题目内容

A valid unit for momentum is which of the following（）

A. kg∙m/s^2
B. kg/m^2
C. kg∙m/s
D. N∙m
E. None of the others

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Three satellites are launched into space connected together. Once in deep space, an explosive charge separates the three satellites and they move apart. The satellites each have different masses with

A. The one with mass m1 receives the greatest impulse
B. The one with mass m3 receives the greatest impulse
C. The all must receive equal impulses
D. Although one or more of the above statements could be true in special cases, they are not always true

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A high-diver of mass 70 kg jumps off a board 10 m above the water. If, 1.0 s after entering the water his downward motion is stopped, what average upward force did the water exert（）

A. 100 N
B. 686 N
C. 980 N
D. No answer is correct
E. 0 N
F. 10 N

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A girl and her bicycle have a total mass of 40 kg. At the top of the hill her speed is 5.0 m/s. The hill is 10 m high and 100 m long. If the force of friction as she rides down the hill is 20 N, what

A. 5.0 m/s
B. 10 m/s
C. 11 m/s
D. She stops before she reaches the bottom
E. 16 m/s
F. 19 m/s

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A block is projected with speed v across a horizontal surface and slides to a stop due to friction. The same block is then projected with the same speed v up an incline where is slides to a stop due t

A. This problem cannot be solved since it was not indicated whether the horizontal surface and the incline both had the same coefficient of kinetic friction
B. The case on the horizontal surface had the least decrease in total mechanical energy
C. The case on the inclined surface had the least decrease in total mechanical energy
D. In both cases the decrease in mechanical energy was the same
E. None of the others

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A valid unit for momentum is which of the following（）

A. kg∙m/s^2 B. kg/m^2 C. kg∙m/s D. N∙m E. None of the others

Three satellites are launched into space connected together. Once in deep space, an explosive charge separates the three satellites and they move apart. The satellites each have different masses with

A high-diver of mass 70 kg jumps off a board 10 m above the water. If, 1.0 s after entering the water his downward motion is stopped, what average upward force did the water exert（）

A girl and her bicycle have a total mass of 40 kg. At the top of the hill her speed is 5.0 m/s. The hill is 10 m high and 100 m long. If the force of friction as she rides down the hill is 20 N, what

A block is projected with speed v across a horizontal surface and slides to a stop due to friction. The same block is then projected with the same speed v up an incline where is slides to a stop due t

A. kg∙m/s^2
B. kg/m^2
C. kg∙m/s
D. N∙m
E. None of the others