A 46-kg skater is standing still in front of a wall. By pushing against the wall, she propels herself backward with a velocity of-1.2 m/s. Her hands are in contact with the wall for 0.80 s. Find the magnitude of the average force exerted on her by the wall. Hint: how does impulse relate to her momentum after pushing off? O 27 N O 200 N O 69 N 45 N

A 46-kg skater is standing still in front of a wall. By pushing against the wall, she propels herself backward with a velocity of-1.2 m/s. Her hands are in contact with the wall for 0.80 s. Find the magnitude of the average force exerted on her by the wall. Hint: how does impulse relate to her momentum after pushing off? O 27 N O 200 N O 69 N 45 N

College Physics

10th Edition

ISBN:9781285737027

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter6: Momentum And Collisions

Section: Chapter Questions

Problem 4WUE: A soccer player runs up behind a 0.450-kg soccer ball traveling at 3.20 m/s and kicks it in the same...

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A soccer player runs up behind a 0.450-kg soccer ball traveling at 3.20 m/s and kicks it in the same direction as it is moving, increasing its speed to 12.8 m/s. (a) What is the change in the magnitude of the balls momentum? (b) What magnitude impulse did the soccer player deliver to the ball? (c) What magnitude impulse would be required to kick the ball in the opposite direction at 12.8 m/s, instead? (See Section 6.1.)
A 5-kg cart moving to the right with a speed of 6 m/s collides with a concrete wall and rebounds with a speed of 2 m/s. What is the change in momentum of the cart? (a) 0 (b) 40 kg m/s (c) 40 kg m/s (d) 30 kg m/s (e) 10 kg m/s
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