A sample of blood is placed in a centrifuge of radius 11.0 c…

A sample of blood is placed in a centrifuge of radius 11.0 cm. The mass of a red blood cell is 3.0 ✕ 10−16 kg, and the magnitude of the force acting on it as it settles out of the plasma is 4.0 ✕ 10−11 N. At how many revolutions per second should the centrifuge be operated?

The spring of the pressure gauge shown in the figure has a f…

The spring of the pressure gauge shown in the figure has a force constant of 900 N/m, and the piston has a radius of 1.5 cm. As the gauge is lowered into water, what change in depth causes the piston to move in by 0.88 cm? The density of water is 1,000 kg/m3. Give your answer in meters.