The sound level, B. In decibels (dB), of a sound with an intensity of I is calculated in relation to the threshold of human hearing, I0, by this equation
B = 10log(i / i0)
The threshold of human hearing is 10^-12
watts/meter?
The sound level of a Jet plane is approximately 140 dB. The intensity of the sound of a Jet plane is approximately ?
watts/meter^2?

4.6875 pounds

step-by-step explanation:

19.side- angle- side

20. angle- side- angle

step-by-step explanation:

step-by-step explanation:

geometry: triangles

solvers

lessons

answers archive

call the larger triangle abc

then the smaller triangle cde is similar to abc (all angles are equal, aaa).  

ab is the side that is 36, and we wish to find de, the side corresponding to ab

area_cde = area_abc - area_cde --> area_abc / area_cde = 2

let x=length of de

ratio of areas = (ratio of sides)^2

+2+=+%2836%2fx%29%5e2+

+2+=+1296%2fx%5e2+

++x%5e2+=+1296%2f2+=+648+

25.45584