a wind blows steadily at 90° to a yacht sail of area 3.8 m^2. the velocity of the wind is 20 ms^-1. show that the mass of air hitting the sail each second is approximately 90kg. the density of air is 1.2 kgm^-3
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carried. SP 1a.3 Vectors and scalars. Strengthen. 1 a scalar b vector c scalar ... 3 velocities for each section: A = 200 m / 50 s = 4 m/s; B ... 2 a Force from pedals, air resistance, friction.
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