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Q.

The minuet hand of a clock r 2.1 cm long. How tar does its dip move in 2o minutes?

Class: 9

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a

5.0cm

b

4.4cm

c

4.0cm

d

2.4cm

answer is B.

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Detailed Solution

Given
length of minute hand = 2.1cm
we know that, when the circle makes one round implies that that the circle is of 2π degrees.
Thus we get that.
2π = 60
π = 30
1 minute radian
We will Calculate the radian for 20 minutes
…(i)
from formula
…(ii)
on Comparing equation (i) and equation (ii)
l = 2 π × 0.7
l = 2 × 22 × 0.1
l = 4.4cm
Hence, The tip covered length in 20min is 4.4cm.
So option. (2) is correct

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The minuet hand of a clock r 2.1 cm long. How tar does its dip move in 2o minutes?Class: 9