A student holds thin strip of paper below his lower lip and blows air horizontally over it. If the surface area of one side of the paper is A and the mass of the strip is m speed v, with which the air should be blown in order to keep the strip horizontal is (consider the density of air 𝜌)
(1) 𝑣= v2mg/ρA (2) 𝑣= vmg/ρA (3) 𝑣= vmg/2ρA (4) 𝑣= vmg/3ρA (5) 𝑣= v3mg/ρA
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