Chapter_9__Student_Problems

# Chapter_9__Student_Problems - Problem 9-26 vf vi F A 1.2 kg...

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Problem 9-26 m = 1.2 kg v i = -25 m/s v f = 10 m/s ∆t = .020 s F∆t = ? Ns F av = ? N F max = ? N K i = ? J K f = ? J ∆K = ? J F v i v f F∆t = 42 Ns F av = 2.1 x 10 3 N F max = 4.2 x 10 3 N K i = 375 J K f = 60 J ∆K = - 315 J A 1.2 kg ball drops vertically onto a floor, hitting with a speed of 25 m/s. It rebounds with an initial speed of 10 m/s. (a) What impulse acts on the ball during the contact? (b) If the ball is in contact with the floor for 0.020 s, what is the magnitude of the average force on the floor from the ball?

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m = .058 kg v i = 34 m/s v f = - 34 m/s F max = ? N Figure 9-54 shows an approximate plot of force magnitude F versus time t during the collision of a 58 g Superball with a wall. The initial velocity of the ball is 34 m/s perpendicular to the wall; it rebounds directly back with approximately the same speed, also perpendicular to the wall. What is F max, the maximum magnitude of the force on the ball from the wall during the collision? F
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## This note was uploaded on 02/21/2009 for the course PHY 3425345 taught by Professor Dr.schrieber during the Spring '08 term at TCNJ.

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Chapter_9__Student_Problems - Problem 9-26 vf vi F A 1.2 kg...

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