Chapter 12, Problem 55P

As an oil well is drilled, each new section of drill pipe support its own weight and the weight of the pipe and the drill bit beneath it. Calculate the stretch in a new $6.00-\text{m}$ -long steel pipe that supports a $100-\text{kg}$ drill bit and a $3.00-\text{km}$ length of pipe with a linear mass density of $20.0\text{kg}/\text{m}$ . Treat the pipe as a solid cylinder with a $5.00-\text{cm}$ diameter.