Physics 011

Quiz#7

 Chapter 7 Practice Problems

 1

A ball with a mass of .2 kg travelling at a speed of m/s is struck by a bat. If the duration of the impulse is .001 seconds and the speed of the ball afterwards is the same as before, what is the average force (to the nearest Newton) of the impact?

 2

On the other hand, if the magnitude of the average force in problem 1 is 20000 N, what is the speed to the nearest m/s after collision?

 3

A kg clay ball travelling left to right at a speed of 10 m/s strikes and sticks to a 5 kg ball at rest. What is the total momentum, to the nearest single decimal place of the composite ball after collision?

 4

In problem 3), to 2 decimal places, what is the fractional loss of Kinetic Energy?

 5

Four Masses are arranged in a square one meter on a side as follows: (clockwise from the upper left hand corner) 8 kg , kg , 10 kg , 3 kg . Assume that the 3 kg mass at the lower left hand corner is at x=0 and y=0. What is the x location, to the nearest cm, of the center of mass?

 6

What is the y location, to the nearest cm, of the center of mass?

 7

A kg steel ball, travelling left to right at 12 m/s, undergoes an elastic collision with a 5 kg steel ball at rest. To the nearest Joule, what is the Total Kinetic Energy of the two balls after collision?

 8

To the nearest Joule, what is the Kinetic Energy of first ball in problem 7) before collision?

 9

If the first ball in problem 7) has a mass of 10 kg and the second ball is travelling at it with a speed of m/s, what is the velocity, to one decimal place, of the first ball after collision?

 10

What is the velocity of the second ball in problem 9) to one decimal place?