11. Metal lids on glass jars can often be loosened by running hot water over the

Question

11. Metal lids on glass jars can often be loosened by running hot water over them. Why does that work? 12. Suppose the volume of an ideal gas is doubled while the pres sure is reduced by half. Does the internal energy of the gas increase, decrease, or remain the same? Explain. 13. An automobile radiator is filled to the brim with water when the engine is cool. What happens to the water when the engine is running and the water has been raised to a high temperature? Figure CO10.14 shows a metal washer being heated by a Bun- sen burner The red arrows in options a, b, and c indicate the possible directions of expansion caused by the heating Which ption correctly illustrates the washer's expansion? Figure CO1014 Assign2, cq2 Tac Nam THURSDAY AT 9 49 PM Like Share

Explanation / Answer

(14) The answer is option (a) - The outer and inner radii, both will increase.

The reason is, when a metal is being heated, the inter-molecular separation increases (the density of the material decreases). In the option (b), the density of the material at the inner circle increases, and in option (c), remains constant. Both these options are incorrect as by applying heat, you are providing energy to the material which will increase the average kinetic energy of the molecules in the material and the over-all material expands.

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