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    western50's Avatar
    western50 Posts: 105, Reputation: 1
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    #1

    Oct 26, 2010, 07:46 PM
    newtons' laws
    Two identical blocks, A and B, of mass M, are stacked in an elevator as shown to the right. The elevator accelerates upwards with acceleration a . What is the magnitude of the force that block A exerts on block B?

    M (g+a)
    M (g-a)
    2 M (g+a)



    2. Three boxes are arranged as shown. The middle box has a mass of 2 kg and accelerates to the right at 5 m/s2 on a horizontal frictionless table. The boxes to the left and right hang freely, suspended by strings over massless, frictionless pulleys. The tension in the left string is T1 = 10 N.

    What is the mass of the box, M1, on the left?

    M1 = 0.675 kg
    M1 = 1.91 kg
    M1 = 2.13 kg
    M1 = 3.75 kg
    M1 = 4.16 kg
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
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    #2

    Oct 26, 2010, 10:24 PM

    Force that A exerts on B = ma

    m is the mass of A,
    a is the relative acceleration of A to B.

    Or if you prefer:



    Weight of A is Mg
    Reaction of A is what you are looking for,
    m_A is the mass of A, which is M,
    a is the acceleration of the system, that is a.

    2. What have you tried for this one?
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