Recent content by jdg

I used the constant, 1493 m/s, which is given in my text for SoS in fresh water, it came out wrong

so how do I find that speed with the given information?

so it doesn't matter what the frequency is, the speed of sound remains the same in the water?

the frequency won't change the speed in water?

I would think that at a constant temperature the speed would be constant?

I know it has something to do with the density of the medium, but I'm not sure what the equation is -the density of fresh water is 1000 kg/m3

A 190 Hz sound traveling in fresh water has speed of? I'm not sure which equations to use, or where to start. I tried wavelength = V/f , with V being constant, 1493 m/sAny help would be greatly appreciated!

Next question: A garden hose with internal diameter of 13.5 mm lies flat on a sidewalk while water is flowing in it at a speed of 6 m/s. A person happens to step on it at the very edge of the opening of the hose and decreases its internal diameter by a factor of 9 So D (1) = 0.0135m r (1) =...

Ok, for Q2, part 2 I did J = A(1)V(1) = A(2)V(2): So V2 = V1*(A1/A2) = 486 m/s Is this right? And for part 3 I did J = (A2)(V2) = 8.59e-4 m3/s

Next question: A garden hose with internal diameter of 13.5 mm lies flat on a sidewalk while water is flowing in it at a speed of 6 m/s. A person happens to step on it at the very edge of the opening of the hose and decreases its internal diameter by a factor of 9 So D (1) = 0.0135m r (1) =...

for Q2, part 2 I did J = A(1)V(1) = A(2)V(2): So V2 = V1*(A1/A2) = 486 m/s Is this right? And for part 3 I did J = (A2)(V2) = 8.59e-4 m3/s

ok, I got V = 0.003058... m = 23.975...

Ok, I got: Fair= mg = 30 N m = dV = (7840)(3.901e-4) =3.06 kg V = Fb/dg = (30 N) / (7840*9.81) = 3.901 m3 Next question: A garden hose with internal diameter of 13.5 mm lies flat on a sidewalk while water is flowing in it at a speed of 6 m/s. A person happens...

thanks a lot! you have time for one or 2 more?

ok, so for weight in air it would be 30 N + 30 N= 60 N? And the mass would be m = Fair/g or m = (Fair-Fb)/g?