Example 4 The jet engines on a Boeing 757 must develop a certain amount of power to propel the airplane through the air with a speed of 320 km/h at a cruising altitude of 5,000 m. By what percent must the power be increased if the same airplane were to maintain its 320 km/h flight speed at sea level?

Example 4 The jet engines on a Boeing 757 must develop a certain amount of power to propel the airplane through the air with a speed of 320 km/h at a cruising altitude of 5,000 m. By what percent must the power be increased if the same airplane were to maintain its 320 km/h flight speed at sea level?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

2. The total temperature and total pressure (absolute) in the reservoir of a converging-diverging high-speed wind tunnel are 500K and 3x10 Pa, respectively. The throat area is 25 cm² and the Mach number in the test section is 3.0. Find the test section area in cm2, mass flowrate in kg/s, pressure in Pa, temperature in K, and air speed in m/s in the test section.
QUICKLY AND CORRECTLY PLEASE While the pressure remains constant at 100 psia the volume of a system of air changes from 20 ft3 to 10 ft3 . What are (a) change of internal energy (or ∆U) in Btu, (b) the heat transfer (or Q) in Btu, (c) the nonflow work (or Wn) in Btu.
Fluid mechanics
You and a friend plan to throw one end of a hose over a tall fence to siphon water from your side to the other side. Your friend says it doesn't matter how high the fence is, it will always work as long as your end of the hose is higher than the other side. However, you remind him that isn't actually true. What is the potential problem and about how high can the fence be (in meters) before it becomes an issue?
Wind provides an increasingly important source of renewable energy in certain locations of the world. In fact, wind was the second largest renewable energy source worldwide (after hydropower!) and provided more than six percent of global electricity in 2020; in the U.S. that number was 8.4%. Suppose that wind turbines can convert up to 30% of the kinetic energy of incoming wind blowing through their blades into electricity (i.e., useful shaft work). In the following, we will analyze the power output of a wind turbine with a diameter of d 80 m placed at an offshore location where the wind blows steadily at an average speed of 20 knots. Explicitly state all relevant approximations or assumptions. = (a) Draw a diagram that includes appropriate elements for assessing the amount of work extracted from the wind turbine. Your diagram should have annotated any known or approximated proper- ties. What is your system and surroundings? What kind of boundary divides these two? Hint: In terms of…
Spitting cobras can defend themselves by squeezing muscles around their venom glands to squirt venom at an attacker. Suppose a spitting cobra rears up to a height of 0.520 m above the ground and launches venom at 2.80 m/s, directed 57.0° above the horizon. Neglecting air resistance, find the horizontal distance (in m) traveled by the venom before it hits the ground.
Please solve this question as soon as possible, thank you.
A turbine model has the following characteristics: Effective power: 13, 6 kW; Rotor Diameter: 0.38 meters, Flow: 0.34 ms, Energy Jump: 26.5 J / Kg and 3 R.P.S. rotation It is desired to construct a geometrically similar 1.20 meter diameter turbine that provides a power on the 656 kW axis, we ask: to calculate and justify its answers: a) the specific rotation; b) the unit quantities (rotation, flow and power); c) the rotation, flow and power of the model (bi-unit quantities).
Determine the velocity required for take off for an aircraft with the following characteristics.Aircraft mass: 7200 kgWingspan: 15 mWing shape: rectangularWing chord length: 1.8 mWing airfoil: NACA 4415Wing angle of attack: 7× 0.5 + 5 degreesHint: Check NACA charts for required parameters.
Please help, please don't round off the answer (exact number needed)
If 10 m^3 of atmospheric air at 1 degree centigrade temperature are compressed to a volume of 1m^3 at 100°C, what will be the pressure of air?
A model rocket has engine with an average thrust of 2.82 N. The rocket mass is 71.5 g, which includes fuel mass 27.3 g. The duration of fuel burning is 2.52 s. What is the final speed vf of this rocket if it were to be fired from International Space Station with initial speed vi=7660 m/s? Assume the fuel burns at a constant rate.