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A hydraulic brake system is shown. The area of the piston in the master cylinder is 6.36 cm , and the area of the piston in the brake cylinder is 1.81 cm . The coefficient of kinetic friction between the brake shoe and the wheel drum is 0.416. Wheel drum Pedal Brake shoe Brake cylinder Master cylinder Uk = 0.416 How large is the frictional force between the brake shoe and the wheel drum when a force of 48 N is exerted on the pedal? Answer in units of NPiston 1 in the figure has a diameter of 0.24 in and is attached to a lever arm a distance 2 in from the pivot point. Piston 2 has a diameter of 1.6 in. An external force F acts on the lever arm at a distance 20 in from piston 1 as shown below. 465 1b 2 in 20 in 2 1 F In the absence of friction, find the forceA Ping-Pong ball with mass 3.5 g is attached by a thread to the bottom of a beaker. When the beaker is filled with water so that the ball is totally submerged, the tension in the thread is 0.026 N . 3.5 g