I) Friction depends
on the
of surface.

Why does the input force have to be greater than the force needed to lift the bale?

Light from the sun reaches the earth in 8.3 minutes. the velocity is 3.00 x 10^8 m/s. how far is earth from the sun? i know how to get to d = (3 x 10^8 m/s)(498 sec). i just don't know how to get from there to the answer being 1.5 x 10^11 m.

Which lists the organs in the correct order as food passes from the mouth to anus?