[نينوووو]

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10- A pair of eyeglass frames is made of epoxy plastic. At room temperature (20.0°C), the frames have circular lens holes 2.20 cm in radius. To what temperature must the frames be heated if lenses 2.21 cm in radius are to be inserted in them? The average coefficient of linear expansion for epoxy is .



11- Two concrete spans of a 250-m-long bridge are placed end to end so that no room is allowed for expansion (Fig. a). If a temperature increase of 20.0°C occurs, what is the height y to which the spans rise when they buckle (Fig. b). (The coefficient of linear expansion for concrete is )? {extra}




12- The temperature of a silver bar rises by 10.0°C when it absorbs 1.23 kJ of energy by heat. The mass of the bar is 525 g. Determine the specific heat of silver.

13- A 50.0-g sample of copper is at 25.0°C. If 1 200 J of energy is added to it by heat, what is the final temperature of the copper? (the specific heat of copper is )

14- A 1.50-kg iron horseshoe initially at 600°C is dropped into a bucket containing 20.0 kg of water at 25.0°C. What is the final temperature? (Ignore the heat capacity of the container), the specific heat of water is , and the specific heat of iron is ).