SOLUTION: Rosa has designed a pulley system for a school science project. She has determined that as the coefficient of friction increases, the efficiency of the pulley decreases. With a coe

Algebra ->  Inverses -> SOLUTION: Rosa has designed a pulley system for a school science project. She has determined that as the coefficient of friction increases, the efficiency of the pulley decreases. With a coe      Log On


   

Question 952001: Rosa has designed a pulley system for a school science project. She has determined that as the coefficient of friction increases, the efficiency of the pulley decreases. With a coefficient of friction of 0.2, the efficiency of the pulley is 75%. What would you expect the efficiency to be if the coefficient of friction increased to 0.3?
Answer by stanbon(75887) About Me  (Show Source):
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Rosa has designed a pulley system for a school science project. She has determined that as the coefficient of friction increases, the efficiency of the pulley decreases.
e = k/f
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Solve for "k" using "With a coefficient of friction of 0.2, the efficiency of the pulley is 75%".
0.75 = k/0.2
k = 0.75*0.2 = 0.15
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Equation:
e = 0.15/f
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What would you expect the efficiency to be if the coefficient of friction increased to 0.3?
e = 0.15/0.30
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Cheers,
Stan H.
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coefficient of friction = 1/2