Banking Physics Wave Mechanics Question Bank Mechanics

  • question_answer A jet plane moves up in air because

    A)  the gravity does not act on bodies moving with high speeds

    B)  the thrust of the jet compensates for the force of gravity  

    C)  the flow of air around the wings causes an upward force, which compensates for the force of gravity

    D)  the weight of air whose volume is equal to the volume of the plane is more than the weight of the plane         

    Correct Answer: B

    Solution :

     When jet plane flies, it ejects gases in backward direction at very high velocity. From Newton's third law, these gases provides the momentum to jet plane in forward direction plus compensates the force of gravity.

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