Q&A Hero

Physic

Q: In a steam engine, steam at 140C in a turbine does work on an external system, and the steam leaves the turbine at 100C. The efficiency of the steam engine is 5%. The relevant physical principle isa. the first law of thermodynamicsb. the second law of thermodynamicsc. specific heat capacityd. operation of a heat pumpe. none of the above
Q: Even when the temperature of a pan of water is below the boiling point, some water still evaporates. This is becausea. of convectionb. the kinetic energies of individual water molecules vary above and below the average valuec. the humidity always increasesd. none of the above
Q: 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 a. stays the same b. increases c. decreases d. cannot be determined
Q: At 96 F the saturation density of air is 0.04 kg/m3. If the weather report says the relative humidity is 90 % when the temperature is 96F, the humidity is a. 10 % b. 0.9 c. 0.004 kg/m3 d. 0.036 kg/m3 e. 0.04 kg/m3
Q: Why do bridges have expansion joints? a. They would buckle and crack otherwise. b. to let water run off c. to absorb vibrations due to traffic d. for ease in construction
Q: The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 ï‚´10-6/C. On a cold day when the temperature is "10C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40C is a. 300.0015 m b. 300.015 m c. 300.15 m d. 301.5 m e. 315 m
Q: After the 1 kg block of ice melts, the amount of heat required to raise its temperature to 10 C is a. 2,000 J b. 4,000 J c. 20,000 J d. 40,000 J e. 334,000 J
Q: As the ice is melting, the temperature of the ice-water mixture rises by a. 0C b. +5C c. "5C d. +10C e. "10C
Q: The 1 kg block of ice melts into water. The amount of heat absorbed by the ice as it melts is a. 2,000 J b. 4,000 J c. 20,000 J d. 40,000 J e. 334,000 J
Q: NARRBEGIN: Specific heat capacityspecific heat capacity of ice = 2,000 J/kg-Clatent heat of fusion of water = 334,000 J/kgspecific heat capacity of water = 4,000 J/kg-CNARRENDA 1 kg block of ice is removed from a freezer where its temperature was "10C. The amount of heat absorbed by the ice as it warms to 0C isa. 2,000 Jb. 4,000 Jc. 20,000 Jd. 40,000 Je. 334,000 J
Q: Which mechanism(s) of heat transfer will work in a vacuum?a. conduction b. convection c. radiationd. none of the above
Q: The temperature of a gas can be increased bya. compressing itb. adding heat to itc. doing work on itd. all of the abovee. none of the above
Q: 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. a. one tenth b. equal to c. 10 times d. unrelated to
Q: The specific heat capacity of water is about twice the specific heat capacity of ice. From this information, the amount of heat required to boil 1 kg of water is ________ the amount of heat required to melt 1 kg of ice.a. 1/2 b. equal to c. 2 timesd. unrelated to
Q: What's wrong with the statement "heat rises?"a. Nothingheat does rise.b. One should say "energy rises."c. One should say "heated air (or other fluid) rises."d. none of the above
Q: Natural processes tend to increase the __________ of thermodynamic systems.a. temperature b. internal energy c. Carnot efficiencyd. entropy
Q: When droplets of condensation form on the outside of a glass of ice water, it must be that in the air right next to the glassa. the temperature is near the dew pointb. the humidity is near the saturation densityc. the relative humidity is near 100%d. all of the above
Q: When water boils, its temperaturea. increases b. decreases c. stays constantd. cannot be determined
Q: When ice melts, its temperaturea. increases b. decreases c. stays constantd. cannot be determined
Q: The specific heat capacity of copper is three times the specific heat capacity of lead. Equal masses of copper and lead are heated from room temperature to the temperature of boiling water. To achieve this, the amount of heat added to the copper is ___________ the amount of heat added to the lead. a. 1/9 b. 1/3 c. equal to d. 3 times e. 9 times
Q: The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be ___________ the change in length of the Pyrex glass rod. a. 1/9 b. 1/3 c. equal to d. 3 times e. 9 times
Q: The change in size of an object due to thermal expansion depends upona. what the object is made ofb. the object's original sizec. how much the temperature changesd. A and Ce. all of the above
Q: The total kinetic and potential energies of all the atoms and molecules of a substance is itsa. heatb. internal energyc. temperatured. thermodynamicse. none of the above
Q: A hot pizza containsa. heatb. internal energyc. temperatured. worke. none of the above
Q: The amount of heat energy a refrigerator removes from the food stored inside it is ___________ the amount of electrical energy required to run the refrigerator.a. equal to b. greater than c. less thand. unrelated to
Q: An example of a heat mover is a(n)a. refrigeratorb. air conditionerc. heat pumpd. all of the abovee. none of the above
Q: A bimetallic strip is usable as a thermometer because ofa. heat conductionb. heat convectionc. heat radiationd. thermal expansione. none of the above
Q: "Firewalkers" step on the hot ashes and coals from a wood fire without getting their feet burned. How might this be possible?a. They have magical powers.b. The ashes are poor conductors of heat.c. They do get burned but enjoy the publicity.d. none of the above
Q: The lunar surface cools after the sun sets. This is an example ofa. heat conductionb. heat convectionc. heat radiationd. thermal expansione. none of the above
Q: A piece of chocolate melts in your mouth. This is an example ofa. heat conductionb. heat convectionc. heat radiationd. thermal expansione. none of the above
Q: A wood stove in the corner of a cabin causes the entire cabin to become heated. This is an example ofa. heat conductionb. heat convectionc. heat radiationd. thermal expansione. none of the above
Q: The warmth you feel from the sun at the beach is an example ofa. heat conductionb. heat convectionc. heat radiationd. thermal expansione. none of the above
Q: You hold one end of a solid rod in a fire, and the other end becomes hot. This is an example ofa. heat conductionb. heat convectionc. heat radiationd. thermal expansione. none of the above
Q: In a gas of different types of molecules all at the same temperature, the speeds of the heavier molecules will generally be _____________ the speeds of the lighter molecules.a. the same as b. greater than c. less thand. unrelated to
Q: Temperature measures a. how much heat is in a substance b. the internal energy of an object c. the average speed of atoms and molecules in a substance d. the average kinetic energy of atoms and molecules in a substance
Q: Which of these is stated properly? a. "The temperature of liquid nitrogen is 77 Kelvin." b. "The temperature of liquid nitrogen is 77 Kelvins." c. "The temperature of liquid nitrogen is 77 degrees Kelvin." d. "The temperature of liquid nitrogen is 77 Kelvin degrees."
