Question and answer
During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber, A. both the intake and exhaust valves are open. B. both
the intake and exhaust valves are closed. C. the intake valve is open and the exhaust valve is closed. D. the exhaust valve is open and the intake valve is closed.
B. both the intake and exhaust valves are closed. During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber both the intake and exhaust valves are closed.
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Original conversation
User: During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber, A. both the intake and exhaust valves are open. B. both the intake and exhaust valves are closed. C. the intake valve is open and the exhaust valve is closed. D. the exhaust valve is open and the intake valve is closed.

Weegy: B. both the intake and exhaust valves are closed. During the stage of internal combustion engine operation in which the piston rises and compresses the fuel in the combustion chamber both the intake and exhaust valves are closed.
eturker|Points 2985|

User: Heat from burning fuel warms the walls of the firebox section of the furnace in A. a hot-water heating system. B. a compressor compartment. C. an evaporation system. D. a hot-air heating system.

Weegy: D. a hot-air heating system.
uxiali|Points 1590|

User: What is the length of an aluminum rod at 65°C if its length at 15°C is 1.2 meters? A. 0.001386 meter B. 1.214855 meters C. 0.00180 meter D. 1.201386 meters

Weegy: B. 1.201386 meters. at 65 C
robDess|Points 70|

User: How much heat energy is required to raise the temperature of 5 kilograms of coal from 20°C to 220°C? A. 314 J B. 6,573 J C. 4,187,000 J D. 1,314,718 J

Weegy: B. 1,314,718 J of energy is required to raise the temperature of 5 kilograms of coal from 20 C to 220 C
wah156|Points 60|

User: A quantity of a gas has an absolute pressure of 400 kPa and an absolute temperature of 110 degrees kelvin. When the temperature of the gas is raised to 235 degrees kelvin, what is the new pressure of the gas? (Assume that there's no change in volume.) A. 510 kPa B. 1.702 kPa C. 854.46 kPa D. 3.636 kPa

Weegy: the answer is B. 854.46 kPa 854.46 kPa is the new pressure of the gas.
Shey091808|Points 863|

User: A quantity of gas has a volume of 0.20 cubic meter and an absolute temperature of 333 degrees kelvin. When the temperature of the gas is raised to 533 degrees kelvin, what is the new volume of the gas? (Assume that there's no change in pressure.) A. 0.3198 m3 B. 0.2333 m3 C. 0.2146 m3 D. 0.0006 m3

Weegy: D. 0.2146 m3
rheyniel_hzt|Points 0|

User: A quantity of gas has a volume of 0.20 cubic meter and an absolute temperature of 333 degrees kelvin. When the temperature of the gas is raised to 533 degrees kelvin, what is the new volume of the gas? (Assume that there's no change in pressure.) A. 0.3198 m3 B. 0.2333 m3 C. 0.2146 m3 D. 0.0006 m3

Weegy: D. 0.2146 m3
rheyniel_hzt|Points 0|

User: If the absolute temperature of a gas is 600 K, the temperature in degrees Celsius is A. 873°C. B. 327°C. C. 273°C. D. 705°C.

Weegy: B. 327 C
Fanboy|Points 2821|

User: How much heat is required to convert 0.3 kilogram of ice at 0°C to water at the same temperature? A. 100,375 J B. 450,759 J C. 334,584 J D. 167,292 J

Weegy: 100,375 J is required to convert 0.3 kilograms of ice at 0 C to water at the same temperature.
AngelInDisguise|Points 5101|

User: What is the temperature 32 degrees Fahrenheit in degrees Celsius? A. 0 degrees Celsius B. –10 degrees Celsius C. 10 degrees Celsius D. 20 degrees Celsius

Weegy: 32 degrees Fahrenheit is exactly 0 (zero) degrees Celsius, the freezing point of water. It is one of the benchmarks in the temperature scales. Temperature in .... F ...... C Same in both ..... -40 .... -40 Water freezes ..... 32 ........ [ 0 Human body ....... 98.6 ... 37 Water boils ........212 .... 100 The temperature is 0 degrees Celsius. You can find this by using the formula C = (5/9)(F-32) ]
akoine|Points 2078|

User: The transmission of heat requiring the movement of a liquid or a gas is A. convection. B. radiation. C. transduction. D. conduction.

Weegy: The transmission of heat requiring the movement of a liquid or a gas? Answer: Radiation
ACTS|Points 111|

User: A silver bar 0.125 meter long is subjected to a temperature change from 200°C to 100°C. What will be the length of the bar after the temperature change? A. 0.0000189 meter B. 0.124764 meter C. 0.00023635 meter D. 0.00002363 meter

Weegy: The length of the bar after the temperature change will be: B. 0.124764 meter.
andrewpallarca|Points 24085|

User: Which of the following takes place in the combustion chamber of a gas turbine engine? A. A mixture of fuel oil and compressed air is ignited. B. Gases are cooled to a desired temperature. C. Fuel oil is stored with sufficient pressure. D. Fuel oil is mixed with a proper portion of compressed air.

