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Tutorial ID | Title | Tutorial | Video Tutorial | Revision Notes | Revision Questions | |
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13.2 | Thermal Expansion |
1) A long nickel bar elongates by 3 mm when its temperature increases by 130 K. What was the original length of the bar if the coefficient of linear expansion for nickel is 13 × 10-6 K-1?
Correct Answer: C
2) The coefficient of thermal expansion for nylon is 100 × 10-6 K-1. How many square centimeters a nylon cloth of area equal to 0.4 m2 will shrink if the environment's temperature decreases by 20°C?
Correct Answer: D
3) A bimetallic strip (at 20°C) made of one platinum and one gold bar of equal lengths is shown in the figure below.
The linear coefficient of thermal expansion for gold is 14.2 × 10-6 K-1 and that of platinum is 9 × 10-6 K-1. What is the shape of the bimetallic strip when it cools down to -40°C?
Correct Answer: C
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