Chapter 9, Problem 9.3.8P

A gold-alloy microbeam attached to a silicon wafer behaves like a cantilever beam subjected to a uniform load (see figure). The beam has a length L = 27.5 $\mu$ m and rectangular cross section of a width b = 4.0 $\mu$ m and thickness t = 0.88 $\mu$ m. The total load on the beam is 17.2 $\mu$N. If the deflection at the end of the beam is 2.46 $\mu$ m is what is the modulus of elasticity E_gof the gold alloy? (Use the formulas of Example 9-2.)