A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If…

A particle moving in a circle of radius R with a uniform speed takes a time T to complete one revolution. If this particle were projected with the same speed at an angle  θ to the horizontal, the maximum height attained by it equals 4R. The angle of projection θ is then given by___
  1. θ=cos-1gT2π2R12
  2. θ=cos-1π2RgT212
  3. θ=sin-1π2RgT212
  4. θ=sin-12g T2π2R12

Solution

T=2πω=2πRvv=2πRT

H=v2sin2θ2g4R=4π2R2sin2θ2gT2

sin2θ=2gT2π2R

sinθ=2gT2π2R1/2

θ=sin-12gT2π2R12

Asked in: NEET 2021

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