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A truck is moving with constant acceleration a up a hill that makes an angle phi with the horizontal as in the figure below. A

A truck is moving with constant acceleration a up a hill that makes an angle phi with the horizontal as in the figure below. A small sphere of mass m is suspended from the ceiling of the truck by a light cord. If the pendulum makes a constant angle ? with the perpendicular to the ceiling, what is a? (Use any variable or symbol stated above along with the following as necessary: g.)

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