Physics > 2002 > 3
JAMB UTME
A wheel and axle is used to raise a load of 500 N by the application of an effort of 250N. If the radii of the wheel and the axle are 0.4cm and 0.1cm respectively, the efficiency of the machine is
A.
20%
B.
40%
C.
50%
D.
60%
Answer: C
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