Weegy: B. A mixture of fuel oil and compressed air is ignited.
selymi|Points 10989|

User: The waste products of combustion leave the internal combustion engine through the A. cylinder. B. intake valve. C. crankshaft. D. exhaust valve.

Weegy: D. exhaust valve
jolito098|Points 353|

User: Which of the following statements correctly describes the position of the intake and exhaust valves during most of the power stage in a four-cycle gas engine? A. Both the intake valve and the exhaust valve are open. B. The intake valve is open and the exhaust valve is closed. C. Both the intake valve and the exhaust valve are closed. D. The intake valve is closed and the exhaust valve is open.

Weegy: Both the intake valve and the exhaust valve are closed.
AngelInDisguise|Points 5101|

User: Which one of the following temperatures is equal to 5°C? A. 465 K B. 41 K C. 0 K D. 278 K

Weegy: A. 278 is equal to 5 C temperatures.
sujaysen|Points 4786|

User: The main difference between the internal combustion engine and the diesel engine is that the diesel engine A. has no ignition system. B. does not utilize pistons. C. does not have a crankshaft. D. has no connecting rods.

Weegy: A. has no ignition system
mythmoh|Points 5349|

User: When the molecules in a body move with increased speed, it's possible that the body will change from a A. liquid to a solid. B. liquid to a gas. C. gas to a solid. D. gas to a liquid.

User: Unlike other kinds of liquids, volatile liquids A. ignite readily at a relatively low temperature. B. evaporate rapidly at a relatively low temperature. C. flow rapidly at a relatively low temperature. D. freeze readily at a relatively high temperature.

Weegy: Unlike other kinds of liquids, volatile liquids: D. evaporate rapidly at a relatively low temperature.
andrewpallarca|Points 24085|

User: A temperature of 273 K is the temperature at which water A. boils. B. freezes. C. evaporates. D. lacks any moving molecules.

Weegy: A. freezes
Roy0624|Points 609|

User: The amount of heat energy required to raise the temperature of a unit mass of a material one degree is A. absolute zero. B. its heat capacity. C. a Btu. D. a Joule.

Weegy: Heat Capacity is the amount of heat required to raise the temperature of a specified amount of a substance by 1 c or 1 k. So the answer is A. its Heat Capacity
aileen26|Points 169|

User: 20 cubic inches of a gas with an absolute pressure of 5 psi is compressed until its pressure reaches 10 psi. What is the new volume of the gas? (Assume that there's no change in temperature.) A. 100 cubic inches B. 40 cubic inches C. 10 cubic inches D. 5 cubic inches

Weegy: D. 10 cubic inches
concreterose|Points 560|

User: In a gasoline engine, the area in the cylinder head where the air-and-fuel mixture is burned is called the A. cylinder. B. intake valve. C. piston. D. combustion chamber.

Weegy: A. combustion chamber
christilynch|Points 90|

User: A temperature of 200°F is equivalent to approximately A. 37.8°C. B. 232°C. C. 93.3°C. D. 840°C.

Weegy: 200 degrees f is equal to 93.3 celcius.
xgabriellex|Points 615|

User: The _______ is used to express absolute temperatures in the English system of measurement. A. Kelvin scale B. Celsius scale C. Rankine scale D. Fahrenheit scale

Weegy: The Fahrenheit scale is used to express absolute temperatures in the English system of measurement.
alfred123|Points 2428|

User: The main purpose of the turbine in the turbojet engine is to A. increase the velocity of the exhaust gases. B. compress the air. C. drive the compressor. D. reduce the temperature of the exhaust gas.

Weegy: A. Drive the compressor
Pinkygrl1183|Points 750|

User: A sound that's produced by a single wave at a constant frequency and with no overtones is called A. a mellow sound. B. a discordant sound. C. an average sound. D. a pure sound.

Weegy: The answer is C. a pure sound.
smileytrip|Points 86|

User: In a stringed musical instrument, the part that vibrates in resonance with the sound waves produced by the strings is called the A. reed. B. diatonic scale. C. membrane. D. sounding board.

Weegy: In a stringed musical instrument, the part that vibrates in resonance with the sound waves produced by the strings is called the C. sounding board.
cha97mw|Points 1146|

User: If you were trying to build a soundproof room, which of the following materials would you choose in order to absorb the most sound? A. Carpet B. Wood C. Heavy curtains D. Concrete

Weegy: If you were trying to build a soundproof room you need Carpet in order to absorb the most sound.
chinggay_0118|Points 831|

User: Rarefaction occurs only in a _______ wave. A. forced. B. transverse. C. longitudinal. D. sympathetic.

