Physic

Q: You see a lightning flash and half a second later hear a loud blast of thunder. How far away did the lightning hit?a. about a mile b. half a mile c. a tenth of a miled. none of the above

Q: Doppler radar cana. catch speedersb. measure the speed of a pitcher's fastballc. detect tornadoesd. do all of the above

Q: You listen to a live orchestra concert from a cheap seat far away, high up in the balcony. The music seems to be a little out of sync with the conductor's beat. Why? a. The musicians are paying no attention to the conductor. b. You are noticing a time lag due to the finite speed of sound. c. The orchestra is not very good. d. The viola section is dragging.

Q: The wavelength of ultrasound at 1 million Hz in air where the speed of sound is 340 m/s is a. 0.00000034 m b. 0.0000034 m c. 0.00034 m d. 0.34 m e. 340,000,000 m

Q: Ultrasound is useda. to form images of internal organsb. by bats to navigatec. in automatic focus camerasd. to control insectse. all of the above

Q: In ultrasound the _____________ of the sound is much greater than in normal sound. a. frequency b. period c. wavelength d. amplitude e. speed

Q: Which of the following is not one of the ways sound can be used? a. to circulate the refrigerant in a refrigerator b. to relay information to orbiting satellites c. to form images of internal organs d. to measure the air temperature aloft e. to make a bubble in water produce light

Q: Choose the correct statement. a. The perceived pitch of a sound usually doesn"t depend on the sound's frequency. b. The frequency of each musical note is 10 Hz higher than that of the next lower note. c. The decibel is the standard measure of tone quality. d. The perceived loudness of a sound depends somewhat on frequency.

Q: As you move farther away from a source emitting a pure tone, the ___________ of the sound you hear decreases.a. frequencyb. periodc. wavelengthd. amplitudee. none of the above

Q: Two speakers in a stereo emit identical pure tones. As you move around in front of the speakers, you hear the sound alternating between loud and zero. This occurs because of a. interference b. changing sound level c. diffraction d. the Doppler effect e. shock waves

Q: When two identical waves arrive at the same place in phase, there is a. constructive interference b. destructive interference c. diffraction d. a Doppler effect e. a shock wave

Q: Which of these waves will diffract the most when passing through a 20 cm wide opening in a barrier?a. a wave with a wavelength of 25 cmb. a wave with a wavelength of 2 cmc. a wave with a wavelength of 0.05 cmd. none of these waves will diffract at all

Q: You can hear sound through an open window from sources that are not in your line of sight because ofa. interferenceb. diffractionc. the sound leveld. the Doppler effecte. none of the above

Q: If the source moves, the wavelength of the sound in front of the direction of motion is ____________ the wavelength behind the direction of motion.a. the same as b. larger than c. smaller thand. unrelated to

Q: If the source moves away from you faster than the speed of sound in air, the frequency that you hear isa. the same as f b. higher than f c. lower than fd. unrelated to f

Q: If the temperature of the air rises, the frequency you hear isa. the same as f b. higher than f c. lower than fd. unrelated to f

Q: If the source moves away from you, and at the same time you run away from the source, the frequency you hear isa. the same as f b. higher than f c. lower than fd. unrelated to f

Q: If you run towards the source, the frequency you hear isa. the same as f b. higher than f c. lower than fd. unrelated to f

Q: What is the maximum efficiency of a heat engine operating between 293 Kelvins and 273 Kelvins, the temperatures at the surface and several hundred meters below the surface, respectively, of the ocean?

Q: On a winter day the temperature is 5 degrees Celsius and the humidity is 0.003 kilograms per cubic meter.(a) What is the relative humidity?(b) The air is brought into a building and heated to 20 degrees Celsius without changing the humidity. What is the relative humidity inside the building?

Q: A baseball with mass 0.14 kilograms and speed 40 m/s is caught. If all of its kinetic energy is converted to internal energy as it is caught, what is its temperature change? (Assume the baseball's specific heat capacity is 1,000 joules per kilogram degree Celsius.)

Q: A 4 kilogram block of ice is removed from a freezer where its temperature was maintained at "20 degrees Celsius. How much heat does the ice absorb as it is warmed to "10 degrees? (The specific heat capacity of ice is 2,000 joules per kilogram degree Celsius.)

Q: The air inside a bicycle tire pump has 60 joules of work done on it as 20 joules of heat is conducted away from it. What is the change in internal energy of the air?

Q: The Eiffel tower in Paris is 300 meters tall on a cold day (T = " 5 degrees Celsius). What is its height on a hot day when the temperature is 35 degrees? (It is made of iron which has a coefficient of linear expansion of 0.000012 per degree Celsius.)

Q: Match each item with the correct statement below.a. bimetallic strip i. heat moverb. Carnot efficiency j. humidityc. conduction k. internal energyd. convection l. radiatione. entropy m. saturation densityf. evaporation n. temperatureg. heat o. dew pointh. heat engine1/ used in thermostats and some thermometers2/ can be increased by doing work on a substance or by adding heat to it3/ main mechanism of heat transfer in a solid4/ the density of water vapor in the air5/ this is how we receive heat from the sun6/ refrigerators, air conditioners and heat pumps are examples7/ the maximum possible humidity8/ the best that a heat engine can have9/ heat transfer by way of buoyant mixing in a fluid10/depends on the average kinetic energy of atoms and molecules in a substance11/ At temperatures below their boiling point, liquids gradually go into the gas phase through a process called

Q: At temperatures below their boiling point, liquids gradually go into the gas phase through a process called

Q: An object transfers heat when its temperature is lowered by contact with

Q: An object transfers heat when its temperature is raised by contact with a

Q: A material through which heat conducts slowly is called a __________.

