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Physics
Air is streaming past a horizontal airplane wing such that its speed is 120 ms^-1over the upper suface and 90 ms^-1 at the lower surface. if the density of air is 1.3 kg m ^-3 , find the difference in the pressure between the top and the bottom of the wing. If the wing is 10 m long and has an average width of 2 m , calculate the gross lift of the wing.
Chemistry
Ninteen grams of molten SnCl₂ is electrolysed for some time using inert electrodes until 0.119 g of Sn is deposited at the cathode. No substance is lost diring the electrolysis. Find the ratio of the masses of SnCl₂and SnCl₄ after electrolysis.
Mathematics
Let a, b, and c be three integers such that at least two of them are unequal and w (1) is a cube root of unity. The least value of the expression \|a + bw + cw²\| is (a)0 (b)1 (c) (d) 1 / 2

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