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Lesson: Dynamics Problems

Worksheet: Dynamics Problems • 17 Questions

Q1:

A constant 10-N horizontal force is applied to a 20-kg cart at rest on a level floor. If friction is negligible, what is the speed of the cart when it has been pushed 8.0 m?

Q2:

A 4.0-kg particle moving along the -axis is acted upon by the force whose functional form appears in the figure. The velocity of the particle at is .

Find the particle’s speed at .

Find the particle’s speed at .

Find the particle’s speed at .

Q3:

A shot-putter throws a shot of mass 7.26 kg a horizontal distance of 22.2 m.

The shot is released from the shot-putter’s hand 2.20 m vertically above the ground and at an angle above the horizontal. What is the initial speed of the shot?

While in the shot-putter’s hand, the shot is accelerated uniformly over a 1.20 m distance. What net force acted on the shot to accelerate it?

Q4:

A 2.50-kg fireworks shell is fired straight up from a mortar and reaches a height of 110 m above the muzzle of the mortar.

Neglecting air resistance, calculate the shell’s velocity when it leaves the mortar.

The mortar itself is a tube 0.450 m long. Calculate the magnitude of the average acceleration of the shell in the tube as it goes from zero to the velocity at which it leaves the mortar.

  • A m/s2
  • B m/s2
  • C m/s2
  • D m/s2
  • E m/s2

What is the magnitude of the average force on the shell in the mortar?

  • A N
  • B N
  • C N
  • D N
  • E N

Q5:

A rocket sled accelerates at a rate of 49.0 m/s2. Its passenger has a mass of 75.0 kg.

Calculate the horizontal component of the force the seat exerts against his body.

  • A N
  • B N
  • C N
  • D N
  • E N

Find the ratio of the magnitude of the horizontal component with the passenger’s weight.

Calculate the angle from the horizontal of the total force the seat exerts against his body.

Calculate the magnitude of the total force the seat exerts against his body.

  • A N
  • B N
  • C N
  • D N
  • E N
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