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Question: The geometric and aerodynamic data for a wing of a large white butterfly is as follows: Flight speed, U∞ = 1.35 m/s; average chord, c = 25 mm; average span, s = 50 mm; air density = 1.2 kg/m3; air viscosity, µ = 18 × 10-6 Pa/s; drag at zero lift = 120µN (measured on a miniature wind-tunnel balance). Estimate the boundary-layer thickness at the trailing edge. Also compare the measured drag with the estimated skin-friction drag. How do you account for any difference in value?
It is proposed that future space stations create an artificial gravity by rotating. Find what rotation period will provide gravity
Which of the following oscillators is suitable for frequencies in the range of mega hertz?
A stunt pilot is attempting to drop a water ballon from a moving air plane onto a target on the ground. the plane moves at a speed of 79.69 m/s and a 39 above the horizontal when the ballon is released. at the point of release the plane is at an alti..
The wheels of a wagon can be approximated as the combination of a thin outer hoop, of radius rh = 0.209 m and mass 5.65 kg, and two thin crossed rods of mass 9.95 kg each. what should the radius of the disk be
A blacksmith heats a horseshoe (.25 kg iron) to an average temperature of 700oC. After working it on an anvil, he plunges it into five gallon bucket of water (at20 oC). Assuming that minimal energy is lost by boiling the water, what is the final temp..
A 10.0 g bullet traveling horizontallt at 755 m/s strikes astationary target, What is the average force of the target on the bullet
An initially stationary 1.3 kg object accelerates horizontally and uniformly to a speed of 17 m/s in 3.0 s. What is the instantaneous power due to that force
How high from the surface of the earth must an object be raised, What minimum speed is needed by the object to ascend to this height
A banana contains about 430mg of potassium, of which 0.0117% is the radioactive isotope 4019K. Estimate the activity of an average banana due to 40/19K
The angle of refraction for a ray of light traveling through an ice cube is 35 degrees, now suppose the ice melts, but the angle of refraction remains the same, is the corresponding angle of incidence greater than, less than, or the same as it was ..
An open-open organ pipe is 67.9 cm long. AN open-closed pipe has an essential frequency equal to the third harmonic of the open-open pipe. How long is the open-closed pipe.
It bounces off with the same speed and angle. If the ball is in contact with the wall for 0.2 s, illustrate what is the average force exerted on the ball by the wall
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