In fig. 7-30, a block of ice slides down a frictionless ramp at angle 50 while an ice worker pulls on the block (via a rope) with a force that has a magnitude of 50 n and is directed up the ramp. as the block slides through distance d 0.50 m along the ramp, its kinetic energy increases by 80 j. how much greater would its kinetic energy have been if the rope had not been attached to the block?

It Is 25J greater.

Explanation:

Applying the Energy conservation theorem, we have:

The Work done by the ice worker is given by:

The angle is 180 degrees because the force exerted by the worker is opposite to the motion.

If the rope was not there, the external work is 0, so:

The kinetic energy is 25J greater without the rope.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.