1. Multiple Choices (3 points for each, total 30 points) 1. A moving particle is at the tip of the position vector F(x,

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1 Multiple Choices 3 Points For Each Total 30 Points 1 A Moving Particle Is At The Tip Of The Position Vector F X 1 (47.67 KiB) Viewed 24 times

1. Multiple Choices (3 points for each, total 30 points) 1. A moving particle is at the tip of the position vector F(x, y), the magnitude of its velocity is: ( ) dr dr A. C. dr dt A. 2a1. B. C. 2a+g. D. dr dr dr 2. A massless rope with one end connected to the ceiling of an elevator, the other end connected to a block as shown in Fig.1. When the elevator moves upward with constant acceleration at the tensional force in the rope is equal to one half the maximum force it could withstand. What is the acceleration of the elevator when moving upward at the moment the rope is drawn apart? ( ) B. 2(a+g). D. a+g. d.x Fig 1 3. Two particles A and B with masses of me and ms (m>ms) and velocity VA and V (v> Vs), respectively. Under the same impulse, then: A. The magnitude of the momentum increment of A is less than that of B; B. The magnitude of the momentum increment of A is greater than that of B; C. The magnitude of the momentum increment of A is equal to that of B; D. The increments of velocity of A and B are equal.