Most cars have hydraulic brakes. when a person pushes on the brake pedal, a force is applied to a small piston with a cross-sectional area of 1.8 cm2. by pascal's principle, the pressure is transmitted through the brake fluid to two larger pistons (each with an area of 8 cm2). the larger pistons push on the brake pads and the brake pads rub against the rotor (which stops the car). when a force of 7.6 n is applied by the brake pedal to the small piston, what force (in n) does each of the larger pistons apply to the rotor?

Certain bacteria (such as aquaspirillum magnetotacticum) tend to swim toward the earth’s geographic north pole because they contain tiny particles, called magnetosomes, that are sensitive to a magnetic field. if a transmission line carrying 100 a is laid underwater, at what range of distances would the magnetic field from this line be great enough to interfere with the migration of these bacteria? (assume that a field less than 5% of the earth’s field would have little effect on the bacteria. take the earth’s field to be 5.0 * 10-5 t, and ignore the effects of the seawater.)