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
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Transcribed Image Text:3. A badly designed electronic device has
two bolts that almost touch each other, as
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 µm
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
(8.5 x
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 x 10-6 K-1
Linear coefficient of thermal expansion of brass = 19 x 10-6 K-1
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