Question

A gear has the driving wheel of radius $2cm$ and driven wheel of radius $20cm.$
If the number of rotations made per minute by the driving wheel is $100,$ find the number of rotations per minute made by the driven wheel.

Answer 1

The radius of driving wheel $r_A=2cm$

The radius of driven wheel $r_B=20cm$

The number of rotations made per minute by the driving wheel is $n_a=100$

The number of rotations made per minute by the driven wheel $n_b=\frac{r_A}{r_B}\times n_a=\frac{2}{20}\times 100=10$