Why is gravitational potential energy negative?

What is the change in electric potential energy in moving an electron from a location 3 * 10-10 m from a proton to a location 7 * 10-10 m from the proton? The result should be in joules, with an appropriate sign.

what is the relationship between the number of turns of the wire and electrical output of the generator?

What are the Lunar Maria made of: A Basalt B Breccia C Granite D salt E Water

Which waves can travel only through solids?

Why is the air drag on a baseball different than it would be for a smooth ball with no stitches? How does this apply to the design of a golf ball?

A 2.25-kg block is released from rest on a ramp of height h. when the block is released, it slides without friction to the bottom of the ramp, and then continues across a surface that is frictionless except for a rough patch of width 15.

Which of the following are steps for balancing chemical equations? Check all that apply. ] A. Multiply the reactants to get the products. B. Change subscripts. O C.

1. Why does the water vapour in clouds condense? 2. Explain why you can see clouds but not see the water vapour in the air

What are some similarities between electricity and gravity?

What's the difference between solids and liquids?