Percy pulls on a rope that is held up by a pulley, like the one shown. the pulley is near the ceiling, and the other end of the rope is attached to a crate. percy applies 75 n of force to the rope, and the rope lifts the crate by applying a force of 75 n.

what is the mechanical advantage of the machine?
a. 0
b. 1
c. 150
d. 5625

Your 249 ml cup of coffee is too hot to drink when served at 82 degree celsius. what is the mass of an ice cube taken from a -21 degree celsius freezer, that will cool your coffee to a pleasant 54 degree celsius. specific heat of the water is 4190 j/kg c, specific heat of ice is 2090 j/kg c, heat of fusion of ice is 3.33 x 10^5 j/kg

Ahydroelectric plant takes energy from water and turns it into electrical energy. what are the transformations of energy in the water molecules that are used in the process of generating electricity this way?

With i really need the correct answer!