Show all your work for each answer! 1) You lift a 20 kg box 1.5 meters off the g

Question

Show all your work for each answer!

1) You lift a 20 kg box 1.5 meters off the ground onto a shelf, you do 300 J of work, how much gravitational

potential energy does the crate have sitting on the shelf relative to the ground?

2) Jack pulls a box across the floor with a horizontal force, the box moves at a constant velocity, a frictional

force is acting on the box for 10 m and Jack uses 300 J of energy in pulling the box over that 10 m, what was

the frictional force on the box?

3) How much work is required to push a box (mbox = 2 kg) up an incline at a constant speed to a height of 5 m,

if the ramp is 10 m long?

4) You pull your luggage (mluggage = 6 kg) 500 m across an airport terminal you apply a force of 8 N at an angle

of 40

You lift a 20 kg box 1.5 meters off the ground onto a shelf, you do 300 J of work, how much gravitational potential energy does the crate have sitting on the shelf relative to the ground? Jack pulls a box across the floor with a horizontal force, the box moves at a constant velocity, a frictional force is acting on the box for 10 m and Jack uses 300 J of energy in pulling the box over that 10 m, what was the frictional force on the box? How much work is required to push a box (mbox = 2 kg) up an incline at a constant speed to a height of 5 m, if the ramp is 10 m long? 4) You pull your luggage (m luggage = 6 kg) 500 m across an airport terminal you apply a force of 8 N at an angle of 40 degree relative to the horizontal, how much work have you done in moving your luggage?

Explanation / Answer

1)P.E=mgh=work done=300 J

B)W=F.S=300...

frictional force f=300/10=30 N


C)W=(1/2)m*v^2=mgh=98 J...

D) W=F*S*cos?=8*500*cos(40)=3064.18 J

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