Dentist's chairs are examples of hydraulic lift systems. if the chair weighs 1,600 n and rests on a piston with a cross-sectional area of 1,440 cm2, what force must be applied to the small piston, which has a cross-sectional area of 72 cm2, to lift the chair?

Suppose that three astronomical objects, 1, 2, and 3 are observed to lie on a line, and the distance from object 1 to object 3 is d. object 1 has four times the mass of object 3, and seven times the mass of object 2. find the distance between objects 1 and 2 for which the net force on object 2 is zero.