Which of the following is an example of a contact force? A magnet repelling another magnet without touching it A ball falling the ground when it is dropped A child pushing a toy car Gravity keeping the earth in order around the sun

What in the atmosphere hold in the amount of heat needed to keep earth livable

A double-paned window has two glass panes separated by a layer of air. Why is air, rather than glass, used to fill this space?

Jenny and Fred both play a long note on their trombones. A stationary observer hears the sound increasing and decreasing repeatedly in loudness. Which of these must be true? A.

What is the asthenosphere made out of? a. Solid Rock b. Liquid Rock c. Liquid Iron d. Solid Iron

A car accelerates from rest to 19 m/s in 6 seconds. What is the acceleration of the car?

How does kinetic energy connect or relate to Newtons second law of motion?

In the United States, the electricity generated by hydropower is about a. twice that generated by solar and geothermal. b. equal to that generated using wind technologies. c. twice as much as that generated by wind, solar, and geothermal. d.

An ac generator consists of a coil with 40 turns of wire, each with an area of 0.06 m2. The coil rotates in a uniform magnetic field B = 0.4 T at a constant frequency of 55Hz. What is the maximum induced emf?

The diagram shows the directions of the earth's rotation and the moon's orbit around the earth. Which of these phenomena occurs on earth because of this?

Which layer of the atmosphere is made up of charged atoms?