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The military jet aircraft has a gross weight of 28,000 lb and is poised for takeoff with brakes set while the engine is revved up to maximum power. At this condition, air with a specific weight of 0.0753 lb/ft³ is sucked into the intake ducts at the rate of 112 lb/sec with a static pressure of -0.28 lb/in.² (gage) across the duct entrance. The total cross-sectional area of both intake ducts (one on each side) is 1630 in.² The air-fuel ratio is 16.2, and the exhaust velocity u is 2630 ft/sec with zero back pressure (gage) across the exhaust nozzle. Compute the initial acceleration a of the aircraft upon release of the brakes. Vo- Answer: a = i ft/sec²

The military jet aircraft has a gross weight of 28,000 lb and is poised for takeoff with brakes set while the engine is revved up to maximum power. At this condition, air with a specific weight of 0.0753 lb/ft³ is sucked into the intake ducts at the rate of 112 lb/sec with a static pressure of -0.28 lb/in.² (gage) across the duct entrance. The total cross-sectional area of both intake ducts (one on each side) is 1630 in.² The air-fuel ratio is 16.2, and the exhaust velocity u is 2630 ft/sec with zero back pressure (gage) across the exhaust nozzle. Compute the initial acceleration a of the aircraft upon release of the brakes. Vo- Answer: a = i ft/sec²

Elements Of Electromagnetics
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
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The military jet aircraft has a gross weight of 28,000 lb and is poised for takeoff with brakes set while the engine is revved up to maximum power. At this condition, air with a specific weight of 0.0753 lb/ft3 is sucked into the intake ducts at the rate of 112 lb/sec with a static pressure of -0.28 lb/in.² (gage) across the duct entrance. The total cross-sectional area of both intake ducts (one on each side) is 1630 in.² The air-fuel ratio is 16.2, and the exhaust velocity u is 2630 ft/sec with zero back pressure (gage) across the exhaust nozzle. Compute the initial acceleration a of the aircraft upon release of the brakes. Vo Answer: a = i u ft/sec²
Transcribed Image Text:The military jet aircraft has a gross weight of 28,000 lb and is poised for takeoff with brakes set while the engine is revved up to maximum power. At this condition, air with a specific weight of 0.0753 lb/ft3 is sucked into the intake ducts at the rate of 112 lb/sec with a static pressure of -0.28 lb/in.² (gage) across the duct entrance. The total cross-sectional area of both intake ducts (one on each side) is 1630 in.² The air-fuel ratio is 16.2, and the exhaust velocity u is 2630 ft/sec with zero back pressure (gage) across the exhaust nozzle. Compute the initial acceleration a of the aircraft upon release of the brakes. Vo Answer: a = i u ft/sec²
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