PHYS 101-B08 Quiz 5 {SOLVED } Questions and Answers | Already Graded A

PHYS 101-B08 Quiz 5 Question 1 2 out of 2 points A bimetallic strip is formed from two materials that have different Selected Answer: c. coefficients of linear expansion. Question 2 2 out of 2 points You hold one end of a solid rod in a fire, and the other end becomes hot. This is an example of Selected Answer: a. heat conduction. Question 3 2 out of 2 points A bimetallic strip is usable as a thermometer because of Selected Answer: d. thermal expansion. Question 4 2 out of 2 points One “food calorie” equals Selected Answer: c. 1000 calories. Question 5 2 out of 2 points When a substance is exposed to something that has a lower temperature, Selected Answer: c. heat is transferred from it. Question 6 2 out of 2 points A piece of chocolate melts in your mouth. This is an example of Selected Answer: a. heat conduction. Question 7 2 out of 2 points The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 × 10−6/°C. On a cold day when the temperature is –10°C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40°C is Selected Answer: b. 300.15 m. Question 8 2 out of 2 points Temperature measures Selected Answer: b. the average kinetic energy of atoms and molecules in a substance. Question 9 0 out of 2 points The efficiency of a heat engine Selected Answer: a. can never exceed the Carnot efficiency. Question 10 2 out of 2 points Air at a temperature of 32° F has a relative humidity of 60%. If the temperature of the same air rises to 40° F, the relative humidity Selected Answer: d. decreases. Question 11 2 out of 2 points Heat flows from Selected Answer: d. hot to cold. Question 12 2 out of 2 points Why do bridges have expansion joints? Selected Answer: c. They would buckle and crack otherwise. Question 13 2 out of 2 points The latent heat of vaporization of water is roughly 10 times the latent heat of fusion of water. The amount of heat required to boil away 1 kg of water is the amount of heat required to melt 1 kg of ice. Selected Answer: d. 10 times Question 14 2 out of 2 points The specific heat capacity of a substance is the amount of energy required to raise 1 kg of the substance by a temperature of Selected Answer: c. 1°C. Question 15 2 out of 2 points Even when the temperature of a pan of water is below the boiling point, some water still evaporates. This is because Selected Answer: b. the kinetic energies of individual water molecules vary above and below the average value. Question 16 2 out of 2 points Air at a temperature of 32°F has a relative humidity of 60%. If the temperature of the same air increases, the relative humidity increases. Selected Answer: False Question 17 2 out of 2 points Heat is transferred from a substance if it is exposed to something that has a lower temperature. Selected Answer: True Question 18 2 out of 2 points Water is good for putting out fires because it has a very high latent heat of vaporization. Selected Answer: True Question 19 2 out of 2 points A steam turbine is an example of a heat mover. Selected Answer: False Question 20 2 out of 2 points You feel warm from the Sun at the beach because of heat radiation. Selected Answer: True Question 21 2 out of 2 points One “food calorie” equals 1000 calories. Selected Answer: True Question 22 2 out of 2 points A refrigerator is an example of a heat mover. Selected Answer: True Question 23 2 out of 2 points specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C As the ice is melting, the temperature of the ice-water mixture rises by 10°C. Selected Answer: False Question 24 2 out of 2 points A bimetallic strip is usable in a thermometer because of its heat capacity. Selected Answer: False Question 25 0 out of 2 points A bimetallic strip is formed from two materials that have different heat capacities. Selected Answer: True Question 26 Needs Grading The boiling point of water is 100oC or 212oF. The freezing point of water is 0oC or 32oF. Follow the steps below to write an equation F = mC +b, for the conversion of the temperature from oC to oF. Write the boiling point and freezing point of water in ordered pairs (oC, oF). Find b by setting C = 0, F =32. Find m by setting C=100, F=212, and using the result from part (b) Express F = mC+b, using results from parts (b) and (c) Convert the following temperature from oC to oF: C = 5, F = ? C = 10, F = ? C = -40, F = ? Make sure to label your answers. Selected Answer: