What is the input of energy for a device that provides 50 units of useful energy and has an efficiency of 0.55?

Work out sian speed for the first 30 minutes of her journey. give your answer in km/h.

Acar jack with a mechanical advantage of 6 needs to produce an output force of 600 n to raise a car. what input force is required? 6 n 100 n 600 n 3,600 n

Does the distance travelled by an oscillating mass between times t=0 and t2 equal the displacement of the particle over the same time period if t2> t/2? hint: consider a sine wave starting at t1=0, then consider a closing wave starting at t1=0, for your explanation.