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Please check the answers given in the book for the following questions.
11. A metre scale of steel is caliberated at 20oC to give correct reading. Find the distance between 50cm and 51cm mark if the scale is used at 10oC.
Coefficient of linear expansion of steel = 1.1 x 10 -5.
Answer given : 1.00011cm. ( I think it should be 0.99989 cm. Shouldn't it decrease ?? )
27. A steel rod is clamped at its two ends and rests on a fixed horizontal base. The rod is unstretched at 20oC. Find the longitudinal strain developed in the rod if the temperature rises to 50oC.
Coefficient of linear expansion of steel = 1.2 x 10 -5.
Answer given : - 3.6 x 10 -4 . ( Why minus ?? )
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