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Q. A movie camera with a (single) lens of focal length 73 mm takes a picture of a 187 cm high person standing 30 m away. What is the height of the image of the person on the film?

Q. A spring of constant 3.00 x 10^4 N/m is between a rigid beam and the output piston of a hydraulic lever. An empty container with negligible mass sits on the input piston. The input piston has Areai and the output piston has area 18.0A. Initially the spring is at its rest length. How many kilograms of sand must be poured slowly into the container to compress the spring by 5.00cm?

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