JEE Main2017PhysicsLaws of MotionActual
A conical pendulum of length l makes an angle θ = 45 ° with respect to Z - axis and moves in a circle in the X Y plane. The radius of the circle is 0.4 m and its center is vertically below O . The speed of the pendulum, in its circular path, will be - T a k e g = 10 m s - 2
Options
- A0.2   m   s - 1
- B0.4   m   s - 1
- C2   m   s - 1
- D4   m   s - 1
Correct answer
C. 2   m   s - 1
Step-by-step solution
T sin ⁡ θ = m v 2 r T cos ⁡ θ = m g tan ⁡ θ = v 2 r g θ = 45 o v 2 = r g v = r g = 0.4 × 10 v = 2   m   s - 1