- #1
Ryan231
- 14
- 0
Ive been trying this one for a little while now and keep getting myself stumped here... So the question is...
A person sees a heavy stone strike the concrete pavement. A moment later two sounds are heard from the impact: one travels in air and the other in the concrete, and they are 1.4 s apart. How far away did the impact occur? (the speed of sound in concrete is about 4000 m/s)
So far I've got...
VConcrete = 4000m/s
VAir = 349 m/s
I've come up with a model that basically has 3 variables...
D1 = total distance
D2 = distance from rock hitting ground to 1.4s mark
D3 = 1.4s mark to person
Ive found that
Dconcrete = 4000*1.4 = 5600m
Dair = 349*1.4 = 488.6m
So I need to find D2 and D3 Lengths using the above somehow , D3 takes 1.4s for the slower sound, which would be the sound moving through the air.
d3 = 1.4s D2 =?
Person l______________l_________Rock
l_______________________l
D1 = total disance
My diagram got screwed by autoformatting.. everything is shifted to the right
A person sees a heavy stone strike the concrete pavement. A moment later two sounds are heard from the impact: one travels in air and the other in the concrete, and they are 1.4 s apart. How far away did the impact occur? (the speed of sound in concrete is about 4000 m/s)
So far I've got...
VConcrete = 4000m/s
VAir = 349 m/s
I've come up with a model that basically has 3 variables...
D1 = total distance
D2 = distance from rock hitting ground to 1.4s mark
D3 = 1.4s mark to person
Ive found that
Dconcrete = 4000*1.4 = 5600m
Dair = 349*1.4 = 488.6m
So I need to find D2 and D3 Lengths using the above somehow , D3 takes 1.4s for the slower sound, which would be the sound moving through the air.
d3 = 1.4s D2 =?
Person l______________l_________Rock
l_______________________l
D1 = total disance
My diagram got screwed by autoformatting.. everything is shifted to the right