题目内容

What flight airlines should do for delayed or cancelled passengers（）

A. Provide food and drink
B. Provide overnight accommodation
C. Allow delayed passengers to cancel their trip
D. Offer transportation on another airline or offer compensation

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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

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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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What flight airlines should do for delayed or cancelled passengers（）

A. Provide food and drink B. Provide overnight accommodation C. Allow delayed passengers to cancel their trip D. Offer transportation on another airline or offer compensation

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,

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（）

A. Provide food and drink
B. Provide overnight accommodation
C. Allow delayed passengers to cancel their trip
D. Offer transportation on another airline or offer compensation