Consider a Lear jet flying at a velocity of 250 m/s at an altitude of 10 km. where the density and temperature are
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Fundamentals of Aerodynamics
- A block of mass 4.0 kg moves horizontally on a film of crude oil at 30°C. The contact area of the undersurface is 0.06 m². If initially the block has a speed of 3.0 m/s, find the speed after 1 s. Dynamic viscosity of crude oil at 30° is 1.65 x 10-3 Pa.s. The oil film thickness below block is 0.3mm.arrow_forwardThe P-35 experiences a certain dynamic pressure at its cruising speed of 114.2 m/s at an altitude of 4 km. Now assume the P-35 is flying at sea level. At what velocity must it fly at sea level to experience the same dynamic pressure?arrow_forwardAn air-hockey puck has a mass of 50 g and is 9 cm in diameter.When placed on the air table, a 20 °C air film, of0.12-mm thickness, forms under the puck. The puck isstruck with an initial velocity of 10 m/s. Assuming a linearvelocity distribution in the air film, how long will it takethe puck to ( a ) slow down to 1 m/s and ( b ) stop completely?Also, ( c ) how far along this extremely long table will thepuck have traveled for condition ( a )?arrow_forward
- The SR-71 Blackbird, which is 107 feet 5 inches long, is the world’s fastest airplane. It can fly at three times the speed of sound (Mach 3) at altitudes of 80,000f t. When it lands after a long flight it is too hot to be touched for about 30 minutes, and is 6.0 inches longer than at takeoff. How hot is the Blackbird when it lands, assuming its coefficient of linear expansion is 2.4 × 10−5K−1 and its temperature at takeoff is 23oC?arrow_forwardCOnsider an airplane flying at a standard altitude of 6km with a velocity of 330m/s. At a point on the wing of the airplane, the velocity is 400m/s. Calculate the pressure at this point. Cp=1008 j/kgK. answer should be in metric. and detailed solution.arrow_forward(b) A Formula 1 team tests their car in a wind tunnel at a scale of 50%, at a speed of Vwinarunnet = 50 m/s. The measured downforce at this speed is Foownforce.WT = 3000 N and the model reference area is Aref wT = 0.5 m?. 1. Find the downforce magnitude on the full-scale race car at the same Reynolds number. Assume constant air density p = 1.2 kg/m. II. It is said that F1 cars could travel upside down, as shown below. At what speed should the full-scale car travel to achieve this, if its mass is m = 740 kg? The acceleration of gravity is g = 9.81 m/s?. Downforce Weightarrow_forward
- Consider the Space Shuttle during its atmospheric entry at the end of amission in space. At the altitude where the Shuttle has slowed to Mach 9,the local heat transfer at a given point on the lower surface of the wing is0.03 MW/m2. Calculate the normal temperature gradient in the air at thispoint on the wall, assuming the gas temperature at the wall is equal to thestandard sea-level temperature.arrow_forwardAn airplane is flying at a velocity of 150 m/s at standard sea-level conditions. The temperature at a point on the wing is 270K. What is the pressure and velocity at that point? For air, C, = 1008- %3D kg Karrow_forwardVelocity profiles are measured at the upstream end and at the downstream end of a control volume as shown in H Figure. The maximum velocity at the inlet and at the outlet is the same V=Vmax. =3m/s. The velocity profile at the inlet is uniform, while the velocity profile at the outlet is linear as shown in figure. If the fluid is air, with p=1.22 Kg/m³ and H=1m, calculate the drag per unit length on the wall.arrow_forward
- Find the force acting on a submarine with a speed of 1.5 km per hour. Consider the submarine as a cylinder with a diameter of 2m and a length of 10m. µwater = 0.9142 x10-3 Pa s, pwater= 997.2kg/marrow_forwardAn automobile has a characteristic length and area of 8 ft and 60 ft2, respectively. When tested in sea-level standard air, it has measured velocities of 20, 40, and 60 mi/h and drag forces of 31, 115, and 249 lbf, respectively. The same car travels in Colorado at 115 mi/h at an altitude of 3500 m. Using dimensional analysis, estimate its drag force (in lbf). Using dimensional analysis, estimate the horsepower required to overcome air drag (in hp)arrow_forwardA square block weighing 1.1 kN and 250 mm on an edge slides down an incline on a film of oil 6 micrometer thick. Assuming a linear velocity profile in the oil and neglecting air resistance, what is the terminal velocity of the block in m/s? The viscosity of oil is 7mPa-s and the angle of inclination is 20deg.arrow_forward
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