Please double check my work for question 8. For question 9 to get the mechanical advantage what height do I use on the screw driver?

8. Examine the lever system to the right. a) What is the mechanical m = 15 kg advantage of the system? d, = 1.4 m de = 3. box 3.6 m -- - 5.0 m a) 2.57 MA = 3.6 = 25 I mark 1. 4 b) What minimum force F is required on the left end in order to lift the 15 kg mass on the right? M = 15 Kg MA = Fg MA = 2. 57 Fepp Fg= 15 ( 9.8 ) = 147 N 2.57 = 147 Fapp b ) 57 N Fopp 2 marks = 57.198 9. Calculate the mechanical advantage of the screwdriver, with dimensions shown. length: 9.15 cm handle diameter: arm diameter: 2.40 cm 0.560 cm d = 9.15 cm MA=d "h = 0.560 cm = 9. 15c 9) 2 marks