Solids aren’t as solid as we sometimes think. When enough force is applied, soli

Question

Solids aren’t as solid as we sometimes think. When enough force is applied, solids can be deformed. When solids are heated, they will typically expand as the average kinetic energy of the individual atoms increases. This lab focuses on this thermal expansion.

1. (4 pts) The linear coefficient of thermal expansion for concrete is 12x10-6 oC-1 (Table 12.1 in Cutnell and Johnson 6th Edition). Consider a slab of concrete which is 4.0 m long at 0.0 oC. What is the change in length if the temperature is increased to 77 oF? (Note that a conversion is necessary here) Show your work

2. (1 pt) What seems to be the primary safety concern in the lab?

3. (1 pt) Why should you pay close attention to the dial gauge when the rod is expanding?

Explanation / Answer

relation between celsius and fahrenheit scales is

C/5 = (F-32)/9

C/5 = (77-32)/9

C = 25 degrees celsius

change in length is dl = alpha*l1*dT = 12*10^-6*4*(25-0) = 12*10^-4 m = 1.2 mm

2) we need o use good working thermometers and insulatinmg gloves

3) since the change in length is so small so we needto pay much attension to the dial gauge when the rod is expanding

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.