What provides the centripetal force needed to keep Earth in orbit?

When you sit still in a chair with your feet on the ground and your back pressing against the back of the chair, are the forces acting on you balanced? Explain.

What is the speed of a car at rest?

Which quantity Has the same unit as potential difference

What is the final velocity of a hoop that rolls without slipping down a 5.00-m-high hill, starting from rest?

When you ride a roller coaster that makes sharp turns, you feel yourself being pushed to one side. Use Newton's first law of motion to explain this phenomenon

A stationary speed gun emits a microwave beam at 2.10*10^10Hz. It reflects off a car and returns 1030 Hz higher. What is the speed of the car?

Discuss the changes in potential energy and kinetic energy and total energy for skateboarder going up and down on a half pipe ramp

The diagram below shows rock is affected when water enters cracks in rock, freezes and becomes ice

A vertical piston-cylinder device contains a gas at a pressure of 100 kPa. The piston has a mass of 5 kg and a diameter of 12 cm. Pressure of the gas is to be increased by placing some weights on the piston.

Evaluate the force of a skateboard exerts on you if your mass is 60kg and you push on the skateboard with a force of 60N