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Chapter 2: Q25P (page 45)
(a) What is the vector whose tail is at m and whose head is at m? (b) What is the magnitude of this vector?
(a) The required vector is m.
(b) The magnitude of this vector is m.
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A thin diverging lens of focal length 25cm is placed 18cm to the right of a point source of blue light on the axis of the lens. Where is the image of the source? Is it a real or a virtual image? If you placed a sheet of paper at the location of the image, what would you see on the paper?
A proton has mass. What is the magnitude of the impulse required to increase its speed from 0.990c to 0.994c?
You drop a piece of paper, and observe that it eventually falls at a constant speed. Which of the following statements about this situation is based on a fundamental physics principle? (a) Because the paper is moving downward, we know that it experiences a nonzero net downward force. (b) Since the momentum of the paper does not change from one instant to the next, , and therefore the net force on the paper must be zero. (2) You give a push to a toy car, which rolls away smoothly on a wooden floor. Why does the car keep moving after your hand is no longer touching it? (a) The momentum of the car just after it leaves your hand reflects the total impulse given to the car by your hand. (b) Your hand continues to exert a force on the car even after the car and hand no longer touch.
A paddle ball toy consists of a flat wooden paddle and asmall rubber ball that are attached to each other by an elastic band (Figure 2.61). You have a paddle ball toy for which the mass of the ball is 0.015 kg, the stiffness of the elastic band is 0.9 N/m, and the relaxed length of the elastic band is 0.30 m. You are holding the paddle so the ball hangs suspended under it, when your cat comes along and bats the ball around, setting it in motion. At a particular instant the momentum of the ball is , and the moving ball is at location relative to an origin located at the point where the elastic band is attached to the paddle.
(a) Determine the position of the ball 0.1 s later, using of 0.1 s.
(b) Starting with the same initial position
and momentum , determine the position of the ball 0.1 s later, using a of 0.05 s. (c) If your answers are different, explain why.
Question:A ball moves in the direction of the arrow labelled in Figure. The ball is struck by a stick that briefly exerts a force on the ball in the direction of the arrow labelled. Which arrow best describes the direction of, the change in the ball's momentum?
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