A hydraulic lift has been constructed to lift the haters of maximum 3000 their area of cross section of the Pistons platform on which the vehicles are lifted is 580 square centimetre calculate the maximum pressure experienced on a small Piston

The period of a pendulum varies directly as the square root of the length of the pendulum and inversely as the square root of the acceleration due to gravity. find the period when the length is 144 cm and the acceleration due to gravity is 980 cm per second squared, if the period is 7pi seconds when the length is 289 cm and the acceleration due to gravity is 980 cm per second squared.

What kind of simple machine is a catapult?

Am i correct on these two physics questions?