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    Two particles P and Q of mass 2 kg and 3 kg respectively are connected by a light inextensible string. The string passes over a small smooth pulley which is fixed at the top of a rough inclined plane. The plane is inclined to the horizontal at an angle of 30°. Particle P is held at rest on the inclined plane and Q hangs freely on the edge of the plane with the string vertical and taut. Particle P is released and it accelerates up the plane at 2.5m s−2. Find

    a the tension in the string, T = 21.9

    b the coefficient of friction between P and the plane,

    c the force exerted by the string on the pulley.

    Could someone please go through parts b and c?
    And if there is a method/rule for part c on all questions that ask this please let me know!
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    (Original post by snoopyx)
    Two particles P and Q of mass 2 kg and 3 kg respectively are connected by a light inextensible string. The string passes over a small smooth pulley which is fixed at the top of a rough inclined plane. The plane is inclined to the horizontal at an angle of 30°. Particle P is held at rest on the inclined plane and Q hangs freely on the edge of the plane with the string vertical and taut. Particle P is released and it accelerates up the plane at 2.5m s−2. Find

    a the tension in the string, T = 21.9

    b the coefficient of friction between P and the plane,

    c the force exerted by the string on the pulley.

    Could someone please go through parts b and c?
    And if there is a method/rule for part c on all questions that ask this please let me know!
    Forces on P:
    Friction from the plane, = \mu R= \mu mg cos30
    Tension from the string =T

    T- \mu R= ma (this is the general method)
    then solve for \mu .

    for c) consider direction and magnitude of tensions of the string at the points where it meets the pulley. add vectorially.
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    (Original post by snoopyx)
    Two particles P and Q of mass 2 kg and 3 kg respectively are connected by a light inextensible string. The string passes over a small smooth pulley which is fixed at the top of a rough inclined plane. The plane is inclined to the horizontal at an angle of 30°. Particle P is held at rest on the inclined plane and Q hangs freely on the edge of the plane with the string vertical and taut. Particle P is released and it accelerates up the plane at 2.5m s−2. Find

    a the tension in the string, T = 21.9

    b the coefficient of friction between P and the plane,

    c the force exerted by the string on the pulley.

    Could someone please go through parts b and c?
    And if there is a method/rule for part c on all questions that ask this please let me know!
    Umm, hey snoopyx, instead of answering u i m asking you a question, lol :P
    I wanted to ask that are u able to solve the C part of this ques? If yes so Pls lemme know, i tried many ways but the answer ain't coming, which is at the back of book!
 
 
 
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