How do you find input energy with only the efficiency and output energy given?

What is the frequency if a wave that pases a given pount 22 times in 2 seconds

what are the various ways in which lithospheric plates interact with each other as they move around on a dynamic earth?

A student lifts a 90 pound (lb) ball 4 feet (ft) in 5 seconds (s). How many joules of work has the student completed? A) 770J B) 369J C) 488 ft lbs D) 488.6 J

How will frost on the wings of an airplane affect takeoff performance?

Does Iron repel or attract the South Pole of a magnet?

A British newspaper was interested in whether groups of people who differed in social standing were treated differently when they complained to organizations about poor service they had received.

During combustion, a fuel's electromagnetic energy is converted into thermal energy.

Explain why glucose is important to a cell

4. How far does a car travel in 90 seconds if it is traveling at a speed of 55 m/s?

Total energy input is 1400 and my efficiency is 80% so what is the useful energy output in jules?