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`        A soild body starts rotating about stationary axis with an angular acceleration=t/50,t is in seconds.How soon after the beginning of rotation will the total acceleration vector of an arbitary point of the body form an angle 60degrees with its velocity vector?`
7 years ago

68 Points
```										Dear  krishna ,
a                                                =  t/50     = dw/ dt  hence  dw =  (t/50 )dt  on integrating   w =   t2 /100   a tangential =  ar = 2*10-2 t  a centripetal =w 2r = 10-4 t4  also   tan 60 =  √3 = a centripetal / a tangential                     = t3 /  (2 * 102 )   hence  t3  =  2* 3*102      346.4  or  t     =    7 seconds

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7 years ago
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