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  1. #1
    Member Mr Rayon's Avatar
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    easy question

    When the space shuttle takes off, its initial acceleration is 3.0 m/s^2. It has an initial mass of about 2.2* 10^6 kg.

    What is the magnitude of the upward thrust as it takes off?

    EDIT:I tried substituting the value for the mass and the acceleration into Newton's Second Law of Motion (F=ma) but got 6.6*10^6 N. This is not the correct answer. The correct answer should be 2.9*107 N, according to my textbook. Could somebody please show me the complete working out? Perhaps I misunderstood what it meant by upward thrust?
    Last edited by Mr Rayon; October 2nd 2009 at 01:50 AM.
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  2. #2
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    mr fantastic's Avatar
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    Quote Originally Posted by Mr Rayon View Post
    When the space shuttle takes off, its initial acceleration is 3.0 m/s^2. It has an initial mass of about 2.2* 10^6 kg.

    What is the magnitude of the upward thrust as it takes off?

    EDIT:I tried substituting the value for the mass and the acceleration into Newton's Second Law of Motion (F=ma) but got 6.6*10^6 N. This is not the correct answer. The correct answer should be 2.9*107 N, according to my textbook. Could somebody please show me the complete working out? Perhaps I misunderstood what it meant by upward thrust?
    Fnet = ma = (2.2 x 10^6)(3.0) = 6.6 x 10^6.

    Fnet = Thrust - Weight force = thrust - (2.2 x 10^6)(g) = thrust - (2.2 x 10^6)(9.8) = thrust - 2.156 x 10^7.

    Therefore 6.6 x 10^6 = thrust - 2.156 x 10^7.

    I get thrust = 2.816 x 10^7 N, a slightly different answer to the book.
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