题目内容

If a glass of water is on a table with a piece of paper under it, it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly. This is because,

A. the force on the glass will be less
B. the momentum of the paper will be greater
C. the time for the pull will be less
D. the coefficient of kinetic friction will be less
E. None of the others

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The dimensional equivalent of the quantity impulse in terms of the fundamental quantities （mass, length, time） is which of the following（）

A. ML/T
B. ML^2/T^2
C. MLT
D. ML/T^2
E. None of the others

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Two points on a merry-go-round are located at distances from the center r1 and r2, where r1 ＜ r2. While the merry-go-round is in the process of speeding up to operational speed, which of the follow

A. ω1 = ω2
B. α1 = α2
C. Vt1 = Vt2
D. All of the equations are correct

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If two particles have equal momenta, are their kinetic energies equal（）

A. yes, always
B. no, never
C. no, except when their speeds are the same
D. yes, as long as they move along parallel lines

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Object 1 has twice the mass of Object 2. Both objects have the same kinetic energy. Which of the following statements is true（）

A. Both objects can have the same magnitude of momentum
B. Object 1 has a momentum of greater magnitude than Object 2
C. The magnitude of the momentum of Object 2 is four times that of Object 1
D. All the statements are false
E. All the statements are true

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If a glass of water is on a table with a piece of paper under it, it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly. This is because,

A. the force on the glass will be less B. the momentum of the paper will be greater C. the time for the pull will be less D. the coefficient of kinetic friction will be less E. None of the others

The dimensional equivalent of the quantity impulse in terms of the fundamental quantities （mass, length, time） is which of the following（）

Two points on a merry-go-round are located at distances from the center r1 and r2, where r1 ＜ r2. While the merry-go-round is in the process of speeding up to operational speed, which of the follow

If two particles have equal momenta, are their kinetic energies equal（）

Object 1 has twice the mass of Object 2. Both objects have the same kinetic energy. Which of the following statements is true（）

A. the force on the glass will be less
B. the momentum of the paper will be greater
C. the time for the pull will be less
D. the coefficient of kinetic friction will be less
E. None of the others