Lever problem

1. Feb 12, 2012

John78

1. The problem statement, all variables and given/known data

The crates( one create 500 kg) are placed on a hydraulic lifting beam:

1. State the order of lever used here
2. Calculate the effort required to lift the load
3. Calculate mechanical advantage for this system
4. Calculate the velocity ratio for this system. If the work put in is 5000J.Calculate the useful energy output.
5. System has efficiency of 80%. Calculate the velocity ratio for this system.

2. Relevant equations

1. Only class 1 and class 2 levers can be used to gain mechanical advantage

2. large distance x small effort = small distance x large load

4. Velocity ratio = distance moved by effort/distance moved by load
Efficiency = output/input

5. Efficiency = mechanical advantage/velocity ratio

3. The attempt at a solution

1. First order???
2. effort x 8 = 500x9.81x7, effort= 34335 N ????
3. ?
4. ?
5. ?

I hope to get any idea to solve them or help me to solve any one
I'm looking forward to get yr help

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2. Feb 12, 2012