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 __________ law of thermodynamics.

Q: The air temperature where the humidity reaches the saturation density is called the ___________.

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 __________ law of thermodynamics.

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 __________.

Q: The Eiffel tower in Paris is made primarily of iron, whose coefficient of linear expansion is about 10 x 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 __________.

Q: After the 1 kg block of ice melts, the amount of heat required to raise its temperature to 10C is __________.

Q: As the ice is melting, the temperature of the ice-water mixture rises by __________.

Q: The 1 kg block of ice melts into water. The amount of heat absorbed by the ice as it melts is __________.

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 __________.

Q: Natural processes tend to increase the __________ of thermodynamic systems.

Q: Two ways that the temperature of a gas can be increased are by __________ and __________.

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 1 kg of water is __________ 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 raise the temperature of 1 kg of water 10C is __________ times the amount of heat required to raise the temperature of 1 kg of ice 10C.

Q: When water boils, its temperature __________.

Q: When ice melts, its temperature __________.

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 __________ 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 __________ times the change in length of the Pyrex glass rod.

Q: __________ is transferred from a substance if it is exposed to something that has a lower temperature.

Q: Two ways that the internal energy of a substance can be increased are __________ and __________.

Q: Three examples of a heat mover are __________, __________, and __________.

Q: A bimetallic strip is usable as a thermometer because of the property of __________.

Q: Heating the air in a hot air balloon reduces the air's _________.

Q: A hot pizza contains __________.

Q: As the air cools at night the relative humidity usually __________.

Q: A wood stove in the corner of a cabin causes the entire cabin to become heated. This is an example of __________.

Q: The warmth you feel from the sun at the beach is an example of __________.

Q: You hold one end of a solid rod in a fire, and the other end becomes hot. This is an example of __________.

Q: The temperature scale where the numerical value is proportional to the average kinetic energy of the atoms or molecules is __________.

Q: The lowest temperature is called ______________.

Q: A bimetallic strip is formed from two materials that have different __________.

Q: Two devices that make use of a bimetallic strip are a __________ and a __________.

Q: The first law of thermodynamics is basically a special version of the law of ______________.

Q: The average kinetic energy of the atoms in a spoon determines its __________.

Q: Internal energy in a system can be changes bya. doing work on the system b. increasing the specific heat in the system c. changing the temperature of the systemd. transferring heat to/from the system

Q: The internal energy of a substance can be increased bya. doing work on itb. letting it do workc. adding heat to itd. extracting heat from ite. none of the above

Q: The internal energy of air can be increased bya. compressing it b. allowing heat to flow into it c. lifting itd. allowing it to expand

Q: Solar energy a. is a recent invention b. has been used for a long time c. has not yet been successfully developed d. is indirectly the source of most of the energy we use

Q: Stepping barefoot off a rug onto a hardwood floor makes your feet feel cold. Why?a. The hardwood floor is at a lower temperature than the rug.b. The hardwood floor is at a lower temperature than your feet.c. The hardwood floor conducts heat away from your feet better than the rug.d. all of the above

Q: Absolute zero isa. 0 K b. - 459.67F c. - 273.15Cd. 0 on any temperature scale.

Q: In the First Law of Thermodynamics, the work can bea. only positive b. only negative c. neitherd. either positive or negative

Q: The specific heat capacity of a substance is the amount of energy required to raise 1 kg of the substance by a temperature ofa. 1F b. 10 C c. 10 Fd. 1C

Q: A car weighs 1,725 kg and is speeding on I-75 at 90 miles per hour. The brake rotors are made of 20 kg of iron and steel composite. The car comes to the crest of a hill and traffic is stopped ahead. The driver slams on the brakes and stops the car just in time. What is the temperature change in the rotors?a. 180 oC b. 151.7 oC c. 251.7 oFd. 300 K

Q: As long as there is ice in your drink, the temperature of the ice remains neara. room temperature b. the temperature of the drink c. zero Celsiusd. zero Fahrenheit

Q: Heat flows froma. cold to hot b. hot to cold c. Kelvin to Celsiusd. the same as temperature

Q: Heat transfer by radiation occurs viaa. electromagnetic wavesb. nuclear decayc. molecular collisionsd. the solar winde. none of the above

Q: A piston compresses a gas, while at the same time heat is lost to the surroundings. The temperature of the gas rises. The amount of temperature rise is governed bya. the first law of thermodynamicsb. the second law of thermodynamicsc. specific heat capacityd. a heat pumpe. none of the above

Q: The efficiency of a heat enginea. can never exceed the Carnot efficiencyb. can be improved by lowering the temperature of the cool reservoirc. can be improved by raising the temperature of the hot reservoird. all of the above

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