A block and tackle is used to raise a load of 250N through a vertical distance of 30m. What is the efficiency of the system if the work done against friction is 1500J?
-
A.
62.5% -
B.
73.3% -
C.
83.3% -
D.
94.3%
Correct Answer: Option C
Explanation
Y = (frac{work output}{work input} times frac{150}{1})
Y = (frac{250 times 30}{250 times 30 + 1500} times frac{150}{1})