Question partPointsSubmissions1 2 30/1 0/1 0/10/5 0/5 0/5Total0/3 In a hydraulic lift, the radii of the pistons are 2.04 cm and 9.8 cm. A car weighing W 11.5 kN is to be lifted by the force of the large piston.(a) What force Fa must be applied to the small piston? (N)(b) When the small piston is pushed in by 8.6 cm, how far is the car lifted? (mm)(c) Find the mechanical advantage of the lift, which is the ratio W / Fa.
(a) Area of small piston: pi x radius x radius 3.142 x 2.04 x 2.04 13.1 cm^2 W 11.5 kN 11500 N Area of large piston pi x radius x radius 3.142 x 9.8 x 9.8 301.8 cm^2 Pressure needed at large piston Force / Area 11500 / 301.8 38.1 Pa Therefore force needed at small piston Pressure x Area 38.1 x 13.1 498.3 N (b) Hmmmmm this one got me thinking.and I frankly have not even a tiny clue. Sorry!!! (c) M.A. W / Fa 11500 / 498.3 2.31
To add to what autotech said, your crankarm is the problem can easily be repaired if it's not worn too much. It's only a small assembly about 4-5 inches long. I've fixed mine in about 2 minutes. If you remove the cowl over the wiper motor assem., you can watch the crank arm make its rotation around slide up over a small metal ramp. When you shut your wipers off it should stop there but it doesn't because this tab is bent out (towards the passenger side) I've used a flat screwdriver a hammer to tap it back in place. If it's not wore too much it's an easy cheap fix.
There are flapping wing type aircraft, they are called Ornithopters. I Dont know if any full scale ones have been sucsessfully flown but there are loads of model size ornithopters available. not sure they use hydraulics for the flapping motion either.
(a) Area of small piston: pi x radius x radius 3.142 x 2.04 x 2.04 13.1 cm^2 W 11.5 kN 11500 N Area of large piston pi x radius x radius 3.142 x 9.8 x 9.8 301.8 cm^2 Pressure needed at large piston Force / Area 11500 / 301.8 38.1 Pa Therefore force needed at small piston Pressure x Area 38.1 x 13.1 498.3 N (b) Hmmmmm this one got me thinking.and I frankly have not even a tiny clue. Sorry!!! (c) M.A. W / Fa 11500 / 498.3 2.31
To add to what autotech said, your crankarm is the problem can easily be repaired if it's not worn too much. It's only a small assembly about 4-5 inches long. I've fixed mine in about 2 minutes. If you remove the cowl over the wiper motor assem., you can watch the crank arm make its rotation around slide up over a small metal ramp. When you shut your wipers off it should stop there but it doesn't because this tab is bent out (towards the passenger side) I've used a flat screwdriver a hammer to tap it back in place. If it's not wore too much it's an easy cheap fix.
There are flapping wing type aircraft, they are called Ornithopters. I Dont know if any full scale ones have been sucsessfully flown but there are loads of model size ornithopters available. not sure they use hydraulics for the flapping motion either.
