What does WA mean in Friction?

why do signs at petrol stations warn people not to use cell phones while filling the petrol in their cars?

A ball on an extremely low-friction, tilted surface will slide downhill without rotating. If the surface is rough, however, the ball will roll. Explain.

Which of the following is a result of reduced levels of red blood cells and elevated levels of white blood cells in the body?

What is the period of a 4.12 m long pendulum?

One reason it's often easy to miss and action reaction pair is because of?

A runner with a mass of 75kg runs 6m/s calculate the kinetic energy stored in the runner

Watt which is a unit of power is equal to

A certain wave has a wavelength of 35 meters and a frequency of 4.0hz. What is the speed of the wave

What is the Force in Newtons exerted by an object with a mass of 15 kg and an Acceleration of 12 m/s2?

A large metallic sphere insulated from ground is charged with an electrostatic generator while a person standing on an insulating stool holds the sphere. why is it safe to do this?