block a of mass 5kg is placed on a rough inclined plane and is connected to block b of mass 8kg by a light inextensible string, passing over a pulley as shown in the figure. black a moves up the inclined plane with an acceleration 2ms-2.
what is the tension in the string?
what is the friction between block a and the inclined plane?
2006-11-25 12:15:22 · 2 個解答 · 發問者 一個尋找知識中的小伙子 5 in 科學 ➔ 其他：科學
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2006-11-25 13:13:03 · update #1
首先要分開畫free body diagram ,
for a, T-(mgsin30*+f)=ma
T-(25+f)=10......(1)
for b, mg-T=ma
80-T=16
T=64N
sub T=64 into(1)
64-25-f=10
f=29N
唔知我計得岩唔岩呢??
2006-11-25 15:30:48 · answer #1 · answered by fan 2 · 0⤊ 0⤋
what is the angle between the inclined plane and horizontal. If no angle is specified. nobody can help you.
2006-11-25 18:11:59 補充：
It has a force component of mgsinθ along the inclined plane. It needs θ to do the calculations.
2006-11-25 13:09:23 · answer #2 · answered by ? 7 · 0⤊ 0⤋