Thermal Expansion –Final

A copper wire is 3.0 meters long. It's heated from 20°C to 80°C. α = 17 × 10⁻⁶ /°C. What is the change in length?

• 3.1 × 10⁻³ m

• 1.5 × 10⁻³ m

• 5.1 × 10⁻³ m

• 9.2 × 10⁻³ m

A metal rod expands 2 mm when heated from 25°C to 125°C. If its original length was 2.5 m, what is the metal’s linear expansion coefficient?

• 8 × 10⁻⁶ /°C

• 2 × 10⁻⁶ /°C

• 1.6 × 10⁻⁵ /°C

• 4 × 10⁻⁶ /°C

An aluminum beam measures 4.5 m at 10°C. What will its length be at 60°C? α = 23 × 10⁻⁶ /°C

• 4.505175 m

• 4.500575 m

• 4.507500 m

• 4.504000 m

A steel tank holds 5000 mL of fluid. If heated from 25°C to 75°C, how much will the volume increase? β = 36 × 10⁻⁶ /°C

• 9 mL

• 1.8 mL

• 0.9 mL

• 18 mL

Tags

NGSS.MS-PS1-4

A gas container has a volume of 2.0 L at 20°C. If the temperature rises to 70°C and β = 9 × 10⁻⁵ /°C, what is the new volume?

• 2.009 L

• 2.018 L

• 2.090 L

• 2.900 L

6. Bridges have expansion joints built into them to:

• allow for expansion and contraction due to temperature changes

• make the bridge look more attractive

• reduce the weight of the bridge

• increase the height of the bridge

Tags

NGSS.MS-PS3-3

7. A jar lid may be easier to open after running hot water over it because:

• the metal expands, loosening the lid

• the glass contracts, tightening the lid

• the water lubricates the lid

• the air inside the jar escapes

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

If two metals with different coefficients of linear expansion are fused together and heated, what might happen?

• They will expand equally.

• They may bend or warp.

• They will contract.

• Nothing will happen.

Tags

NGSS.MS-PS3-4

What happens to the size of a hole in a metal plate when it's heated?

• It shrinks

• It stays the same

• It expands

• It collapses

Tags

NGSS.MS-PS1-4

Name a real-world application where thermal contraction (cooling down) is a problem engineers must account for:

• Bridges and railway tracks

• Solar panels

• Wind turbines

• Hydraulic presses

Tags

NGSS.HS-PS3-4