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What is long chard?

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What is long chard?

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Hello.....I think its not "Chard" ..may be it is "chord" Diameter of circle is known as long chord......... Chord is the distance between two points of a circle
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A uniform water stream at 5 m/sec over a rough surface, placed parallel to the flow and towed at 3 m/sec opposing the flow. Calculate the power required to tow the plate if it is 2 m long and 1 m wide.
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