The sound produced by a jet engine was measured at a distance of 100 m in all directions. The loudness d of the sound (in decibels) was found to be d = 70.0 + 30.0 cos, where the 0 line was directed in front of the engine. Calculate d for = 54.5.
Chapter 4, Exercises 4.3 #58
The sound produced by a jet engine was measured at a distance of 100 m in all directions. The loudness d of the sound (in decibels) was found to be d = 70.0 + 30.0 cosθ, where the 0° line was directed in front of the engine. Calculate d for θ = 54.5°.
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Related Book For 
Basic Technical Mathematics
12th Edition
Authors: Allyn J. Washington, Richard Evans
ISBN: 9780137529896