The average power output of a speaker is 4.71 W. How loud are 6 of these speaker

Question

The average power output of a speaker is 4.71 W. How loud are 6 of these speakers at a distance of 6 m? (in dB) 4.17 pts, 100% # tries: 0 Show Details 296 try penalty Hints: 0,0 A train whistle has a frequency of 280 Hz and is approaching a crossing at 35 m/s. You are driving in a car on a road parallel to the track and are approaching the crossing from the opposite direction with a speed of 33 m/s. The air temperature is 30 °C. What frequency do you hear? (include units with answer) 4.17 pts. 100% # tries: 0 Show Details Format Check 296 try penalty Hints: 1,1 The EF 158 class decides to conduct an experiment in which they build a boat out of aluminum foil and see how many students can fit into thee boat along side their 3.61 slug professor before it sinks into the Tennessee River. They use 68 rolls of aluminum foil (3.6 lb/roll) to build a Forat Check box shaped boat with dimensions of 4.6 x 7.6 x 4.0 ft. If the prof plus 21 students cause the boat to just start to sink, what is the average mass of an EF 158 student? (include units with answer) 4.17 pts. 100% C. # tries: 0 show Details 296 try penalty Hints: 1,1 A 0.24 inch diameter hole is punched in the bottom of a 1.7 inch diameter can. The can is open at the top and contains 13 oz of liquid. What is the initial velocity of the liquid coming out of the hole? (include units with answer) 4.17 pts, 100% # tries: 0 Show Details Format Check 290 try penalty Hints: 1,1

Explanation / Answer

(A) P = 4.71 W  

I = P / (4 pi r^2)

I = (4.71) / (4 x pi x 6^2) = 0.0104 W/m^2

due to 6 speakers, I = 6 x 0.0104 = 0.0625 W/m^2

sound level = 10 log(I / I0)

=10 log(0.0625 / 10^-12)

= 108 dB

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