Blood from an animal is placed in a bottle 2.0 m above a 3.4 cm long needle, of inside diameter 0.35 mm, from which it flows at a rate of 2.9 cm^3/min. What is the viscosity of this blood? Assume Pblood}=1.05 * 10^3 kg/m^3.
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if you exert a force of 500 N to walk 4 m up a flight of stairs in 4 s, how much power do you use?
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