Physics, 27.11.2019 20:31 ryliefitz32
Amodel propeller 1 m in diameter is tested in a wind tunnel. air approaches the propeller at 50 m=s when it rotates at 1800 rpm. the thrust and torque measured under these conditions are 100 n and 10 nm, respectively. a prototype eight times as large as the model is to be built. at a dynamically similar operating point, the approach air speed is to be 130 m=s. calculate the speed, thrust, and torque of the prototype propeller under these conditions, neglecting the effect of viscosity but including density
Answers: 2
Physics, 21.06.2019 19:30
Molten iron fills a mould, which has a volume of 200 cm cubed. calculate the volume when the iron cools and solidifies.
Answers: 1
Physics, 22.06.2019 11:50
Two resistors r1 and r2 may be connected either in series or parallel across an ideal battery with emf ε. we desire the rate of energy dissipation of the parallel combination to be 8.75 times that of the series combination. if r1 = 105 ω, what are the (a) smaller and (b) larger of the two values of r2 that result in that dissipation rate?
Answers: 2
Physics, 22.06.2019 14:30
Exercise 2. find the wavelength of a photon emitted when an electron jumps from the n = 3 energy level down to the n = 2 energy level. where is this photon in the electromagnetic spectrum?
Answers: 3
Amodel propeller 1 m in diameter is tested in a wind tunnel. air approaches the propeller at 50 m=s...
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