Hi, i'm new here! i need , i will give points! a force of 13 n is applied to the handle of a screwdriver being used to pry off the lid of a
paint can. as the input force moves through a distance of 0.25 m, the screwdriver does 2
j of work on the lid. what is the efficiency of the screwdriver? show your work.

you pull the rope of a pulley 8 meters to lift the box on the other end a distance of 2
meters. what is the ideal mechanical advantage of the pulley system? show your work.

a pot of water has a mass of 950g. the specific heat of water is 4.18 j/kg•℃. how much
heat must be absorbed to raise the temperature of the water from 28℃ to 85℃? show
your work.