Questions
A particle travels in a circle of radius 20 cm at a uniformly increasing speed. If the speed changes from 8 to 9 in 2s, what would be the angular acceleration (in rad )? [UK PMT 2015]
detailed solution
Correct option is B
Given, radius of the circle =20cm=20×10−2mWhen speeds are 8ms-1 and 9ms-1 then angular speeds arerespectiveIy, ω1=820×10−2=40rads−1and ω2=920×10−2=45rads−1∴ Angular acceleration =ω2−ω1t=45−402=2.5rads−2Talk to our academic expert!
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A particle of mass m is moving in a circular path of constant radius r such that its centripetal acceleration ac is varying with time to as ac= k2rt2 where k is a constant. What is the power delivered to the particle by the forces acting
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