An auto moves at a steady 50 mph down a straight level road. Which of the following is the forward drive force on the auto?
A) The forward push by the road on the tires.
B) The drive force is actually zero in this example, because the auto is moving at a constant speed in a straight line.
C) The forward push by the engine on the car.
D) The backward push by the engine on the car.
E) The backward push by the drive tires on the road.
A
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The figure is a graph of 
for a car. Solve graphically for the distance traveled from t = 10 s to t = 15 s.
A. 75 m
B. 70 m
C. 67 m
D. 69 m
Among these choices, which is the first thing that happens in thehistory of the universe?
a) formation of nuclei of helium b) binding of electrons to nuclei c) first stars form d) universe becomes transparent e) first supernova explosions occur
In a spectroscopic binary, if a pair shows a combined set of lines tonight, but a maximum split two nights later, its orbital period must be:
A) one day. B) two days. C) four days. D) eight days. E) twelve days.
A stone is thrown vertically upward. At the top of its vertical path its acceleration is
A) zero. B) 10 m/s2. C) somewhat less than 10 m/s2. D) undetermined.