Q: Which are biggerCelsius degrees or Fahrenheit degrees? a. Fahrenheit b. Celsius c. Neitherthey are the same size. d. This is a nonsensical comparison.
Q: The temperature scale where the numerical value is proportional to the average kinetic energy of the atoms or molecules isa. Fahrenheit b. Celsius c. Kelvind. none of the above
Q: A key is placed in a hot oven and warmed to 100C. As a resulta. the hole in the key becomes smallerb. the key is bent into an arcc. the key becomes longerd. all of the above
Q: A bimetallic strip is formed from two materials that have different a. coefficients of linear expansion b. heat capacities c. calories d. phase transitions e. relative humidities
Q: A device that makes use of a bimetallic strip is aa. thermometerb. thermostatc. choke control in an old automobiled. all of the abovee. none of the above
Q: One "food calorie" equalsa. 1 calorie b. 100 calories c. 1000 caloriesd. none of the above
Q: Which is larger, a calorie or a joule? a. calorie b. joule c. Neitherthey are the same. d. They cannot be compared since they measure different physical quantities.
Q: When a substance is exposed to something that has a lower temperature,a. work is done on itb. work is done by itc. heat is transferred from itd. heat is transferred to ite. none of the above
Q: Internal energy can only be changed by adding heat
Q: The dew point is the temperature at which a given humidity equals the saturation density.
Q: Evaporation is when a gas is converted into a liquid.
Q: Temperature is a measure of heat.
Q: A piston compresses a gas, while at the same time heat is lost to the surroundings. The temperature of the gas rises. This is governed by the second law of thermodynamics.
Q: In a steam engine, steam at 140C in a turbine does work on an external system, and the steam leaves the turbine at 100C. The efficiency of the steam engine is 5%. The relevant physical principle is the first law of thermodynamics.
Q: Air at a temperature of 32F has a relative humidity of 60%. If the temperature of the same air increases, the relative humidity increases.
Q: At 96F the saturation density of air is 0.04 kg/m3. If the weather report says the relative humidity is 90% when the temperature is 96F, the humidity is 0.036 kg/m3.
Q: The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 ï‚´10-6/C. On a cold day when the temperature is -10C the Eiffel tower is 300 meters tall. Its height on a hot day when the temperature is 40C is 300.15 m.
Q: After the 1 kg block of ice melts, the amount of heat required to raise its temperature to 10C is 3,340,000 J.
Q: As the ice is melting, the temperature of the ice-water mixture rises by 10C.
Q: The 1 kg block of ice melts into water. The amount of heat absorbed by the ice as it melts is 334,000 J.
Q: NARRBEGIN: Specific heat capacityspecific heat capacity of ice = 2,000 J/kg-Clatent heat of fusion of water = 334,000 J/kgspecific heat capacity of water = 4,000 J/kg-CNARRENDA 1 kg block of ice is removed from a freezer where its temperature was "10C. The amount of heat absorbed by the ice as it warms to 0C is 20,000 J.
Q: A liquid cannot be heated simultaneously by conduction, convection, and radiation.
Q: You can increase the temperature of a gas by compressing it.
Q: 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 10 times the amount of heat required to melt 1 kg of ice.
Q: The specific heat capacity of water is about twice the specific heat capacity of ice. The amount of heat required to boil 1 kg of water is twice the amount of heat required to melt 1 kg of ice.
Q: Water is good for putting out fires because it has a very high latent heat of vaporization.
Q: When water boils, its temperature increases.
Q: When you add heat to ice, its temperature always stays constant.
Q: When ice melts, its temperature increases.
Q: The specific heat capacity of copper is three times the specific heat capacity of lead. Equal masses of copper and lead are heated from room temperature to the temperature of boiling water. To achieve this, the amount of heat added to the copper is 3 times the amount of heat added to the lead.
Q: The coefficient of linear expansion of ordinary glass is three times that of Pyrex glass. An ordinary glass rod and a Pyrex glass rod of equal lengths at room temperature are dropped into boiling water. The change in length of the ordinary glass rod will be 3 times the change in length of the Pyrex glass rod.
Q: Natural processes tend to increase the entropy of thermodynamic systems.
Q: You can increase the internal energy of a gas by heating it or by compressing it.
Q: A steam turbine is an example of a heat mover.
Q: As the air cools at night the relative humidity usually drops.
Q: A refrigerator is an example of a heat mover.
Q: A bimetallic strip is usable in a thermometer because of its heat capacity.
Q: A wood stove in the corner of a cabin causes the entire cabin to become heated because of heat conduction.
Q: You feel warm from the sun at the beach because of heat radiation.
Q: When you hold one end of a solid rod in a fire, the other end becomes hot because of heat convection.
Q: On the Kelvin scale the temperature is proportional to the average kinetic energy of the atoms or molecules whose temperature is being measured.
Q: A hot pizza contains heat.
Q: Celsius degrees are larger than Fahrenheit degrees.
Q: A bimetallic strip is formed from two materials that have different heat capacities.
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