedinger, and Einstein. E) by Planck, Schroedinger, Einstein, and many other scientists.
Draw a schematic (not to scale) of filaments, walls, and voids, labeling each
What will be an ideal response?
During summer in the Southern hemisphere of Mars, winds travel
A) from the South Pole to the North Pole B) around the South Pole C) from the North Pole to the South Pole D) around the equator