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When a book falls from a shelf to the ground without anyone pushing on it, no work is done on the book. true or false

Unpolarized light of intensity so passes through two sheets of polarizing material whose transmission axes make an angle of 60∘ with each other as shown in the figure. what is the intensity of the transmitted beam, st?

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?