PLEASE HELP ASAP describe how the equations for gravitational force and electrostatic force are similar

Efficiency is the ratio of to for a system a)power in to power in b)power in to power out c) power out to power out d) power out to power in

What does every magnet possess? a. iron metal b.strong magnetic field c.repulsion d.north and south poles

Water flows through a garden hose which is attached to a nozzle. the water flows through hose with a speed of 2.19 m/s and through the nozzle with a speed of 19.8 m/s. calculate the maximum height (in m) to which water could be squirted if it emerges from the nozzle and emerges with the nozzle removed.