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chp 10 hw 1

# chp 10 hw 1 - Ch10 HW1 f10 Page 1 of 5 WebAssign Ch10 HW1...

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Web Assign Ch10 HW1 f10 (Homework) Ashlyn Baum Physics 303K, section B, Fall 2010 Instructor: Jim Chelikowsky Current Score : 22 / 22 Due : Sunday, November 14, 2010 11:30 PM CST 1. 4/4 points Question: MI3 10.1.X.009 A ball whose mass is 0.1 kg hits the floor with a speed of 8 m/s and rebounds upward with a speed of 6 m/s. If the ball was in contact with the floor for 1.5 ms ( 1.5 10 -3 s), what was the average magnitude of the force exerted on the ball by the floor? F avg = 933.33 933 N. Calculate the magnitude of the gravitational force that the Earth exerts on the ball: mg = .98 0.98 N In a collision, for a brief time there are forces between the colliding objects that are much greater than external forces. Which of the following is true during the collision between the bouncing ball and the floor? Solution or Explanation p y = F y t p y,f - p y,i = -mg t Pay careful attention to the sign of the y component of the momentum. The initial p y is negative, while the final p y is positive. During the collision, the electric force of the atoms in the floor acting on the atoms in the ball turned out to be much larger than the gravitational force. 2. 1/1 points Question: MI3 10.2.X.011 3. 17/17 points Question: MI3 10.5.X.015 The due date for this assignment is past. Your work can be viewed below, but no changes can be made. The magnitude of the force exerted by the floor is much greater than the magnitude of the gravitational force exerted by the Earth. The magnitude of the gravitational force exerted by the Earth is much greater than the magnitude of the force exerted by the floor. The force exerted by the floor and the gravitational force exerted by the Earth are

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chp 10 hw 1 - Ch10 HW1 f10 Page 1 of 5 WebAssign Ch10 HW1...

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