Question: jimmy has two options for moving a piano up to the second floor of a hotel, which is 10 m above his current position. he can push the piano up 50 m ramp or lift the piano up with a rope wrapped around a pulley. which option will require him to exert a greater average force? neglecting friction, which option will require more work?

Lifting straight up, even with a rope and pulley, always takes more force than going up a slanted ramp to the same height.

But if you use the ramp, then you have to exert the force over a greater distance (pull more rope to lift to the same height).

Astonishingly, the product of (force) x (distance) is the same number either way.  So without friction, the total amount of work required is the SAME whichever way the piano is lifted.

answer: hey stupid

what the hell you doing i need you at my house

explanation: it's me king omoregie

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.