In the Figure,the Ends of the Two Rods Are Separated $\circ$

question 49

Multiple Choice

In the figure,the ends of the two rods are separated by X at 25 ^$\circ$ C.The left rod is brass and 1 m long,whereas the right rod is steel and 1 m long.The rods just make contact with each other when they are both heated to 201ºC.Assuming that the far ends of both rods rest firmly against rigid wooden supports,what was their initial separation,X?

• A)5.0 mm
• B)7.5 mm
• C)4.7 mm
• D)5.6 mm
• E)6.3 mm

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