How fast must a hydrogen atom be traveling for its kinetic energy to be just enough to excite the ground-state atom to its first excited state in a collision? (1 eV = 1.60 × 10-19 J, mH ? mproton = 1.67 × 10-27 kg)
A) 44.2 km/s
B) 21.7 km/s
C) 66.5 km/s
D) 113 km/s
E) 51.0 km/s
A
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What is the gravitational force between two 7.00-kg balls, when they are 35.0 cm apart? G = 6.67 x 10-11 N•m2/kg2
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A 100 gram aluminum container is at 
grams of water at 
is added to the aluminum container. What is the final temperature of the water and the aluminum? (specific heat of water
specific heat of aluminum 
A. 58.3
B. 63.6
C. 68.5
D. 73.1
E. 83.3
Energy Conservation With Conservative Forces: Joe and Bill throw identical balls vertically upward. Joe throws his ball with an initial speed twice as high as Bill. If there is no air resistance, the maximum height of Joe's ball will be
A. four times that of Bill's ball. B. two times that of Bill's ball. C. equal to that of Bill's ball. D. eight times that of Bill's ball. E. roughly 1.4 times that of Bill's ball.
According to Newton's third law, the Voyager probes pulled just as hard on Jupiter as it did on them when they flew past it. Why were they accelerated enough to leave the solar system but Jupiter still is in orbit about the Sun?
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