Published using Google Docs
Ch 7 Review
Updated automatically every 5 minutes

Physics

Chapter 7 Review

  1. A deer hunter sits 4.00 m off the ground, in a tree.  He fires a gun with a horizontal velocity of 600. m/s.  The bullet strikes a deer in its chest 0.75 m off the ground.  What is the horizontal distance between the hunter and the deer?

  1. A motorcycle stunt person attempts to jump over a 200. m wide canyon.  He leaves one side with a velocity of 43.0 m/s at an angle of 40.0°.  Assuming he needs to land at the same vertical height with which he left the other side, will he make it?  Support your answer with the appropriate calculations.

  1. Elliot throws a water balloon at a speed of 10.0 m/s and an angle of 53.1°.  A car is coming towards him at 5.00 m/s.  If Elliot wants to hit the car with the water balloon, he needs to throw the water balloon when the car is how far away?  (Assume the balloon will hit the car at the same height from which it was thrown.)

  1. A 0.500 kg stone stuck in car tire, with a radius of 0.400m, rotates 10.0 revolutions per second.

  1. What is the velocity of the stone?
  2. What is the centripetal acceleration of the stone?
  3. What is the centripetal force acting on the stone?

  1. A 30.0 kg child sits on a merry-go-round 2.00 m from the center.  The merry-go-round rotates at a rate of 0.75 seconds/revolution.  What is the minimum coefficient of friction necessary to keep the child from slipping?  (Assume the child does not hold on with their hands.)

  1. What is the period of a 20.0 cm long pendulum on Earth?

  1. What is the length of a pendulum that has a period of 0.500 seconds on Earth?

  1. If a 1.00 m long pendulum has a frequency of 0.400 Hz on Planet X, what is the acceleration due to gravity on that planet?

  1. A meter stick has a fulcrum at the 60.0 cm mark.  A 700.0 g mass is suspended at the 45.0 cm mark and a 150.0 g mass is suspended at the 10.0 cm mark.  Where should a 450.0 g mass be suspended to keep the meter stick balanced?

  1. If you push on a door with 300.0 N of force 0.750 m from its hinges, how much torque do you produce?

1.) 489 m        2.) No, he misses by 15.0 m        3.) 17.9 m        4.) a. 25.1 m/s;  b. 1580 m/s2;  c. 788 N  5.) 14.3        6.) 0.898 s        7.) 0.0621 m        8.) 6.32 m/s2         9.) 100. cm        10.) 225 Nm