Three identical coins move in uniform circular motion on three different rotating…

PHYSICS · Single correct · A Level · Physics · Further mechanics and thermal physics · Further mechanics and thermal physics

Problem

Three identical coins move in uniform circular motion on three different rotating platforms. • Coin P: radius

0.20\,\text{m}

, frequency

3.0\,\text{rev}\,/\,\text{s}

• Coin Q: radius

0.40\,\text{m}

, frequency

2.0\,\text{rev}\,/\,\text{s}

• Coin R: radius

0.10\,\text{m}

, frequency

4.0\,\text{rev}\,/\,\text{s}

Rank the magnitudes of the coins’ centripetal accelerations. (a)

a_Q > a_P > a_R

(b)

a_R > a_P > a_Q

(c)

a_P > a_Q = a_R

(d)

a_Q = a_R > a_P