A 160-lb person burns about 2900 calories to run a marathon. how much energy is burned in kj? assume two significant figures.

What is force the product of? 1. newtons and weight 2. position and mass 3. mass and acceleration 4. newtons and gravity

How is an electromagnet different from a bar magnet? A) Bar magnets have a north and south pole, but electromagnets do not. Eliminate B) Electromagnets are strong, permanent magnets, but bar magnets are always weaker.

Which of the following force fields will deflect electron beams? Magnetic Electrical Gravitational

An electric motor moves a chain that pulls the roller coaster car 180 meters to the top of the first hill. The chain exerts a force of 2,524 newtons on the car.

Which type of radiation detection device uses a phosphor-coated surface to detect radiation?

The portion of a light ray that falls on a surface is a/an

Give the definition for diffusion. (A) gas molecules mix unequally average distance between collisions (B) gas molecules escape from a container into a vacuum through a small hole (C) gas molecules mix equally (D) gas molecules spread out in a

As resistance goes up, what happens to the current?

1. A 0.828-nm photon collides with a stationary electron. After the collision, the electron moves forward and the photon recoils backwards. a) Find the momentum of the electron. b) Find the kinetic energy of the electron.

When are you most aware of your motion in a moving vehicle: when it is moving steadily in a straight line or when it is accelerating?