Question 10

# A Lawn roller makes 20 revolutions in one hour. The radians it runs through 25 minutes is

Solution

1 revolution = 2 radian$$\pi\$$

Given that,

The number of revolution in 1 hour = 20

The number of revolution in 25 minutes = $$20\times\ \frac{25}{60}=\frac{25}{3}$$

The radians it run through in 25 minutes = $$\frac{25}{3}\times2\pi\ =\frac{50\pi\ }{3}\$$.