MiniDrillHomework 1

1
Mini-Drill/Homework (1)

• Problem 3, part (c) page 177 Calculate the
  magnitude of the linear momentum of a 75.0 kg
  sprinter running with a speed of 10 m/s.

2
Solution (1)

• Problem 3, part (c) page 177 Calculate the
  magnitude of the linear momentum of a 75.0 kg
  sprinter running with a speed of 10 m/s.

3
Mini-Drill/Homework (2)

• A 2.4-kg ball falling vertically hits the floor
  with a speed of 2.5 m/s and stops. What is the
  change in momentum of the ball?

4
Solution (2)
y
x
5
Mini-Drill/Homework (3)

• Problem 61, page 150 modified A 75 kg man steps
  out a window and falls (from rest) 1.0 m to a
  sidewalk. If the man stops in approximately 0.05
  s, calculate the average force exerted on him by
  the ground.

6
Solution (3)
Use conservation of energy to find vnet,i
vfall,f
7
Solution (3)
8
Solution (3)
9
Mini-Drill/Homework (4)

• Calculate the change in momentum for a water
  balloon dropped from a height of 20 m.

10
Mini-Drill/Homework (5)

• If you were floating in outer space, then how
  fast would you need to throw a 1.0 kg object in
  order to obtain a velocity of 2.0 m/s?

11
Solution
y
x
12
Mini-Drill/Homework (6)

• Problem 27, page 179 A railroad car of mass 2.00
  104 kg moving at 3.00 m/s collides and couples
  with two coupled railroad cars, each of the same
  mass as the single car and moving in the same
  direction at 1.20 m/s. What is the speed of the
  three coupled cars after the collision?

13
Solution (6)