Physics (AS & A Level) · Oct / Nov 2019 · Paper 21 · Question 3
9702
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The question as text
A small remote-controlled model aircraft has two propellers, each of diameter 16 cm. Fig. 3.1 is a side view of the aircraft when hovering. 16 cm 16 cm body of aircraft air speed 7.6 m s–1 air speed 7.6 m s–1 propeller propeller Fig. 3.1 Air is propelled vertically downwards by each propeller so that the aircraft hovers at a fixed position. The density of the air is 1.2 kg m–3. Assume that the air from each propeller moves with a constant speed of 7.6 m s–1 in a uniform cylinder of diameter 16 cm. Also assume that the air above each propeller is stationary.
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3(a)[3]
3(b)(i)[1]
3(b)(ii)[1]
3(c)(i)[1]
3(c)(ii)[1]
3(d)[1]
3(e)[1]
3(f)[2]
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