1206_chap19

1206_chap19 - ME240 Agenda: 19.2ImpulseandMomentum...

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d ME 240 Agenda: 19.2 Impulse and Momentum Ch. 19 Problems – due Wednesday HW: 19.51, 19.55 Supplemental: 19.53, 19.57
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Angular Momentum I r m v  Angular momentum about a point O: OG HI  The 2 nd term can add or subtract depending on the oment” that the linear moment that the linear momentum generates about point O.
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2 nd Form of the Principle of Angular pulse and Momentum Impulse and Momentum   2 1 21 t OO O t Md t H H Angular impulse about point O: If no moment about point O, total angular momentum is conserved constant OA OB HH
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A rotor weighing 150 lbs is not balanced, with the mass center G a distance d=4 in. th t f tt i Wh l i from the center of rotation. Wheel is spun from rest with a constant torque M=32 ft lbs, determine the wheels radius of gyration k G if it takes 2 sec to spin up the wheel to 140 rpm. Neglect friction. 7 32
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19.59 Two research (satellites (m A =250 kg, I A =350kg m 2 , m B =50kg, I B =16 kg
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1206_chap19 - ME240 Agenda: 19.2ImpulseandMomentum...

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