Answer: I don't know but I also need help with an assignment:
You wish to lift a 400 lb car engine a vertical distance of 3 ft using a strong rope. Unfortunately, your hand crank winch can only generate 100 lb of tension in your rope. In order to overcome this obstacle, you use a multiple pulley system (block and tackle) to lift the engine.
What is the mechanical advantage of this system?
What length of rope is required to complete the work?
