A70kg box is slid along the floor by a 400n force. the coefficient of friction between the box and the floor is 0.5 when the box is sliding. find the acceleration of the box

What are similarities and differences of reflection, refraction, diffraction and absorption?

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.

Apropagating wave in space with electric and magnetic components. these components oscillate at right angles to each other. it may travel in a vacuum. determine the term.