AP EAMCET201822 Apr 2018Morning ShiftPhysicsLaws of MotionActual
Two spheres P and Q, each of mass 200 g are attached to a string of length one metre as shown in the figure. The string and the spheres are then whirled in a hor i zon tal circle about O at a constant angular speed. The ratio of the tension in the string between P and Q to that of between P and O is (P is at mid-point of the line joining O and Q)
Options
- A1 2
- B2 3
- C3 2
- D2 1
Correct answer
B. 2 3
Step-by-step solution
Tension between P and Q is T₁= centripetal force on Q=m r ^2 =200 1 ^2 ( ~g m rad ^2 ~s ^2 ) Tension between O and P is T₂= centripetal force on Q+ centripetal force on P=200 1 ^2+200 1 2 ^2=300 1 ^2 ( ~g m rad ^2 ~s ^2 ) Ratio of tension is T₁ T₂ = 200 1 ^2 300 1 ^2 = 2 3