Amotor-car has a hydraulic brake system. when the brake is applied, a circular piston of radius 6.0mm (in the master cylinder) exerts a force of 100.0n on the brake fluid. what force is applied to a wheel's brake shoe if the surface over which it is applied (at the wheel cylinder) is a circle of radius 30.0mm?

How would doubling the made of an object change the objects potential energy

(**i would really appreciate if this was answered soon** ) which pair of quantities includes one quantity that increases as the other decreases during simple harmonic motion?

Water is siphoned from a large tank and discharges into the atmosphere through a 50-mm diameter tube. the end of the tube is b = 2.1 m below the tank bottom which is a = 7.4 m deep, and viscous effects are negligible. determine the maximum height h over which the water can be siphoned without cavitation occurring. atmospheric pressure is 101.4 kpa, and the water vapor pressure is 1.79 kpa (absolute)