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2. During a thunderstorm a spherical hail stone of radius 3 mm falls through the air at a constant speed. a. Calculate the weight of

2. During a thunderstorm a spherical hail stone of radius 3 mm falls through the air at a constant speed. a. Calculate the weight of the hailstone. (density of ice = 920 kgm 3 and g = 9.81 Nkg-1) [1] b. If the viscosity of air is 1.8 x 10-5 Nsm-2, calculate the speed at which the hailstone is falling. [2]

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