Question

can any1 help me with physics?

Answer 1

electro magnet waves, and how to solve problems.

Answer 2

ok

Answer 3

thanks :)

Answer 4

well the thing is i have approx 2 months left for a physics exam,

Answer 5

and i need to know the hole book, it is like 300 pages, of problems, examples etc etc

Answer 6

i do understand some of the chapters, but some of them like the problems

Answer 7

i see

Answer 8

the intensite level in a street is 70 db, what is the sound time rate of the energu entering a room trough a windows of area 3m^2 facing the street

Answer 9

this it the "sound" chapter

Answer 10

the window acts as a surface source, find the intensity of sound at the window,

Answer 11

then use the area of the window to find the total intensity in the room due to the window

Answer 12

70 = 10log I/10^-12 = I / 10^-12 = 7

Answer 13

something like that lol, buts is was to hard lol

Answer 14

sound rate of energy = 10^-5 watt/m2 x 3m^2 = 3x10^-5 watt....

Answer 15

no one that is good at this things? ill even pay trough paypal if ur good lol

Answer 16

then we have ac circuits, diffraction gratings, modern physics etc etc

Answer 17

"the intensite level in a street is 70 db, what is the sound time rate of the energu entering a room trough a windows of area 3m^2 facing the street"

70dB is the acoustic level. It is an arbitrary logarithmic scale for sound surface-power.

So sound intensity is \(I=10^{-7}\: Wm^{-2}\)

And power coming in through the window is \(P=3.10^{-5}W\)

Your answer was ok :)