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spookymod4845
10.03.2020 •
Physics
The efficiency of a squeaky pulley system is 73 percent. The pulleys are used to raise a mass to a certain height. What force is exerted on the machine if a rope is pulled 18.0 m in order to raise a 58 kg mass a height of 3.0 m
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Ответ:
129.9 m
Explanation:
Efficiency is the ratio of work output to work input, expressed as a percentage.
We know that work= mgh hence to get the work input
Work done by applied force=Fd
Fd=2338.273973 J
we have d as 18 m hence![F=\frac {2338.273973 J}{18}=129.9041096 m\approx 129.9 m](/tpl/images/0540/6612/e04e2.png)
Ответ:
"I have six eggs with me. I broke two, cooked two, and I ate two. How many eggs are left?" You would have FOUR eggs left because you broke, cooked, and ate the same two eggs.
Hope this helps :D