Physicshard · Past Paper
What is the displacement of a particle moving in a circle of radius r after it has turned through an angle theta?
Ar*theta
B2r sin(theta/2)
Cr sin(theta)
Dr cos(theta)
✓ Correct Answer: B — 2r sin(theta/2)
Using the law of cosines in the triangle formed by the two radii, displacement = sqrt(r^2 + r^2 - 2r^2 cos(theta)) = 2r sin(theta/2).
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