Test Index

JAMB Physics 2010 Paper

© africaexams.com

Question : 5

Total: 47

A machine of velocity ratio 6 requires an effort of 400 N to raise a load of 800 N through I m. Find the efficiency of the machine

55. 6 %
50.0%
33.3%
22.2%

Solution:

Concept:

Efficiency compares the useful work output to the work input using the mechanical advantage and velocity ratio.

Explanation:

Mechanical advantage,

MA = \frac{\text{load}}{\text{effort}} = \frac{800}{400} = 2

.

Velocity ratio,

VR = 6

.

Efficiency,

\eta = \frac{MA}{VR} \times 100\%

.

\eta = \frac{2}{6} \times 100\% = 33.3\%

.

Answer:

C.

33.3\%

© africaexams.com

Go to Question:

Prev Question

Next Question