How much can be lifted with a wheel barrow?

[katamoria]

Homework Statement

suppose that you can lift no more than 450N unaided.
a) how much can you lift using a 2 m long wheel barrow? assume that the wheelbarrow weighs 80N and that its center of gravity is .6m from the wheel. in addition, assume hat the load carried in the wheelbarrow is also .6m from the wheel
b) where does the force come from to enable you to lift more than 450N when you use the wheelbarrow?

Homework Equations

Torque = force x perpendicular distance between the axis and the line of action of the force
sum of torques = Ia

The Attempt at a Solution

I thought I could set the weight lifted equal to forces with the angled lift, but either that's wrong or i don't know how to do it.

 

[mgb_phys]

Think of force * distance for the weight and your lift, both measured from the wheel