Question

Water flows over a section of Niagara Falls at a rate of 1.31 × 106 kg/s and falls 71 m. The acceleration of gravity is 9.8 m/s 2 . How many 40 W bulbs can be lit with this power?

Answers

  1. Answer:

    2×10⁷ bulbs.

    Explanation:

    From the question,

    The the power generated by the water flows over a Niagara section is given as,

    P = M’gh……………………. Equation 1

    Where M’ = Fall rate, g = acceleration due to gravity, h = height of fall.

    Given: M’ = 1.31×10⁶ kg/s, g = 9.8 m/s², h = 71 m

    Substitute into equation 1

    P = 1.31×10⁶×9.8×71

    P = 9.115×10⁸ W.

    Number of 40 W bulb it can lit = P/40

    = 9.115×10⁸/40 = 2.27×10⁷ ≈ 2×10⁷ bulbs.

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