At 20°C an aluminum ring has an inner diameter of 5.000 cm, and a brass rod has a diameter of 5.020 cm. Keeping the brass rod at 20°C, which of the following temperatures of the ring will allow the ring to just slip over the brass rod? (aAl = 2.4 × 10^-5 /°C, abrass = 1.9 × 10^-5/°C )
a. 111°C
c. 228°C
b. 187°C
d. 437°C
B
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