"a bridge, constructed of 11 beams of equal length l and negligible mass, supports an object of mass m.
throughout this problem, use g for the magnitude of the acceleration due to gravity.
find f_p, the vertical force that pier p exerts on the left end of the bridge.

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The solar panels used by mark function because of the photoelectric effect. light shines on the cells causing electrons to be ejected from the metal, which produces an electric current. at night on mars, no light will fall on the solar cells and no electric current will be generated. according to your notes, what type of light is typically needed to cause the photoelectric effect? a)visible b)ultraviolet c)infrared

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?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.