A Cylindrical Tank Is Assembled by Welding Steel Sections in a Heli-

question 73

Short Answer

A cylindrical tank is assembled by welding steel sections in a heli- cal pattern with angle $\alpha=50^{\circ}$ . Tank diameter is 1.6 m, thickness is
20 mm, and internal pressure is 2.75 MPa. Modulus E = 210 GPa and
Poisson's ratio $v=0.28$ . The normal stress acting perpendicular to the
Weld is approximately: (A) $39 \mathrm{MPa}$
(B) $48 \mathrm{MPa}$
(C) $78 \mathrm{MPa}$
(D) $84 \mathrm{MPa}$

---

Definitions:

Hourly Wages

The rate of pay employees receive for one hour of work.

Market Equilibrium

A state in a market where supply equals demand, resulting in stable prices and no tendency for change until external factors impose it.

Market Wage Rate

The prevailing pay rate for a specific job in a specific market or industry, determined by supply and demand.

Generous Pension Plan

A retirement plan that offers higher than average benefits to employees, often providing significant income in retirement.