The 75 kg student in (Figure 1) balances a 1200 kg elephant on a hydraulic lift. Figure 1 of 1 Part A What is the diameter of the piston the student is standing on? Express your answer with the appropriate units. View Available Hint(s) d = Part B When a second student joins the first, the height difference between the liquid levels in the right and left pistons is 35 cm. What is the second student's mass? Express your answer with the appropriate units. View Available Hint(s) m =