polly is pushing a box across the floor with a force of 30 N. The force of gravity is -8N, and the normal is 8N. Which value could describe the force of friction if Polly could not move the box?

The star betelgeuse is about 600 light-years away. if it explodes tonight, a. we'll know because debris from the explosion will rain down on us from space. b. we'll know it immediately because it will be brighter than the full moon in the sky. c. we won't know about it until 600 years from now. d. none of the above.