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The particles move in the x-y plane according to the rules x=a\ sin\ \omega t  and   y=a\ cos \ \omega t. The particles are as follow:

Option: 1

An elliptical path


Option: 2

A circular path


Option: 3

A parabolic path

 


Option: 4

A straight-line path inclined equally to x and y-axis.


Answers (1)

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Answer: (2) A circular path.

Explanation:

  x=a\ sin \omega t                                    

Or, \frac{x}{a}=\ sin\omega t    ---------------- (1)                   

And,    y=a\ cos\omega t       

Or,  \frac{y}{a}=a\ cos\omega t -------------- (2)      

Adding equation (1) and (2), we get:

 \frac{x^2}{a^2}+\frac{y^2}{b^2}=1                  

Or,  x^2+y^2=a^2            

This is an equation of a circle, so the particle follows the circular path.

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