Answer plzzz dan does 188.0 j of work raking leaves. if the rake does 128.0 j of work, what is the efficiency of the rake? a. 68.1 percent b. 147.0 percent c. 60.0 percent d. 316.0 percent a force of 29.0 n is used to lift a baby through a distance of 0.500 m. how much work is done on the baby? a. 29.5 j b. 58.0 j c. 14.5 j d. 28.5 j

What object a collides with object b and bounces back its final momentum is?

If anyone who can me with this hw? i would really appreciate it

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.