Exam 1 Practice Problems WITH Answers

# A 10 cm bimetallic strip made of aluminum and copper

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14. A 10 cm bimetallic strip made of aluminum and copper is shown below. The copper, which has a linear expansion coe ffi cient , lies above the aluminum, which has . The strip stays flat at 20°C. When heated to 220°C, the strip a. remains flat, but becomes longer. b. remains flat, but becomes longer. c. remains flat, but becomes longer. d. forms an arc with the ends curling upward. e. forms an arc with the ends curling downwards. 15. Astronauts land on a previously unknown planet and find that its surface is a pure metal. When they take a 1.0000 m long sample at the planetary temperature of 30.00°C and heat it to 100.00°C, they find that it changes length by +0.98 mm. They conclude that the planet is made of 16. A 150 lb. runner moving horizontally uses energy at the rate of 670 cal/lb/mile. How many calories would the runner need to run a 10 mile race? Dr. Cyril Anoka’s Exam one Review

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17. A 0.500 kg copper cup is at 280 K. If of energy is added to it, what is its final temperature in K. The specific heat of copper is . 18. A 25 g lead bullet at 0°C moves at 375 m/s and strikes a block of ice at 0°C. What quantity of ice in kg is melted if all of the kinetic energy of the bullet is converted to heat? The block of ice does not move. (The latent heat of fusion of ice is 80 kcal/kg and the specific heat of lead is . ) a. b. c. d. e. 19. A simple pendulum having a length of 2 meters and a mass of 5 kg is pulled 30°from the vertical and released. If it is allowed to swing until it comes to rest, how much energy in J is converted into thermal energy? 20. A 5 kg piece of lead (specific heat ) having a temperature of 80°C is added to 500 g of water having a temperature of 20°. What is the final equilibrium temperature in °C of the system? 21. Two kg of water at 100°C is converted to steam at 1 atm. Find the work done in J. (The density of steam at 100°C is . 1 atm .) 22. If the same amount of thermal energy is added to each of two di ff erent masses of water, a. the smaller mass of water will have the greater temperature increase. b. the larger mass of water will have the greater temperature increase. c. they both will have the same temperature increase. Dr. Cyril Anoka’s Exam one Review
d. their temperature will not increase unless they are in contact. e. none of the above will happen.

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