Interactive Solution 11.35 at www.wiley.com/college/cutnell is a model for this problem. Multiple-Concept Example 8 also presents an approach to problems of this kind. The hydraulic oil in a car lift has a density of 8.30 ×10^2  kg / m^3. The weight of the input piston is negligible. The radii of the input piston and output plunger are 7.70 ×10^-3  m and 0.125  m, respectively. What input force F is needed to support the 24500-N combined weight of a car and the output plunger, when (a) the bottom surfaces of the piston and plunger are at the same level, and (b) the bottom surface of the output plunger is 1.30  m above that of the input piston? | Numerade