User: A surface receiving sound is moved from its original position to a position three times farther away from the source of the sound. The intensity of the received sound thus becomes A. nine times as high. B. nine times as low. C. three times as high. D. three times as low.

User: If a wave hits a smooth surface at an angle of incidence of 40 degrees, the angle of reflection is A. 80 degrees. B. 0 degrees. C. 90 degrees. D. 40 degrees.

User: The part of the ear where sound wave compressions and rarefactions cause the eardrum to vibrate is the A. inner ear. B. outer ear. C. middle ear. D. auditory nerve.

Weegy: The part of the ear where sound wave compressions and rarefactions cause the eardrum to vibrate is the C. middle ear.
debnjerry|Points 49173|

User: The spreading of sound waves around openings in barriers is called A. refraction. B. an echo. C. diffraction. D. reverberation.

Weegy: B. diffraction
shifa saleheen|Points 9966|

User: In a stringed musical instrument, the sound frequency of a particular string can be increased by A. increasing the string's thickness. B. loosening the string. C. tightening the string. D. lengthening the string.

Weegy: A. tightening the string.
shifa saleheen|Points 9966|

User: Which one of the following environments will sound not travel through? A. Gas B. Vacuum C. Solid D. Liquid

User: When a tuning fork vibrates over an open pipe and the air in the pipe starts to vibrate, the vibrations in the tube are caused by A. resonance. B. beats. C. reinforcement. D. harmonics.

Weegy: The answer is C. resonance.
bonaxle|Points 789|

User: If a string vibrates at the fundamental frequency of 528 Hz and also produces an overtone with a frequency of 1,056 Hz, this overtone is the A. third harmonic. B. fourth harmonic. C. second harmonic. D. first harmonic.

User: When a sound from a source is refracted away from the surface of the earth, it gives an indication that the A. ground is cooling faster than the air. B. air has high humidity. C. air is cooler than the ground. D. wind is blowing in the direction of the sound.

Weegy: B. wind is blowing in the direction of the sound
bananayumboat|Points 563|

User: A wave with a period of 0.008 second has a frequency of A. 125 Hz. B. 12.5 Hz. C. 800 Hz. D. 80 Hz.

Weegy: A. 125 Hz. A disturbance that propagates through space is called a wave. [ Periodic waves are characterised by crests(highs) and troughs(lows). The Time Period of a wave is the time taken for a wave to complete one cycle and come back to the position from where it started(0 or 2pi radians). The Frequency is how many cycles the wave completes in unit time(one second) called Hertz(Hz). Now if one cycle takes = 0.008 sec in one sec no of cycles = (1 sec / 0.008 sec) = 125 cycles/sec = 125 Hz ]
latefisher|Points 3420|

User: An overtone that's a whole number multiple of the fundamental frequency of a string is called a A. harmonic. B. pitch. C. discordant sound. D. scale.

Weegy: A. harmonic. An overtone that's a whole number multiple of the fundamental frequency of a string is called harmonic.
migzptz|Points 7617|

User: If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have A. a pitch lower than the original pitch. B. an amplitude lower than the original amplitude. C. a period higher than the original period. D. a frequency higher than the original frequency.

Weegy: If a source of sound waves is rapidly approaching a person, the sound heard by the person appears to have D. a frequency higher than the original frequency.
may100|Points 2638|

User: The distance from one molecule in a body to the nearest molecule in the body occupying a similar position and moving in the same direction is a A. compression. B. rarefaction. C. refraction. D. wavelength.

Weegy: The distance from one molecule in a body to the nearest molecule in the body occupying a similar position and moving in the same direction is a Wavelength.
GavinLorin|Points 0|

User: In a transverse wave that travels through a medium, the molecules of the medium vibrate A. with smaller amplitudes than the molecules in a longitudinal wave. B. at twice the velocity of the molecules in a longitudinal wave. C. in the direction in which the wave travels. D. at right angles to the direction in which the wave travels.

Weegy: B. at right angles to the direction in which the wave travels. Longitudinal waves vibrate the medium in the same direction as the propogation of the wave.
lolai3|Points 50|

User: The function of the eardrum in the middle ear is to A. collect the sound waves. B. amplify the received sound. C. vibrate with the frequency of the received sound. D. carry the sound energy to the brain.

Weegy: D. vibrate with the frequency of the received sound
shifa saleheen|Points 9966|

User: Which of the following phenomena is taking place when sound waves are reflected from a surface along parallel lines? A. Focusing B. Absorption C. Refracting D. Diffusion

Weegy: D. Refracting is taking place when sound waves are reflected from a surface along parallel lines.
andrewpallarca|Points 24095|

User: The maximum distance a molecule has been moved from its normal position by a wave is A. frequency. B. rarefaction. C. amplitude. D. compression.

