RRB ALP 10th Aug 2018 shift-1 Question 10

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 = $$\frac{25}{3}\times2\pi\ =\frac{50\pi\ }{3}\ $$.

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