Calculate the approximate radius of the 31p nucleus (assume r0 = 1.3x10-15 m).

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?

The substances that are necessary for producing of certain hormones and that store and transport vitamins

If the work required to stretch a spring 3 ft beyond its natural length is 15 ft-lb, how much work is needed to stretch it 27 in. beyond its natural length?