Why is electric switches and boards are made up of plastic

Lee pushes horizontal with a force of 79 N on a 34Kg mass for 10 m across a floor. Calculate the amount of work lee did

A battery of voltage V delivers power P to a resistor of resistance R connected to it. By what factor will the power delivered to the resistor change if the following changes are made? Give your answers as a factor of the original power P.

Determine the maximum weight of the bucket that the wire system can support so that no single wire develops a tension exceeding 100 lb.

A boy that has a mass of 40 kilograms is walking at a speed of 2m/s. What is the boys momentum?

If you shook the end of a rope up and down 6 times each second, what would be the period of the waves set up in the rope?

Whats an example of projectile motion

The fact that the sun rises and sets at different times during the day depending on the time of year is an example of a data trend. True or False

What sample of matter is a single substance

What is a hydraulic machine and what is its purpose? Explain how a simple hydraulic machine performs work.

Is the muzzle velocity a scalar or vector quantity?