Weegy: A. amplitude.
ailahlin|Points 120|

User: The _______ of a sound wave is defined as the amount of energy passing through a unit area of the wave front in a unit of time. A. compression B. intensity C. amplitude D. frequency

User: The change in pitch of a train's horn as it passes while you are standing still can be explained by A. resonance. B. sympathetic vibration. C. the Doppler effect. D. ultrasonic vibrations.

Weegy: C. the Doppler effect.
Mayang30|Points 815|

User: Which one of the following frequencies of a wave in the air can be heard as an audible sound by the human ear? A. 1,000 Hz B. 0.10 Hz C. 100,000 Hz D. 10 Hz

Weegy: B. 1,000 Hz can be heard as an audible sound by the human ear.
andrewpallarca|Points 24095|

User: The number of waves that pass a particular point in a body in a unit of time is called the _______ of the waves. A. rarefaction B. compression C. amplitude D. frequency

Weegy: B. frequency is correct
shifa saleheen|Points 9966|

User: Which of the following will result in a chemical change? A. Evaporating alcohol into vapor B. Burning coal in a furnace C. Melting ice to obtain water D. Drying wood in a shed

Weegy: C. Burning coal in a furnace
MrG|Points 4453|

User: A solution that contains a small amount of salt and a large amount of water is said to be a _______ solution. A. unsaturated B. dilute C. concentrated D. saturated

Weegy: A solution that contains large amount of salt and small amount of water is B. dilute
MrG|Points 4453|

User: Salt is the product formed by a reaction in which _______ atoms of an acid are replaced by the atoms of a metal. A. hydrogen B. nitrogen C. carbon D. oxygen

Weegy: C. hydrogen. Salt is the product formed by a reaction in which hydrogen atoms of an acid are replaced by the atoms of a metal.
eturker|Points 2985|

User: One atom of silicon can properly be combined in a compound with A. two atoms of oxygen. B. four atoms of calcium. C. one atom of chlorine. D. three atoms of hydrogen.

Weegy: The answer is A. two atoms of oxygen.
rhey22787|Points 1476|

User: Which of the following is represented in the highest percentage by volume in dry air? A. Hydrogen B. Nitrogen C. Oxygen D. Carbon dioxide

Weegy: In dry air, the element with the highest percentage by volume is C.- Nitrogen.
hhaokok|Points 42|

User: The periodic table is based on an element's A. molecular size. B. atomic mass. C. molecular mass. D. atomic number.

Weegy: C. atomic mass
beboythewizkid|Points 2048|

User: A chemical reaction in which compounds break up into simpler constituents is a _______ reaction. A. decomposition B. combination C. double replacement D. substitution

Weegy: B. decomposition
ash 24|Points 250|

User: If water and oil are combined in a container, the resulting liquid is a(n) A. solution. B. suspension. C. emulsion. D. mixture.

User: A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a _______ reaction. A. decomposition B. double replacement C. combination D. substitution

Weegy: A chemical reaction in which two elements or radicals change places with two other elements or radicals is a B. double replacement.
liner21|Points 141|

User: The periodic table was developed based upon the work of which scientist? A. Newton B. Moseley C. Dalton D. Mendeleev

Weegy: The answer is A. Mendeleev
smileytrip|Points 86|

User: Which one of the following chemical equations is balanced? A. 2NaCl + H2SO4 HCL + NaSO4 B. 2Na + S 2NaS C. KOH + H2SO4 KHSO4 + H2O D. NH3 + H2O 2NH4OH

Weegy: B. KOH + H2SO4 ? KHSO4 + H2O is the answer.
OxTornado007|Points 6899|

User: Which of the following elements is stable? A. Boron, atomic number 5 B. Fluorine, atomic number 9 C. Neon, atomic number 10 D. Carbon, atomic number 6

Weegy: C. Neon, atomic number 10
askmealways|Points 223|

User: Which one of the following is a characteristic of a metal? A. Reacts with bases to produce salts B. Becomes negative when combined with other elements C. Conducts heat readily D. Changes the color of litmus paper to red

User: The factor that affects how easily an electron can be removed from an atom is the A. size of the atom. B. structure of the atom. C. temperature of the environment. D. surrounding atoms.

Weegy: That factor that affects the electron is structure of the atom. [ ]
Expert answered|nami008|Points 222|

User: A substance that contains hydrogen that may be replaced by a metal is a/an A. nonmetal. B. base. C. acid. D. colloid.

Weegy: C. acid. source:[ ]
Expert answered|nami008|Points 222|

User: The element fluorine is classified in the periodic table as a/an A. metal. B. halogen. C. metalloid. D. alkali metal.

Weegy: A. halogen. Fluorine is classified as a halogen. Source: [ ]
Expert answered|nami008|Points 222|

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