Chapter 12: Q.38 (page 332)
Evaluate the cross products and . (part )


Short Answer
The cross product is and into the page. (part a)
The cross product isand out of the page.(part b)
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Chapter 12: Q.38 (page 332)
Evaluate the cross products and . (part )


The cross product is and into the page. (part a)
The cross product isand out of the page.(part b)
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14. II The four masses shown in FIGURE EX12.13 are connected by massless, rigid rods.
a. Find the coordinates of the center of mass.
b. Find the moment of inertia about a diagonal axis that passes through masses B and D.

The 20-cm-diameter disk in FIGURE EX12.20 can rotate on an axle through its center. What is the net torque about the axle?

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?
A person鈥檚 center of mass is easily found by having the person lie on a reaction board. A horizontal, 2.5-m-long, 6.1 kg reaction board is supported only at the ends, with one end resting on a scale and the other on a pivot. A 60 kg woman lies on the reaction board with her feet over the pivot. The scale reads 25 kg. What is the distance from the woman鈥檚 feet to her center of mass?
A 100g ball and a 200 g ball are connected by a , 30- cm long massless, rigid rod. The balls rotate about their center of mass at 120 rpm. What is the speed of the 100 g ball?
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