A badly designed electronic device has two bolts that almost touch each other, as D shown in Figure 2. One bolt is made of steel and has length Ls = 0.01 m. The other bolt is made of brass and has length L, = 0.03 m. When the device is at a temperature of 30 °C, the gap between the two bolts is d = 8.5 um (8.5 x 10-6m). As the device temperature rises, the bolts expand and the gap becomes smaller. At what temperature will the bolts touch? In other words, calculate the temperature Steel Brass Ls Lp d Figure 2 at which the bolts make contact with each other. Assume that the distance D between the two walls remains constant. You may need the following information: Linear coefficient of thermal expansion of steel = 11 × 10-6 K-1 Linear coefficient of thermal expansion of brass = 19 x 10-6 K-1 %3D

A badly designed electronic device has two bolts that almost touch each other, as D shown in Figure 2. One bolt is made of steel and has length Ls = 0.01 m. The other bolt is made of brass and has length L, = 0.03 m. When the device is at a temperature of 30 °C, the gap between the two bolts is d = 8.5 um (8.5 x 10-6m). As the device temperature rises, the bolts expand and the gap becomes smaller. At what temperature will the bolts touch? In other words, calculate the temperature Steel Brass Ls Lp d Figure 2 at which the bolts make contact with each other. Assume that the distance D between the two walls remains constant. You may need the following information: Linear coefficient of thermal expansion of steel = 11 × 10-6 K-1 Linear coefficient of thermal expansion of brass = 19 x 10-6 K-1 %3D