376531
Questão 1
Questão
What direction does heat flow spontaneously (happening apparently)?
Responda
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cold → hot
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hot → cold
Questão 2
Questão
What is temperature compared to thermal energy (difference)?
Responda
-
Temperature: overall or random amount of energy/heat (°F, °C, °K) , Thermal Energy: directly measured (Joules)
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Temperature: directly measured (°F, °C, °K) , Thermal Energy: overall or random amount of energy/heat (Joules)
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Temperature: directly measured (Joules) , Thermal Energy: overall or random amount of energy/heat (°F, °C, °K)
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Temperature: overall or random amount of energy/heat (Joules) , Thermal Energy: directly measured (°F, °C, °K)
Questão 3
Questão
Is work 100% efficient?
Responda
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Yes; it is ALWAYS lost
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Yes; it is NEVER lost
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No; friction gets ALL of the energy lost
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No; friction gets SOME of the energy lost
Questão 4
Questão
What is conduction?
Responda
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Energy transferred by 2 things TOUCHING
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Energy transferred through the movement of liquid or through CURRENTS
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Energy transferred from an energy source and DOESN'T have to travel through MATTER
Questão 5
Questão
What is radiation?
Responda
-
Energy transferred by 2 things TOUCHING
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Energy transferred through the movement of liquid or through CURRENTS
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Energy transferred from an energy source and DOESN'T have to travel through MATTER
Questão 6
Questão
What is convection?
Responda
-
Energy transferred from an energy source and DOESN'T have to travel through MATTER
-
Energy transferred through the movement of liquid or through CURRENTS
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Energy transferred by 2 things TOUCHING
Questão 7
Questão
What is thermodynamics?
Responda
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The study of heat and thermal energy
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The study of conversions between heat and other forms of energy
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The study of particle movement
Questão 8
Questão
What is the 1st law of thermodynamics?
Responda
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We can never reach absolute zero
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Energy con never be created or destroyed and therefore must be conserved
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Energy flows from hot → cold (to go from cold → hot, you must do work)
Questão 9
Questão
What is the 2nd law of thermodynamics?
Responda
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Energy flows from hot → cold (to go from cold → hot, you must do work)
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Energy con never be created or destroyed and therefore must be conserved
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We can never reach absolute zero
Questão 10
Questão
What is the 3rd law of thermodynamics?
Responda
-
Energy flows from hot → cold (to go from cold → hot, you must do work)
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We can never reach absolute zero
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Energy con never be created or destroyed and therefore must be conserved
Questão 11
Questão
What does thermal energy depend on? (more than one answer)
Responda
-
temperature
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volume
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density
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phase
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mass
Questão 12
Questão
Most substances _____ when they freeze and _____ when heated. However, water _____ when it freezes _____ when it is heated.
Responda
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contrast; expand; expand; contrast
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contrast; expand; contrast; expand
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contrast; contrast; expand; expand
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expand; expand; contrast; contrast
Questão 13
Questão
What is specific heat?
Responda
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When 2 different objects reaching the same temperature
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Amount of heat needed to raise 1 gm of material 1°C
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Amount of energy an object can sustain
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Change in temperature
Questão 14
Questão
What is water's specific heat?
Responda
-
3.98 J/g°C ≈ 4 J/g°C
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4 J/g°C (exactly)
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2.98 J/g°C ≈ 3 J/g°C
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1.98 J/g°C ≈ 2 J/g°C
Questão 15
Questão
Is water's specific heat high or low compared to other materials?
Responda
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high; temperature raises less when energy is added
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low; temperature raises less when energy is added
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high; temperature raises more when energy is added
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low; temperature raises more when energy is added
Questão 16
Questão
What is thermal equilibrium?
Responda
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When 2 different objects reaching the same temperature
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Amount of heat needed to raise 1 gm of material 1°C
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Change in temperature
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Amount of energy an object can sustain
Questão 17
Questão
What do engines or motors do?
Responda
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They are machines designed to make electricity by making a turbine turn
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They are machines designed to make electricity by burning fuel
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They are machines designed to convert mechanical energy into other forms of energy
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They are machines designed to convert energy into mechanical energy
Questão 18
Questão
What is internal combustion?
Responda
-
Fuel sprayed into a cylinder which is then ignited and drives the piston (happening all together and inside motor)
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Fuel that is ignited outside of the motor along with combustion
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Burning happening inside a engine
Questão 19
Questão
What is external combustion?
Responda
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Fuel that is ignited outside of the motor along with combustion
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Burning happening outside an engine
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Fuel sprayed into a cylinder which is then ignited and drives the piston (happening all together and inside motor)
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