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21 February, 09:51

A 0.90 m wide door turns though an angle of 45°. How long is the arc of the displacement?

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  1. 21 February, 10:03
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    L = r * C where L = length of the arc, r = radius of circular path and C is the angle turned through, in radians.

    So we have length of arc = 0.90 * 45 * pi/180

    = 0.71 m to nearest hundredth of a meter.
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