Example 3: By making measurements around a source (an engine exhaust pipe) it is found that the sound field is largely omni-directional at low frequency (in the range of 50 to 200 Hz). If the sound pressure level measured on a spherical surface 10 m from the source at 100 Hz is found to be 60 dB, what are the sound power in watts and sound power level at the 100 Hz frequency? lom.

Example 3: By making measurements around a source (an engine exhaust pipe) it is found that the sound field is largely omni-directional at low frequency (in the range of 50 to 200 Hz). If the sound pressure level measured on a spherical surface 10 m from the source at 100 Hz is found to be 60 dB, what are the sound power in watts and sound power level at the 100 Hz frequency? lom.

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

MIME3101 Applied Mecha Example 2.4 A stone is dropped into aiwell and the sto qot sli rt sound of splash (the sound of water hitting (s) sniiob l the water) is heard in 4 seconds. Find thelnte lied sdi doulw depth of the well, assuming the velocity of sound as 335 m/s. [h = 70.46 m] roitom noitenolaooe tn D ng up at a specd Sol
flued mechanics The inclined manometer at Fluid Dynamic laboratory at E5 has broken. You are tasked to design a new inclined manometer as shown in Figure 1. The design task is to decide what is the proper manometric fluid to be used, angle of inclination (θ), and the length of the vertical (L1) and inclined (L2) leg of the manometer. Since the manometer is mainly used together with Pitot-Static tube to measure air velocity it needs to be sensitive to a small pressure difference which in the range of 5 to 50 Pa. It should be notice that the manometer should fit in a compartment which has 15 cm-height and 80 cm-length. The inclination angle should be at least 5°. The temperature in the lab is around 27 °C to 37 °C. The manometric fluid should fulfil the following criteria: The fluid should have a low vapour pressure (A liquid with high vapour pressure would be less sensitive to changes in pressure) The fluid should have low surface tension to avoid the capillary rise. High boiling…
Here are these questions if I could get help with themIf a spherical storage tank holds 40,000 gallons (120,000 liters) of water,what diameter must it have?If a cylindrical storage tank has a 40-foot (12 m) diameter circular 05::=how high must it be to hold 1 million gallons (3 million liters)?If water is moving at a rate of 3.2 ft3/sec (90,000 cc/sec), how manygallons (liters) per minute is this?If the specific gravity of gold is 19.0. what is the weight of a cubic inch(cubic centimeter) of gold? A cubic foot (cubic meter)?
In the given image, both fluids are at 20°C. The specific weight of water is 9790 N/m³. If surface tension effects are negligible and a = 8.35 cm, what is the density of the oil, in kg/m³? Oil 6 cm Water Numeric Response CO 10 cm
Help with MATLAB code to convert decibels of aircraft noise to acoustic intensity. LCPeak (dB) 133 126 119 119 127 124
Problems Chapter 17 of "Physics for Scientists and Engineers", 10th ed. by Serway and Jewet. Two sound waves arrive at your ear simultaneously; they have slightly different frequencies: wi and w2 and equal amplitudes. You hear the loudness oscillate sinusoidally; this is what we refer to as "beats". Show that the total sound wave has the the form: P(t) = Patm + 28P cos((w1 - w2)/2) cos((w1 + w2)/2). (1) e, bimagination Cosl lWi-We) + Cos/ (W,+We)+ Real puth Releiter Reterort ot above expussion Real purts Coslwit) + Cos (We t)
The Reynolds number is a dimensionless group defined for a fluid flowing in a pipe as Re = Duplu where Dis pipe diameter, u is fluid velocity, p is fluid density, and u is fluid viscosity. When the value of the Reynolds number is less than about 2100, the flow is laminarthat is, the fluid flows in smooth streamlines. For Reynolds numbers above 2100, the flow is turbulent, characterized by a great deal of agitation. Liquid methyl ethylketone (MEK) flows through a pipe with an inner diameter of 2.067 inches at an average velocity of 0.48 ft/s. At the fluid temperature of 20°C the density of liquid MEK is 0.805 g/cm? and the viscosity is 0.43 centipoise [1 cP = 1.00 x 10-³ kg/(m-s)]. Without using a calculator, determine whether the flow is laminar or turbulent. Show your calculations.
3) A piece of machinery is placed in the corner of a manufacturing area (to get it as far away from as many people as possible). If the machinery is generating 96 dB of sound power, what sound pressure level would be experienced my someone standing 1 meter from the machine? (Assume no correction is necessary for atmospheric temperature or pressure). dB for 25 minutes:
A pitot-static tube to be used in 2n airplane for on-flight measurement was calibrated on ground by using air of density 1.20 kg/m? . A measurement taken at an altitude of 3000 m where the ambient pressure and density were 70 kPa (abs) and 0.91 kg/m? respectively, indicated a velocity of 200 m/s by using the above ‘ground level calibration. Estimate the true speed of the airplane [Take k = 1.4 2nd R = 287 J(kg K
B2) An automotive engine can be assumed as rectangular block with approximation size 0.4 m high, 0.6 m wide, and 0.7 m long as shown in Figure 6. The ambient air is at 1 atm and 15°C where air density (P) = 1.225 kg/m and kinematic viscosity (v) = 1.47x105 m2/s. Air 85km/h 15°C Engine Block Figure 6 a) Calculate the friction coefficient (C) and investigate the force acting on the bottom surface of the engine block as the car travels at the velocity of 85 km/h. Assume the flow to be turbulent (Cr = 0.074/Re5) over the entire surface because of the constant agitation of the engine block. b) An engine oil at 40°C with kinematic viscosity (v) = 2.485×104 m³/s is flowing over a long flat plate with velocity of 4 m/s. Determine the critical distance xer from the leading edge of the plate where the flow become turbulent (Recr = 5x105), and analyze the thickness of the boundary layers over a length of 2xer. Given boundary layer thickness for laminar flow is, öx = 4.91x/Re,2 and turbulent flow,…
th h 12 O mirst nown th Show the world Given h= 13.13 m Find centeral area and report I and Y unit [m]. +AG 21
i just need final answer A coaxial capacitive sensor is desired to measure the water level in a water tank. The coaxial sensor with a length of d=32 cm has an inner radius of a=9 mm and an outer radius of b=12 mm. Since the total capacitor value is measured at the sensor output 4.03 nF, the water level l =? Calculate (Note: It is known that the water temperature in the tank is 20 degrees. The variation graph of the relative dielectric constant with temperature is also given below.)a- 15cm b- 12cm c- 21cm d-18cm e- 26cm