Question

A playground merry-go-round has a mass of 120 kg and a radius of 1.80 m and it is rotating with an angular velocity of 0.350 rev/s. What is its angular velocity (in rev/s) after a 22.0 kg child gets onto it by grabbing its outer edge? The child is initially at rest. Incorrect: Your answer is incorrect. rev/s

Answer 1

we have given the mass of merry-go-round 2120kg Radius= 1.80m angular velouty = 0.350 rev/see its angular velocity after a 22kg Child gets onto it by grabbing its outer edge As we know if there is not any torque acting the angular momentin get consernd Li=lf Zl; wi= 2 If Wf I V=red spent 0.3 So revolutions See = 21 Reinhitions /min (2. ve 2. posmin = 2.2 readine lee Insteal angular relocity = 2.2 roodian/ See Wie 2.2 radssec (myte to Pena 2) wf = ( 4 mt w wf = 1 morsand wi Mmranda mass of merry of gon = (1 x 120x2:2) ~ 1.61 and/sec (22760) wf (or) (1x 120 x 0.350 ) 7 0.256rev/sec 12 722+60)

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