Does the sun make gamma rays?
what gives infrared light?

Which of the choices below is one of the primary gases found in the atmosphere? a. helium b. carbon dioxide c. nitrogen d. argon

When you push downward on a book at rest on a table, you feel an upward force. does this force depend on friction? defend your answer.

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?