41. What effects the efficiency of a pulley? a. the type of rope or cable

b. the way the wheel turns

c. the length of the rope

d. how big the wheel is

e. only a and be

f. all of the above

Which device uses ac current to operate?

If a stone with an original velocity of 0 is falling from a ledgeand takes 8 seconds to hoybthe ground whays the final velocity of the stone

Cathy is pedaling down a steep hill on her bicycle and wants to be able to coast up the next hill, which is 25 meters high, without pedaling. cathy and her bicycle have a mass of 75 kg. assuming her bicycle is 100% efficient, what would her speed have to be?