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Chapter 12: Q. 21 (page 331)
The axle in FIGURE EX12.21 is half the distance
to the rim. What is the net torque about the axle? II
sd
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An 800 g steel plate has the shape of the isosceles triangle shown in FIGURE P12.50. What are the x- and y-coordinates of the center of mass?
Hint: Divide the triangle into vertical strips of width dx, then relate the mass dm of a strip at position x to the values of x and dx.
What is the angular momentum vector of the rotating bar in
A high-speed drill reaches in .
a. What is the drill's angular acceleration?
b. Through how many revolutions does it turn during this first ?
An athlete at the gym holds a 3.0 kg steel ball in his hand. His BI0 arm is 70 cm long and has a mass of 3.8 kg , with the center of mass 40% at of the arm length. What is the magnitude of the torque about his shoulder due to the ball and the weight of his arm if he holds his arm
a. Straight out to his side, parallel to the floor?
b. Straight, but below horizontal?
The two objects in FIGURE EX12.29 are balanced on the pivot. What is distance ?
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