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Question: 1. If an aircraft of wing area S and drag coefficient CD is flying at speed V in air of density ρ, and if its single airscrew, of disc area A, produces a thrust equal to the aircraft drag, show that the speed in the slipstream is, on the basis of Froude's momentum theory,
2. A cooling fan is required to produce a stream of air 0.5 m in diameter with a speed of 3 ms-1 when operating in a region of otherwise stationary air of standard density. Assuming the stream of air to be the fully developed slipstream behind an ideal actuator disc, and ignoring mixing between the jet and the surrounding air, estimate the fan diameter and power input required.
A submarine of mass 2.1x 103 kg and initially at rest firesa torpedo of mass 260 kg. The torpedo hasan initial speed of 100.1 m/s. What is the initial recoil speed of the submarine in m/s?
308 moles of helium at 7.45 x 105 Pa are held at 158 C. What is the volume in m3
The two plates of a capacitor hold +8500 mC on the top plate and the same but opposite charge on the bottom plate when the potential difference is 220 Volt. Determine what is the capacitance in farads
A string with a mass per length of 2.00 gm/m is stretched with a force of 120 N between two points that are 0.400 m apart. What is the length of the organ pipe
A tennis player receives a shot with the ball (0.060 0 kg) traveling horizontally at 53.5 m/s and returns the shot with the ball traveling horizontally at 39.0 m/s in the opposite direction. What work does the racquet do on the ball
q1. a coiled telephone cord forms a spiral with 56 turns a diameter of 1.30 cm and an unstretched length of 60.0 cm.
Susan, driving north at 45 mph, and Shawn, driving east at 50 mph, are approaching an intersection. Find Shawn speed relative to Susan reference frame
1. - discuss the transient and steady states of a dc circuits response to a step input.2. -what components must be
A 8.80-g bullet has a speed of 1.17 km/s. What is the bullet's kinetic energy if its speed is halved
An airplane is dropping bales of hay to cattle stranded in a blizzard on the Great Plains. The pilot releases the bales at 140m above the level ground when the plane is flying at 80.0m/s 45.0 degrees above the horizontal. How far in front of the catt..
Consider a capacitor created when two identical conducting plates are placed parallel and close to each in other in vacuum, what is the magnitude of the electrostatic force between the charged plates, Is the force attractive or repulsive
Velocity selector of a mass spectrometer use fields of 10 N/C and 0.012 T to set the speed of certain 16x10^-19C particle, then the particle enters the second field of 0.5 T. Here it makes 30cm . find the speed of the particle as it enters the seco..
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