How much work is done in moving a body of mass 1.0 kg from an elevation of 2 m to an elevation of ​

Question

How much work is done in moving a body of mass 1.0 kg from an elevation of 2 m to
an elevation of ​

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Tài Đức 5 years 2021-08-09T22:47:13+00:00 1 Answers 222 views 0

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  1. thnahdat
    2
    2021-08-09T22:49:04+00:00
    Reply

    Answer:

    The work done is -176.4 J.

    Explanation:

    Given that,

    Mass = 1.0 kg

    An elevation of  2 m to an elevation of 20 m.

    Suppose,  Find the work done by the gravitational field of the earth?

    We need to calculate the force

    Using formula of force

    F=mg

    Put the value into the formula

    F=1.0\times9.8

    F=9.8\ N

    We need to calculate the displacement

    Using formula of displacement

    Displacement = s_{2}-s_{1}

    s=20-2=18\ m

    The direction of displacement is upward.

    Since gravitational force is downwards and displacement is upwards,

    Then the angle is 180°.

    We need to calculate the work done

    Using formula of work

    W=f\cdos s\cos\theta

    W=9.8\times18\cos180

    W=-176.4\ J

    Hence, The work done is -176.4 J.

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )