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8 March, 23:11

A packet weighs 40kg in air but when it is totally submerged into a 1mx1m square tank the weight of the packet is only 18kg. How much does the water rise in the tank?

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  1. 9 March, 03:02
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    water rise = 22 mm

    Explanation:

    weight of packet IN AIR = 40 * 9.81 = 392.4 N

    weight of packet IN WATER = 18 * 9.81 = 176.58 N

    by Archimedi's principle

    difference in weight = weight of displaced water

    w_a - w_w = / rho_w v_d g

    392.4 - 176.58 = 1000 * v_d * 9.81

    v_d = 0.022 m^3

    v_d = A*H_rise

    0.022 = 1*H_rise

    H_rise = 0.022 m = 22 mm

    water rise = 22 mm
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