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?

Astone is dropped from the upper observation deck of a tower, 250 m above the ground. (assume g = 9.8 m/s2.) (a) find the distance (in meters) of the stone above ground level at time t. h(t) = (b) how long does it take the stone to reach the ground? (round your answer to two decimal places.) s (c) with what velocity does it strike the ground? (round your answer to one decimal place.) m/s (d) if the stone is thrown downward with a speed of 2 m/s, how long does it take to reach the ground? (round your answer to two decimal places.) s