A rectangular plate of sides \( a \) and \( b \) is suspended from a ceiling by two parallel str...

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A rectangular plate of sides \( a \) and \( b \) is suspended from a ceiling by two parallel strings of length \( L \) each (figure 12-E11). The separation between the strings is \( d \). The plate is displaced slightly in its plane keeping the strings tight. Show that it will execute simple harmonic motion. Find the time period.
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