phy question

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?

更新:

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2 個解答

評分
  • 1 十年 前
    最佳解答

    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??

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  • CK
    Lv 7
    1 十年 前

    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.

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