CBSE Class 11-science Answered
A phonograph record rotates at 45 revolutions /minute. What is its angular speed in rad/s? Through many degrees does it rotate in 0.2 s?
Asked by lekhakarthikeyan | 02 Aug, 2017, 10:17: PM
Expert Answer
The following steps are to be followed for solving the query:
1) The frequency of rotation of the phonograph is given 'n'. Use the relation of angular speed ω = 2πn to find angular speed. Do not forget to convert the right units. (rev/min → [rad/rev]×[rev/min]×[min/60 s])
2) The angle through which it rotates can be calculated by finding the time period. Use T = 2π/ω to find T. This will tell how much time it takes to complete 360°. So, using this find number of degrees in 0.2 s. The final answer is 36°.
Answered by Romal Bhansali | 03 Aug, 2017, 12:42: PM
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