a 7000 n cr is raised using a hydraulic lift, which consists of a u tube with arms of unequal areas filled with incompressible oil and capped at both ends with tight fitting pistons. the wider arm of the u tube has a radius of 15 cm and the narrower arm has a radius of 7 cm. the car rests n the piston on the wider arm of the u tube. the pistons are initially at the same level. what is the initial force that must be applied to the smaller piston in order to start lifting the car?

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