Chapter 6

1
Chapter 6 part C

• Power

2
Exercise 6.36

• 36. A skier of mass 70.0 kg is pulled up a slope
  by a motor-driven cable. (a) How much work is
  required to pull the skier a distance of 60.0 m
  up a 30.0 slope (assumed frictionless) at a
  constant speed of 2.00 m/s? (b) A motor of what
  power is required to perform this task?

3
Exercise 6.55

• 55. The ball launcher in a classic pinball
  machine has a spring that has a force constant of
  1.20 N/cm. The surface on which the ball moves is
  inclined 10.0 with respect to the horizontal.
  The spring is initially compressed 5.00 cm. Find
  the launching speed of a 100-g ball when the
  plunger is released. Friction and the mass of the
  plunger are negligible.

4
Exercise 6.52

• 52. A particle is attached between two identical
  springs on a horizontal frictionless table. Both
  springs have spring constant k and are initially
  unstressed. (a) The particle is pulled a distance
  x along a direction perpendicular to the initial
  configuration of the springs. Show that the force
  exerted by the springs on the particle is
• (b) Determine the amount of work done by this
  force in moving the particle from x A to x 0.

5

• Review problem. A particle of mass 0.500 kg is
  shot from P as shown in Figure P7.6. The particle
  has an initial velocity with a horizontal
  component of 30.0 m/s. The particle rises to a
  maximum height of 20.0 m above P. Determine (a)
  the vertical component of , (b) the work done
  by the gravitational force on the particle during
  its motion from P to B, and (c) the horizontal
  and the vertical components of the velocity
  vector when the particle reaches B.