Using the parallelogram method, determine the resultant vector of 150km north, 50km west

What are chlorofluorocarbons and what impact do they have on the atmosphere?

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?

In the first law of thermodynamics, triangle e=q-w, what does q stand for