Question

The wheel of a bus 0.75 m radius makes 84 revolution in half minute

Answer 1

The speed of bus is 13.2$\dfrac{m}{secend}$.

Explanation:

Given,

The radius of wheel(r) = 0.75 m and number of revolution = 84

∴ Circumference of the wheel = $2\pi r$

= $2\times \frac{22}{7} \times 0.75$ m

1 revolution =$2\times \frac{22}{7} \times 0.75$ m

∴ 84 revolutions = $84\times 2\times \frac{22}{7} \times 0.75$m

= 396 m

∴ Speed = $\dfrac{Distance}{Time}$

= $\dfrac{396}{\dfrac{1}{2} }$ $\dfrac{m}{minute}$

= $\dfrac{396}{\dfrac{1}{2} }$ ×$\dfrac{1}{60}$ $\dfrac{m}{secend}$

=$\dfrac{792}{60} \dfrac{m}{secend}$

= 13.2$\dfrac{m}{secend}$