A pendulum has a period 2sec. The bob pulled aside a distance 8cm as the amplitude and release. Find the displacement of the bob 0.7sec after it has been released.


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Question Number 166904 by MathsFan last updated on 01/Mar/22

$A p e n d u l u m h a s a p e r i o d 2 s e c . T h e$ $b o b p u l l e d a s i d e a d i s t a n c e 8 c m a s$ $t h e a m p l i t u d e a n d r e l e a s e . F i n d t h e$ $d i s p l a c e m e n t o f t h e b o b 0.7 s e c a f t e r$ $i t h a s b e e n r e l e a s e d .$
	Answered by mr W last updated on 02/Mar/22

	$ω = \frac{2 π}{T}$ $s (t) = A \cos ω t = A \cos \frac{2 π t}{T}$ $s (0.7) = 8 \cos \frac{2 π \times 0.7}{2} = - 4.7 c m$
	Commented by MathsFan last updated on 02/Mar/22

	$t h a n k y o u b o s s$
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