10-19. The 125-Hz sound power level (re: 10-12 W) from a jet engine test cell is 149 dB. What is the 125-Hz sound pressure level 1,200 m downwind on a clear summer morning during an inversion when the wind speed is 1.50 m/s, the temperature is 25.0°C, the relative humidity is 70.0 percent, and the barometric pressure is 101.3 kPa? The height of the engine and the receiver are 1.5 m. The ground surface characteristics are shown in Figure P-10-19. Asphalt Asphalt Grass 300 m 1,200 m Jet engine Grass 1.5 m 100 m 300 m 50 m FIGURE P-10-19 Ground surface characteristics for Problem 10-19. 40 m Grass- mutu 400 m • Receiver 10 m 1.5 m

10-19. The 125-Hz sound power level (re: 10-12 W) from a jet engine test cell is 149 dB. What is the 125-Hz sound pressure level 1,200 m downwind on a clear summer morning during an inversion when the wind speed is 1.50 m/s, the temperature is 25.0°C, the relative humidity is 70.0 percent, and the barometric pressure is 101.3 kPa? The height of the engine and the receiver are 1.5 m. The ground surface characteristics are shown in Figure P-10-19. Asphalt Asphalt Grass 300 m 1,200 m Jet engine Grass 1.5 m 100 m 300 m 50 m FIGURE P-10-19 Ground surface characteristics for Problem 10-19. 40 m Grass- mutu 400 m • Receiver 10 m 1.5 m

Residential Construction Academy: House Wiring (MindTap Course List)

4th Edition

ISBN:9781285852225

Author:Gregory W Fletcher

Publisher:Gregory W Fletcher

Chapter14: Branch-circuit Installation

Section: Chapter Questions

Problem 12RQ

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