Consider a circle of radius 42 cm . An insect crawls with uniform speed of 1.3 cm/s alon

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3-2.Motion in Plane

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Consider a circle of radius $42\ cm$. An insect crawls with uniform speed of $1.3\ cm/s$ along the chord $AB$ then along the circular arc $BCD$ to reach point $D$ and then following cord $DA$ to reach finally $A$. Time spend by the insect to crawl from $A$ to $A$ is closest to ......... $\sec$

A$200$

B$196$

C$256$

D$100$

Solution

Distance ($D$) = $2R + 2 \pi R × \frac{2}{3} \ time = \frac{D}{v}$

Standard 11

Physics

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