Question

1. The temperature changes from 3S°F during the night to 75°F during the day. What is the temperature change on the Celsius scale? A)720 B)40°C Answer: D C) 32°C D) 22°C The coefficient of linear expansion of steel is 12 X 10-6 K', what is the change in length of a 25-m steel bridge span when it undergoes a temperature of 40 K? A) 1.2 cm Answer: A 2. B) 1.4 cm C) 1.6 cm D) 1.8 cm E) 2.0 cm 3. An ideal gas in a container of volume 100 cm at 20°C has a pressure of 100 N/m2. Determine the number of gas molecules in the container. A)2.4 x 106 B) 4.2 x 106 c) 6.0 x 103 D)2.5 X 101 E) 5.2X 1018 Answer: D 4. A 425-g piece of metal at 100C is dropped into a 100-g aluminum cup containing 500 g of water at 15°C. The final temperature of the system is 40°C. What is the specific heat of metal, assuming no heat is exchanged with the surroundings? The specific heat of aluminumis 900 J/(kg«K). A) 1900 J(kg.K) B) 2140 J/(kg.K) C) 3300 J(kg K) D) 3800 J/(kg.K) Answer: B 5. Two metal rods, one silver and the other gold, are attached to each other. The free end of the silver rod is connected to a steam chamber, with a temperature of 100°C, and the free end of gold rod to an ice water bath, with a temperature of 0 C. The rods are 5.0 cm long and have a square cross-section, 2.0 cm on a side. How much heat flows through the two rods in 60 s? The thermal conductivity of silver is 4 1 7 W/(m«K), and that of gold is 291 W/(m«K). No heat is exchanged between the rods and the surroundings, except at the ends. A) 8.2 KJ B) 9.5 KJ C) 12 KJ D) 14 KJ E) 16 KJ Answer: A 6. A liquid has a maximum density of 1 g/cm' at 4 C. At 10°C, its density is 0.9997 g/cm. What is β for this liquid over this temperature interval? Answer in units of"C". A) 0.3x103 c B) 5.0 x105c C) 6.0x10c D) 0.4x1010c

Answer 1