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![[Post New]](/templates/default/images/icon_minipost_new.gif) 15 Nov 2007 01:57:26 IST
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A man of 60 kg is sitting on a light scaffold chair attached to one end of a massless inextensible rope. The force with which he should pull down the other end of the rope, which passes over a smooth pulley so that he achieves an upward acceleration of 0.2m/s2 is?
a- 30N b- 300N c-3000N d-6000N
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15 Nov 2007 08:53:07 IST
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Let he pulls the rope with force F (The string will pul him up by an equal force F) so tesion in string is also F. So Net upward force is 2F
2F=600N
So F=300N
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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