# HW13 - kuehner(rjk679 HW13 Mackie(20211 This print-out...

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kuehner (rjk679) – HW13 – Mackie – (20211) 1 This print-out should have 16 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points The small piston of a hydraulic lift has a cross-sectional area of 7 . 4 cm 2 and the large piston has an area of 92 cm 2 , as in the figure below. F 7 . 4 cm 2 area 92 cm 2 What force F must be applied to the small piston to maintain the load of 98 kN at a constant elevation? Answer in units of N. 002 10.0 points A hydraulic brake system is shown. The area of the piston in the master cylinder is 6 . 39 cm 2 , and the area of the piston in the brake cylinder is 1 . 76 cm 2 . The coefficient of kinetic friction between the brake shoe and the wheel drum is 0 . 408. Master cylinder Brake cylinder Brake shoe μ k = 0 . 408 Wheel drum Pedal How large is the frictional force between the brake shoe and the wheel drum when a force of 47 N is exerted on the pedal?

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