Work
During the Powerhouse lab, Jerome runs up the stairs, elevating his 102 kg body a vertical distance of 2.29 meters in a time of 1.32 seconds at a constant speed. Determine the Work he did when climbing up the stairs.
2.30x10^3 J
A 4.0x10^3-Watt motor applies a force of 8.0x10^2-Newtons to move a boat at constant speed. How far doe it move in 16 seconds?
80m
If the speed of a moving object is doubled, the kinetic energy of the object is______?
quadrupled
remains the same
a 5N force causes a spring to stretch .2m. What is the potential energy stored in the stretched spring?
.5J
What combination of units can be used to express work?
newton x meter
107.143W
A 1000kg car that travels 60m/s can brake to a stop within a distance of 20m. What is the work (KE) done on the car?
1,800,000J
A 79kg skier starts off from rest at the top of the hill with a height of 9m. How much PEg does he have at the top?
7,110J
A spring has a spring constant of 120 Newtons per meter. How much potential energy is stored in the spring as it is stretched .20 meter?
2.4J
How much work is done if you push with a force of 200 N against a wall for 10s?
None because the wall is not moving
what is the power of someone who is doing 73J of work in 16 seconds?
4.56W
If a 1kg football is thrown with a speed of 10m/s, what is the KE of the football?
50J
Sophia dropped a .1kg bag off the top of a 100m building. at 68m, what is the PEg of the bag?
68J
It takes a force of 20 Newtons to hold a spring stretched to a distance of 40 cm. What is the elastic potential energy of the spring at this position?
4J
A constant force of 2100 Newtons is required to keep a car having a mass of 400kg moving. If the car moves 80 meters horizontally in 3 minutes and has an 85N frictional force acting on it, how much total work is done on it?
161,200J
What is the maximum amount of work that a 6000watt motor can do in 10 seconds?
6.0x10^4 J
A student rides a bicycle up a 30° hill at a constant speed of 6.00 m/s. The combined mass of the student and bicycle is 70kg. What is the kinetic energy of the student-bicycle system during this ride?
1,260J
The potential energy stored in a compressed spring is to the change in the spring's length as the kinetic energy of a moving body is to the body's __________.
speed
How much work is done in lifting a 10kg free weight a vertical distance of .5 meters at a constant velocity?
50J
What is the power of a man who pushes a box 8m with a force of 15N in 6s?
20W
An average force of 20 Newtons is used to pull back the string of a bow .6m. As the arrow leaves the bow, its kinetic energy is_____?
12J
What is the relationship between gravitational potential energy and height
Direct
.068J