Work and Power
How much work is produced if you push a 5kg box 5m with a force of 3N
15 J
How much Kinetic energy does an object posses if it isn't moving?
None.
How much potential energy does a tennis ball on the ground posses?
None.
If a spring with a spring constant of 2 N/m, is compressed .05m, how much PE does it have?
.0025 J
How much work is produced if the change in kinetic energy is 5 J?
5J
How much power is produced by a dozer if it conducts 200 J of work in 2 seconds?
100 watts
How much kinetic energy does a 17kg dog posses if runs 12m/s?
1224 J
How much PE does a 1kg ball have if it is resting 5m off of the ground?
49 J
If a bow has a spring constant of 3N/m, how far back is it drawn in order to obtain 5J of PE?
1.82 m
a 5kg ball's velocity decreases from 7m/s to 0m/s, what is the work done by friction?
- 122.5 J
How much work is produced if you lift a 10kg box 10m in 2 seconds starting from rest?
981 J
A ball traveling 10m/s has 45J of KE, what is it's mass?
.9 kg
If a 2kg book posses 50J of PE, how high is it off of the ground?
2.55 m
If a .5m spring with a spring constant of 7N/m is compressed by .375m, how much potential energy does it have?
.05 J
+6000 J of work done by gravity causes a monkey to resting in a tree to hit the ground 100m down in 2 seconds, what is the mass of the monkey?
6.12 kg
How much power do you produce if a 100N force causes a ball to roll 12m/s?
1200 W
A 3000kg truck has 6000 J of KE, what is it's velocity?
2m/s.
If an objects posses 50000J of PE and is 1200m off of the ground, what is the mass of the object?
4.25 kg
If a 45N force compresses a spring to .25m, what is the spring constant of the spring?
180 N/m
When 150 joules of work is done on a system by an external force of 15 newtons in 20. seconds, by how much does the total energy of that system increases by ?
150J
How much power do you produce if you pull a cart with 12N of force for 9m in 3 seconds? (The angle of pull is 45 degrees)
25.46 J
A .2kg book travels 12m from rest in 18 seconds, how much kinetic energy does it posses?
.04 J
If an object posses 1000J of PE and has a mass of 25kg, what height is it located at?
4.08 cm
A 2m long spring with a spring constant of 10N/m and is compressed to .5m, what is the PE?
11.25 J
A motor does 20. joules of work on a block, accelerating the block vertically upward. Neglecting friction, if the gravitational potential energy of the block increases by 15 joules, its kinetic energy
(1) decreases by 5 J (3) decreases by 35 J
(2) increases by 5 J (4) increases by 35 J
2- increases by 5J