The box weighs 400lb and the person can pull with 200 lb of force.

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The box weighs 400lb and the person can pull with 200 lb of force. Will this person be able to raise the box? What is the maximum weight he can life using the pulley system? Sorry i couldn't figure out how to start. Appreciate any help, Thanks!
 
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convert 200lb to Newtons: 200lb=91kgx9.80N/kg=891N (200lb)
This is the maximum force that the man can apply via the tension in the rope.

The object he is lifting has a force of gravity of 1782N (double the force he can lift)

The best way to lift it would be at constant speed. F=ma, F=0, therefore Tension=Force of Gravity on object.

**"Passing the rope over the pulley changes the direction of the tension in the rope, but doesn't change it's pulling force.