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此套试卷由25道选择题以及3道大题组成
每道大题含有不同数量的小题
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Part A选择题部分:
Part B简答题部分
Solution to Problem 2:
(a) Immedaitely before its collision with the second bead,
the first bead has a speed of v1= 2Fd/m. Immediately afterwards, it has a speed of zero.
(b) Immedaitely before its collision with the third bead,
the second bead has a speed of v1= 2Fd/m. Imme
diately afterwards, it has a speed of zero.
(c) The time between subsequent collisions of the first bead with the second is governed by
where a = F/m so that the average speed of the first bead is vo = d/t = v1/2. The first bead moves at an average speed which is half the speed v1 of the shock wave that travels down the wire.
(d) Suppose that after a time, the clump of beads that have collided (and are all stuck together) is travelling with a constant (terminal) velocity v. InatimeintervalΔt there are vΔt/d further collisions increasing the mass of the clump by mvΔt/d and increasing the momentum of the clump by mv2Δt/d. Since F =Δp/Δt, v =
h √
Fd/m. The shock wave moves at a speed of v1 / 2.
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