A student swings his keychain around in a circle. What is the source of the centripetal force for this action?

What makes it difficult for a vehicle's driver to judge a motorcycle's speed and distance? The size of the motorcycle The size of the motorcycle rider The size of the vehicle The position of the motorcycle on the road

A kitten pushes a ball of yarn rolling toward it at 1.00 cm/s with its nose, displacing the ball of yarn 17.5 cm in the opposite direction in 2.00 s. What is the acceleration of the ball of yarn?

two current carrying wires are placed next to each other. Their currents are moving in the same direction. Suggest why each wire experiences a force

Calculate how long it eould take a car to travel 1600 m at an average speed of 26.4m/s

How will you describe the magnetic field around a current-carrying coil? a. the magnetic field is weakest near and around the coilb) the magnetic field vary directly with the distance from the coilc) the magnetic field is strongest inside the

a submarine moving directly upward in the water at constant speed. The weight of the summer and it is 500,000 N. The submarines motors are off. The magnitude of the buoyant force acting on the submarine is

If the car went 30 km west in 25 min. and then 40 km east in 35 min., what would be its total displacement?

Which of the following is not the name of a space station that was in orbit around Earth?

Relationship between acceleration and free fall

A SI unit used to measure force, equal to less than one-quarter of a pound, is the what