Teacher made energy test honors

A 60.0 kg person walks from the ground to the roof of a 74.8 m tall building. How much gravitational potential energy does she have at the top of the building?

• 43982.4 J
• 63982.3 J
• 43962.4 J
• 83942.4 J

Tags

NGSS.HS-PS2-4

A 45 kg child on a water slide passes point A at 8.3 m/s. As the child descends from A to B, 3,600 J of heat energy is created because of friction. What is his speed at B?

• 20 m/a

• 19 m/s

• 18 m/s

• 21 m/s

Tags

NGSS.HS-PS3-1

A 22 kg child slides down a ramp. At the bottom of the 5 m high ramp, the child has a speed of 2.5 m/s. Find the energy lost due to friction (Q).

• 500.67 J

• 2541.3 J

• 2000 J

• 1009.25 J

Tags

NGSS.HS-PS3-1

NGSS.HS-PS2-1

Two opposing hockey players, one of mass 82.0 kg skating north at 6.00 m/s and the other of mass 70.0 kg skating east at 3.00 m/s, collide and become tangled.

In what direction and with what velocity do they move after collision?

• 3.5 m/s and 67 degrees, North of East

• 4.5 m/s and 69 degrees, East of North

• 5.2 m/s and 64 degrees, South of East

• 
  54.8 m/s and 62 degrees, West of East

A stationary billiard ball, mass 0.17 kg, is struck by an identical ball moving at 4.0 m/s. After the collision, the second ball moves off at 60° to the left of its original direction. The stationary ball moves off at 30° to the right of the moving ball’s original direction. What is the velocity of each ball after the collision?

• Ball 1 - 4.3 m/s at 61 degrees

  Ball 2 - 4 m/s at 33 degrees

• Ball 1 - 2.2 m/s at 35 degrees

  Ball 2 - 3.6 m/s at 60 degrees

• Ball 1 - 3.5 m/s at 30 degrees

  Ball 2 - 2 m/s at 60 degrees

• Ball 1 - 1.1 m/s at 40 degrees

  Ball 2 - 3.8 m/s at 58 degrees

A 2.5 kg rock is thrown vertically upward with an initial kinetic energy of 140 J. If 20 J of energy is lost to air resistance:

What is the maximum height the rock reaches?

What is the velocity of the rock at half of its maximum height?

What is the initial velocity of the rock?

• Max Height - 3 m

  V @ 1/2 height - 6.9 m/s

  Vi = 9 m/s

• Max Height - 5 m

  V @ 1/2 height - 6.9 m/s

  Vi = 11 m/s

• Max Height - 6 m

  V @ 1/2 height - 8.2 m/s

  Vi = 11 m/s

• Max Height - 6.2 m

  V @ 1/2 height - 4.3 m/s

  Vi = 14.1 m/s

Using the picture provided; A 20 newton block is at rest at the bottom of a frictionless incline as shown in the diagram. How much work must be done against gravity to move the block to the top of the incline?

• 80 J

• 60 J

• 100 J

• 10 J

What is the minimum power required for a conveyor to raise a 8 N box 4 meters vertically in 8 seconds?

• 260 W

• 4 W

• 64 W

• 32 W

Work is being done when a force

• of gravitational attraction acts on a person standing on the surface of the earth.

• is exerted by one team in a tug of war when there is no movement

• is exerted while pulling a wagon up a hill

• acts vertically on a cart that can only move horizontally

The graph shows the force exerted on a block as a function of the block's displacement in the direction of the force. How much work did the force do in displacing the block 5 meters?

• 20 J

• .80 J

• 0 J

• 4 J