Q: Figure shown the circular motion of a particle. The radius of the circle, the period, sense of revolution and the initial position are indicated on the figure. The simple harmonic motion of the x-projection of the radius vector of the rotating particle P is

(a) x(t) = B sin(2πt/30)

(b) x(t) = B cos(πt/15)

(c) x(t) = B sin(πt/15 + π/2)

(d) x(t) = B cos(πt/15 + π/2)

Ans: (a)