Three ice skaters meet at the center of a rink and each stands at rest facing the center, within arm's reach of the other two. On a signal, each skater pushes himself away from the other two across the frictionless ice. After the push, skater A with mass mA = 90.0 kg moves in the negative y-direction at 2.50 m/s and skater B with mass me = 80.0 kg moves in the negative x-direction at 4.00 m/s. Find the x- and y-components of the 70.0 kg skater C's velocity (in m/s) after the push. HINT vox Vey = = m/s m/s

Three ice skaters meet at the center of a rink and each stands at rest facing the center, within arm's reach of the other two. On a signal, each skater pushes himself away from the other two across the frictionless ice. After the push, skater A with mass mA = 90.0 kg moves in the negative y-direction at 2.50 m/s and skater B with mass me = 80.0 kg moves in the negative x-direction at 4.00 m/s. Find the x- and y-components of the 70.0 kg skater C's velocity (in m/s) after the push. HINT vox Vey = = m/s m/s

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Description: Three ice skaters meet at the center of a rink and each stands at rest facing the center, within arm's reach of the other two. On a signal, each skater pushes himself away from the other two across thefrictionless ice. After the push, skater A with

Physics for Scientists and Engineers with Modern Physics

10th Edition

ISBN:9781337553292

Author:Raymond A. Serway, John W. Jewett

Publisher:Raymond A. Serway, John W. Jewett

Chapter9: Linear Momentum And Collisions

Section9.6: The Center Of Mass

Problem 9.7QQ: A baseball bat of uniform density is cut at the location of its center of mass as shown in Figure...

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Sand from a stationary hopper falls onto a moving conveyor belt at the rate of 5.00 kg/s as shown in Figure P8.64. The conveyor belt is supported by frictionless rollers and moves at a constant speed of v = 0.750 m/s under the action of a constant horizontal external force Fext supplied by the motor that drives the belt. Find (a) the sands rate of change of momentum in the horizontal direction, (b) the force of friction exerted by the belt on the sand, (c) the external force Fext, (d) the work done by Fext in 1 s, and (e) the kinetic energy acquired by the falling sand each second due to the change in its horizontal motion. (f) Why are the answers to parts (d) and (e) different? Figure P8.64
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