What provides the centripetal force needed to keep Earth in orbit?

A. inertia

B. its rotation on its axis

C. the gravitational pull of the Sun

D. the gravitational pull of the Moon

A 4000 kg elevator rises from the basement to the top of a100-m tall building. Which of the following is closest to the network done on the elevator as it rises through the middle 20m of itstrip at a constant velocity? Use g=10m/s^2. A.) 800,000 J B.

What does an electromagnet do?

In the following reaction, which substance is the precipitate? (NH4) 2SO4 (aq) + Ba (NO3) 2 (aq) BaSO4 (s) + 2NH4NO3 (aq) (NH4) 2SO4 Ba (NO3) 2 BaSO4 NH4NO3

A dog is 60 m away while moving at a constant velocity of 10 m/s towards you. Where is the dog after 4 seconds?

1. Are BEVs or hydrogen fuel cell vehicles a more promising transportation technology for the future? 2. Should car companies be required to produce electric cars?

A switch running stp is classified as a backup bridge. what state is it in

Sound waves, water waves, and light waves are all alike in that they all

What is the process in which a nucleus of an atom breaks up, emitting subatomic particles and/or energy?

If the number of particles of a gas is increased, the gas pressure will do what?

1. The sun and other stars produce visible light by a. fluorescence. b. luminescence. c. incandescence. d. electroluminescence.