A man weighing 370 kg runs at 5 m/s into a brick wall. Assuming he slows to a speed of zero m/s in .01 seconds, what force does the wall exert on his face?

Aray of light traveling parallel to the principal axis of a concave mirror will be reflected through the mirror's

Suppose you have three polarizing filters, with the second at an angle of 42∘ to the first and the third at an angle of 90∘ to the first. by what perfect will the original intensity of unpolarized light be reduced to after passing through all three filters?

Most of the volume of an atom is occupied by the