Physics, 05.05.2020 16:32 leahstubbs
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A 200kg piano sitting on a platform 2 m high has 3920 J off potential energy. It required 4500 J of work to push the piano up a ramp to the platform. What is the best explanation for the difference between the amount of work required to move the piano and its potential energy?
A) the piano lost mass as it was pushed up the ramp.
B) energy was destroyed moving the piano up the ramp.
C) some of the energy required to push the piano up the ramp was used to overcome friction between the piano and the ramp.
D) the work required to push the piano up a ramp is greater because the force is the same as if it were lifted, but the distance is greater when using a ramp.
Answers: 2
Physics, 21.06.2019 23:30
Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.
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A 200kg piano sitting on a platform 2 m high has 3920 J off potential ener...
A 200kg piano sitting on a platform 2 m high has 3920 J off potential ener...
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