Which of these is a contact force?

A. earth's attraction of the moon

B. force of a magnet that attracts paper clips

C. force of a bat on a baseball

Why do electromagnetic waves not require a medium for travel? A) because electromagnetic waves travel too fast for stationary particles to move with them B) because electromagnetic waves transmit energy without compressing the particles of the

The deep impact mission released an impactor into the comet Tempel 1. What result did the probe reveal?

A 3.0 kg mass moving to the right at 1.4 m/s collides in a perfectly inelastic collision with a 2.0 kg mass initially at rest. what will the velocity of the combined mass be after the collision? show your work.

An automobile having a mass of 480 kg is driven into a brick wall in a safety test. The bumper behaves like a spring of constant 6.49 * 106 N/m and compresses 4.62 cm as the car is brought to rest.

What separates the crust to the mantle?

Which statement about how light travels is true? A Light waves need a medium to travel, and they travel at the same speed even if the light source is moving.

Explain why the car reaches a top speed even though the thrust Force remains constant at 3500N

4. A helicopter is flying at a height of 1.5km. If it has 50MJ of G. P. E., what is the mass of the helicopter?

Unless otherwise posted, what is the speed limit in a school zone? florida

If you put in 10 J of work to push 1 c of charge against and electric field what will be its voltage with respect to its starting position? when released, what will be it's kinetic energy if it flies past it's starting position?