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Chapter 4: Q. 15 (page 105)

15. FIGURE Q4.15 shows a pendulum at one end point of its arc.

a. At this point, 蝇is positive, negative, or zero? Explain.

b. At this point, 伪is positive, negative, or zero? Explain.

FIGURE Q4.15

Short Answer

Expert verified

Part (a) At the end point the angular velocity is zero.

Part (b) At the end point angular acceleration is negative.

Step by step solution

01

Part (a)

The relation between tangential velocity and angular velocity is

v=r蝇

Here isv tangential velocity and is 蝇angular velocity.

When the pendulum is at the end point of the arc then蝇 is zero because at the end point the velocity is zero.

02

Part (b)

(b) At the end point angular acceleration '伪' is negative because angular velocity changes from positive value to zero.

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