Thrust to hold the helicopter in place
A 5300 kg helicopter hovers at a fixed height. The rotor blades send air downward at 62 m/s. What mass of air must pass through the blades every second to produce enough thrust to hold the helicopter in place?
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Derive a result for the frequency of the string if you know the tension (T), linear density (m), number of antinodes (n), and the length L?
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You make a primitive yo-yo by wrapping a massless string around a solid cylinder with mass M and radius R. You hold the free end of the string stationary and release the cylinder from rest. The string unwinds but does not slip or stretch as the cy
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