Using the periodic table, explain the difference between hydrogen, deuterium, and tritium-I. e. hydrogen-1 and hydrogen-3

Which simple machine is not part of this compound machine? a. lever b. pulley c. inclined plane d. wheel and axle

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?

Apulley with mass mp and a radius rp is attached to the ceiling, in a gravity field of 9.81 m/s2 and rotates with no friction about its pivot.