al applied question
2007-12-27 8:53 am
1)a light inextensible string hangs over a smooth fixed pulley. it carries at one end a partivle of mass 3 kg, and at the other end a small smooth pulley whose weight may be neglected. Over this pulley hangs a second string carrying at its end particles of mass 1 kg and 2 kg. find the accelerations of the particles.
回答 (2)
2007-12-27 11:47 pm
✔ 最佳答案
As follows:圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Dec07/Crazymech3.jpg
圖片參考：http://i117.photobucket.com/albums/o61/billy_hywung/Dec07/Crazymech4.jpg
參考: My Maths knowledge
2007-12-27 9:09 am
For the first pulley, both sides are having 3 kg, force balanced and hence no acceleration for the particle of 3kg
For the second pulley, the net force is 2g - 1g = 1g
Thus, the acceleration will be 1g / 3 = 3.3 m/s^2 (take g = 10)
(upwards for the particle of 1kg and downwards for the particle of 2kg)
2007-12-30 18:23:05 補充：
o .... I made it wrong .....the one downstairs is correct ....
For the second pulley, the net force is 2g - 1g = 1g
Thus, the acceleration will be 1g / 3 = 3.3 m/s^2 (take g = 10)
(upwards for the particle of 1kg and downwards for the particle of 2kg)
2007-12-30 18:23:05 補充：
o .... I made it wrong .....the one downstairs is correct ....
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