JAMB - Physics (1983 - No. 29)
A machine has a velocity ratio of 5. It requires a 50kg weight to overcome a 200kg weight. The efficiency is
4%
5%
40%
50%
80%
解释
Efficiency = M.A x 100%
= \(\frac{200}{50}\) x \(\frac{1}{5}\) x 100
= 80%
= \(\frac{200}{50}\) x \(\frac{1}{5}\) x 100
= 80%