Question

on a frictionless table collides with a stationary 7. A 10 kg ball moving at a velocity of 2 m/s 5 kg ball. Find the final velocity of each ball if the collision is inelastic? If the collision is elastic and the 10 kg ball comes to a complete stop, what is the final velocity of the second ball? 8. A woman stands at the center of a platform. She is holding a dumb-bell in each hand, and outstretched. The woman and the platform rotate with an angular speed of her arms are 5 rads/s. In this position, the total moment of the rotating system is 5.40 kg m2 While the woman and platform rotate, the woman tucks her arms in up to her body. By doing this, the moment of inertia of the system is reduced to 3.80 kg m2. Assuming that friction is negligible, what is her new angular speed? 9. A 240 N force is pulling an 85 kg refrigerator across a horizontal surface. The force acts angle of 20° above the surface. The coefficient of kinetic friction is 0.2, and the at an refrigerator moves a distance of 8 m. Find the work done by the (a) pulling force, (b) normal force, (c) frictional force, and (d) gravitational force. 10. A 75 kg skier rides a 2830-m-long lift to the top of a mountain. The lift makes an angle of 14.6° with the horizontal. What is the change in the skier's gravitational potential energy?

Answer 1

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