- #1
Karol
- 1,380
- 22
Homework Statement
A steel pipe of length 60m is hit at one side. a man standing at the other side hears 2 sounds, one that passes in the pipe and one through the air. what is the time difference.
Take the modulus of elasticity as 2,180,000[kgf/cm2]
Homework Equations
Velocity in the pipe: ##u=\sqrt{\frac{E}{\rho}}##
The Attempt at a Solution
I assume the specific mass: 8[gr/cm3]=0.008[kg/cm3]=0.0008[hyl/cm3]
$$u=\sqrt{\frac{2,180,000}{0.0008}}=52,202[cm/sec]=522[m/sec]$$
$$\delta v=522-346=176$$
$$60=176\cdot t\rightarrow t=0.34[sec]$$
It should be 0.16[sec]