What is mechanical advantage and how does it effect efficiency?

label Physics
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You use a pulley to lift your bike to the ceiling for winter storage. When you bought the pulley, the salesman claimed that the pulley has a mechanical advantage of 10. While lifting the bike, you notice that the pulley is squeaking because it has rusted over the summer. You determine that the pulley now has an actual mechanical advantage of 3. What is its efficiency?

Jul 9th, 2015

Thank you for the opportunity to help you with your question! the solution is as such:

3/ 10 =0.3

so the efficiency is 0.3 0r 30%

Please let me know if you need any clarification. I'm always happy to answer your questions.awaiting a positive feedback. It was lovely helping you. Please do contact or text me directly for more work assistance. Looking forward to help you again.
Jul 9th, 2015

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Jul 9th, 2015
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Jul 9th, 2015
Oct 19th, 2017
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