CBSE Class 11-science Answered
A cow is tethered to a corner of a field with a rope of length 7 m.
If she grazes on the length of 210 m , what is the angle through which the rope moves?
A. 45 degrees
B. 30 degrees
C. 60 degrees
D. 90 degrees
Correct
Correct Answer: B
how is this possible ?
Asked by minu joseph | 28 Mar, 2012, 08:16: PM
Expert Answer
We know that in a circle of radius r units, if an arc of length l units subtends an angle theta radian at the centre, then theta = l/ r.
Here, r = 7 m (length of rope will be equal to radius) and l = 210 m (length of arc will be the length which the cow grazed)
Thus, theta = 210/ 7 radians = 30 radians
Answered by | 28 Mar, 2012, 10:47: PM
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