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Question: On the basis of Bernoulli's equation, discuss the assumption that the compressibility of air may be neglected for low subsonic speeds. A symmetric airfoil at zero lift has a maximum velocity that is 10% greater than the free-stream velocity. This maximum increases at the rate of 7% of the free-stream velocity for each degree of incidence. What is the free-stream velocity at which compressibility effects begin to become important (i.e., the error in pressure coefficient exceeds 2%) on the airfoil surface when the incidence is 5 degrees?
A fireman starts from rest with his feet 18.0 ft above the ground and slides down a pole with a downward acceleration of 10.0 ft/s2. How fast will he be going when his feet touch the ground
A 5.0 kilogram block is initially at rest on the surface of a smooth frozen lake. Mary applies a 7.0 N horizontal force directed North, Find the total horizontal force on the box
A 54.0 g sample of a conducting material is all that is available. The resistivity of the material is measured to be 11 10-8 ·m, What must be the diameter of the wire
two electric charges, eagh of+6.00μ C are placed at thecorners of the base of the square of the side s=8.50m. calculate the magnitude of the force on each of the charges
A flight attendant pulls hero 70 N flight bag a distance of 253 m along a level airport floor at a constant velocity. The force she exerts is 40N at an angle of 52.0 degrees above the horizontal.
A plastic rod is rubbed against a wool shirt, How many electrons are transferred from the wool shirt to the plastic rod? The elemental charge is 1.6 × 10?19 C
Boy is stands on a scale in an elevator that is accelerating upward. Scale reads 723.8 N. Find magnitude of the acceleration of the elevator
The gravitational force between two masses M and m seperated by a distance r is 40 N. What is the new force when this distance is halved
A wire 25.1 m long and 6.00 mm in diameter has a resistance of 15.0 m. A potential difference of 27.0 V is applied between the ends. Calculate the resistivity of the wire material
Find the resulting angular speed of the disk (in rad/s) and describe the direction of rotation.
A man stands on a platform that is rotating (without friction) with an angular speed of 1.0 rev/s; his arms are outstretched, What is the resulting angular speed of the platform
The drawing shows two situations in which charges are placed on the x and y axes. They are all located at the same distance of 6.1 cmfrom the origin O. For each of the situations in the drawing, determine the magnitude of the net electric field at..
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