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SHM13

1.2.7 Example


A body moves in a simple harmonic motion and the following graph gives the variation of its displacement x with time t.
 


a)    Write an equation to represent the given simple harmonic motion.
b)    Find the time duration in the first cycle when the body is located above a displacement of 0.25 m.

[ x = xo sin (1.05 t) , Δt = 1.9 s ]

The hint can be found in the model

1.2.7.1 Solution:

a) x0 = 0.5 m

since ω = 2 π T , ω = 2 π 6.0

ω = 1.05
x = x0sin(ω t) = 0.5 sin(1.05t)

b) At x = 0.25 m,

substituting back into the equation,

0.25 = 0.5 sin(1.05t)

solving for t gives

0.5 = sin(1.05t)


solving of the ranging of time, t

1.05t = 0.524 and π - 0.524

t1 = 0.5 , t2 = 2.4 s

looking at the graphical form of the solution of the 2 times, t1 and t2.

giving the range to be t2 - t1 = 2.4 - 1.5 = 1.9 s


1.2.7.2 Model:

  1. Run Sim
  2. http://iwant2study.org/ospsg/index.php/76
 

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end faq

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