Physics

Problem

## Questions 9-10 A particle moves in a circle in such a way that the x and y -coordinates of its motion are given in meters as functions of time

t

in seconds by:

x=5 \cos (3 t) \quad y=5 \sin (3 t)

9. What is the period of revolution of the particle? (A)

1 / 3 \mathrm{~s}

(B) 3 s (C)

2 \pi / 3 \mathrm{~s}

(D)

3 \pi / 2 \mathrm{~s}

(E)

6 \pi \mathrm{~s}

(A)

1 / 3 \mathrm{~s}

(B) 3 s (C)

2 \pi / 3 \mathrm{~s}

(D)

3 \pi / 2 \mathrm{~s}

(E)

6 \pi \mathrm{~s}