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The total energy of a 2.00 kg falling rock is 5000J. if the PE is 1975J what is the kinetic energy?
Wiki User
∙ 13y ago
You can assume for this problem that "total energy" refers to "total mechanical energy", i.e., potential energy + kinetic energy.
Wiki User
∙ 13y ago
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What should be the height of the building when a 20 kg objectdropped fromthe top of the building possesses 5000j of energy at the time of fall?
When you say "time of fall", I'm going to assume you mean "time of hitting the ground".The kinetic energy it has when it hits the ground is exactly the potential energyit had on the roof. (As is our tradition, we're ignoring air resistance.)Potential energy = (mass) x (gravity) x (height)5,000 = (20) x (9.8) x (Height)Height = 5,000 / (20 x 9.8) = 25.51 meters
How much power would a person use to move a piano 10 meters in seconds using a force of 100 newtons?
A force of 100 newtons acting through a distance of 10 metersresults in 1,000 joules of energy transferred.If it all takes place in 10 seconds then the average rate of energytransfer (power) during that interval is(1,000/10) = 100 joules per second = 100 watts.
What should be the height of the building when a 20 kg objectdropped fromthe top of the building possesses 5000j of energy at the time of fall?
When you say "time of fall", I'm going to assume you mean "time of hitting the ground".The kinetic energy it has when it hits the ground is exactly the potential energyit had on the roof. (As is our tradition, we're ignoring air resistance.)Potential energy = (mass) x (gravity) x (height)5,000 = (20) x (9.8) x (Height)Height = 5,000 / (20 x 9.8) = 25.51 meters
A crane does 5000J of work to lift a box a vertical distance of 16.0 m Calculate the mass of the box?
Force on the box = (weight) = (mass) x (gravity)Work = (force) x (distance) = (mass x gravity) x (distance)Mass = (work) / (gravity x distance)= (5000) / (9.8 x 16) = 31.888 kg (rounded)
How much power would a person use to move a piano 10 meters in seconds using a force of 100 newtons?
A force of 100 newtons acting through a distance of 10 metersresults in 1,000 joules of energy transferred.If it all takes place in 10 seconds then the average rate of energytransfer (power) during that interval is(1,000/10) = 100 joules per second = 100 watts.
