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Yogita Ingle 6 years, 1 month ago
diameter=1m
therefore radius=0.5m
circumference=2πr
=2×3.14×0.5
=3.14m
we know that 1km=1000m
therefore 78.5km=78500m
hence, no. of revolution=78500/3.14
=25000
hence, final answer is 25000 revolution.
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Yogita Ingle 6 years, 1 month ago
The relation between radius of curvature and focal length is given by
R = 2f
f = 15cm
R = 2(17) = 34cm
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Aman Vats 6 years, 1 month ago
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