Aluminum has a coefficient of linear expansion of 2.4x10^-5 c^-1 and a coefficient of volume expansion of 7.2x10^-5 c^-1. an aluminum wire at 20 degrees c has a length of 10 m and a cross-sectional area of 1 cm^2. it is then heated to 100 degrees c. what is the new length of the wire?

Asquare isothermal chip is of width w=5 mm on a side and is mounted in a substrate such that its side and back surfaces are well insulated; the front surface is exposed to the flow of a coolant at tinf=15 °c. from reliability considerations, the chip temperature must not exceed t=85 °c. if the coolant is air and the corresponding convection coefficient is h=200 w/m2 x k, what is the maximum allowable "power" of the chip? if the coolant is a liquid for which h=3000 w/m2 x k, what is the maximum allowable power of the chip?