Which statement best describes the difference between an insulator and a coductor

What is the effeciency of the machine that has an input of 120 and an output of 96?

Two solid spheres of radius R made of the same type of steel are placed in contact. The magnitude of the gravitational force they exert on each other is F1.

The red sphere represents a proton. What is the atomic number of this atom

How does the buoyant force affect a submerged object

A 4.0-kg ball has a momentum of 20.0 kg-m/s. What is the ball's speed?

A 70 kg boy is sitting 3 m from the ground in a tree. what is his gravitational potential energy

Which of the following describes the flow of charges through a wire or a conductor?

What is the kinetic energy of a 2 kg snowball thrown through the air at 5 m/s?

A 5.00*105-kg subway train is brought to a stop from a speed of 0.500 m/s in 0.400 m by a large spring bumper at the end of its track. what is the force constant k of the spring

A moving object always has energy in its?