A steel bar with a cross-sectional area of 1.00 × 10-4 m2 is heated to 100°C and then it is clamped at both ends with clamps that are 2.0 m apart
When the bar cools to 20°C what is the force exerted by the bar on the clamps? The coefficient of thermal expansion of steel is 12 × 10-6 K-1 and Young's modulus for steel is 20 × 1010 N/m2. A) 1.9 × 104 N
B) 3.8 × 104 N
C) 1.9 × 103 N
D) 3.8 × 103 N
E) 1.9 × 105 N
A
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