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A square frame has sides that measure 2.30 m when it is at rest. What is...

A square frame has sides that measure 2.30 m when it is at rest. What is the area of the frame when it moves parallel to one of its diagonal with a speed of 0.86c as indicated in the figure ?

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Answer #1

The area of a quadrilateral with given diagonal can be given as

Initially when the square frame was at rest then the area is

Now when it moves along on of its diagonal, it will get contracted. The contracted length of diagonal is

There is no change in the other diagonal which will be perpendicular to first diagonal hence area will be

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