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Chapter 4: Q. 3 (page 105)
Answer Problems 3 through 5 by choosing one of the eight labeled acceleration vectors or selecting option
3. At this instant, the particle has steady speed and is curving to the right. What is the direction of its acceleration?
The acceleration of the particle at that instant is zero.
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A circular track has several concentric rings where people can run at their leisure. Phil runs on the outermost track with radius rP while Annie runs on an inner track with radius rA = 0.80rP. The runners start side by side, along a radial line, and run at the same speed in a counterclockwise direction. How many revolutions has Annie made when Annie’s and Phil’s velocity vectors point in opposite directions for the first time?
You are given the equations that are used to solve a problem. For each of these, you are to
a. Write a realistic problem for which these are the correct equations. Be sure that the answer your problem requests is consistent with the equations given.
b. Finish the solution of the problem, including a pictorial representation.
You are asked to consult for the city’s research hospital, where a group of doctors is investigating the bombardment of cancer tumors with high-energy ions. As figure shows, ions are fired directly toward the center of the tumor at speeds of . To cover the entire tumor area, the ions are deflected sideways by passing them between two charged metal plates that accelerate the ions perpendicular to the direction of their initial motion. The acceleration region is long, and the ends of the acceleration plates are from the target. What sideways acceleration is required to deflect an ion to one side?
. II A wheel initially rotating at experiences the angular acceleration shown in FIGURE EX4.39. What is the wheel's angular velocity, in rpm, at ?
FIGURE EX4.39
37. II FIGURE EX4.37 shows the angular acceleration graph of a turntable that starts from rest. What is the turntable's angular velocity at (a) , (b) , and (c) ?
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