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Discussion-13 - dance as a couple in virtue of the law of...

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Impulse and Momentum Di i #13 Ch 7 4 & 7 5 Discussion #13 – Ch. 7.4 & 7.5 Physics 125 – Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] Office Hours: 2:00 4:00 / Mon & Tue in Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.
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Example #1 Two disco dancers collide in midair. Bob is 60 kg and was going vertically North at 0.5 m/s just before the collision. Alice is 40 kg and was going horizontally East at 1.0 m/s just before the collision. After the collision they dance as a couple in virtue of the m A. 1.5 law of momentum conservation. What is the magnitude of the couple’s velocity just after the collision? s m B. 0.5 s m C. 1 s m D. 2 s E. Bob really thought that he has impressed Alice with his . moves
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Test #1 Same problem as above - Two disco dancers collide in midair. Bob is 60 kg and was going vertically North at 0.5 m/s just before the collision. Alice is 40 kg and was going horizontally East at 1.0 m/s just before the collision. After the collision they dance as a couple in virtue of the law of momentum conservation. What is the
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Unformatted text preview: dance as a couple in virtue of the law of momentum conservation. What is the angle the couple makes with the west-east direction ? 126 ° A. 126 B. 98 ° C. 25 ° D. 37 ° E. Instead, Alice thought that Bob was as flexible as an . .. . ironing board Example #2 Ball A of mass 1 kg collides elastically (but not head-on) with ball B of mass 2 kg which is initially at rest. Find the final speed of ball A. m A. 2.6 s m B. 9.5 s m C. 3.4 s m D. 4.8 s m E. 7.1 . s Test #2 Ball A of mass 1 kg collides elastically (but not head-on) with ball B of mass 2 kg which is initially at rest. Find the final speed of ball B. m A. 2.6 s m B. 9.5 s m C. 3.4 s m D. 4.8 s m E. 7.1 . s Test #3 A ball of mass 1 kg collides elastically (but not head-on) with the floor. What is the magnitude of the impulse imparted by the ball to the floor ? NOTE : only the vertical component of the ball’s momentum changes during the impact. m A. 12 kg s m B. 85 kg s m C. 64 kg s m D. 96 kg s m E. 78 kg . s...
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