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Questions and Answers
What is the amount of heat needed to change the phase of 1 kg of a substance from solid to liquid without a change in temperature called?
What is the amount of heat needed to change the phase of 1 kg of a substance from solid to liquid without a change in temperature called?
Which of the following mechanisms does NOT transfer heat?
Which of the following mechanisms does NOT transfer heat?
Sea breeze is primarily an example of which type of heat transfer?
Sea breeze is primarily an example of which type of heat transfer?
The unit of heat capacity is measured in which of the following?
The unit of heat capacity is measured in which of the following?
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If heat is removed from a system, the sign of Q is typically considered to be:
If heat is removed from a system, the sign of Q is typically considered to be:
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What is the corresponding temperature in Celsius for 86 °F?
What is the corresponding temperature in Celsius for 86 °F?
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The heat capacity of a substance depends on which factors?
The heat capacity of a substance depends on which factors?
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What is the mechanical advantage of a second-class lever always considered to be?
What is the mechanical advantage of a second-class lever always considered to be?
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What mechanism is responsible for decreasing heat loss from cold limbs?
What mechanism is responsible for decreasing heat loss from cold limbs?
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What is the specific heat capacity for a substance on a per kilogram basis?
What is the specific heat capacity for a substance on a per kilogram basis?
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What is the emissivity of a perfect reflector?
What is the emissivity of a perfect reflector?
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The heat capacity of a substance depends on which of the following factors?
The heat capacity of a substance depends on which of the following factors?
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The amount of heat needed to raise the temperature of a substance one degree Celsius is defined as what?
The amount of heat needed to raise the temperature of a substance one degree Celsius is defined as what?
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If Q is the amount of heat added, what is the correct formula for calculating heat capacity C?
If Q is the amount of heat added, what is the correct formula for calculating heat capacity C?
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Which of the following represents absolute zero?
Which of the following represents absolute zero?
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What does a large heat capacity imply about the heat needed for temperature increments?
What does a large heat capacity imply about the heat needed for temperature increments?
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Study Notes
Definitions
- Heat: Amount of thermal energy transferred between objects due to a temperature difference.
- Temperature: Measure of the average kinetic energy of particles in a substance.
- Zeroth law of thermodynamics: If two systems are each in thermal equilibrium with a third system, they are in thermal equilibrium with each other.
- Absolute zero: The lowest possible temperature. At this point, particles have minimal kinetic energy.
- 1 kcal: Unit of heat equal to 1000 calories.
- British thermal unit (BTU): Unit of heat.
- Heat capacity C: The amount of heat required to raise the temperature of an object by 1 degree Celsius.
- Specific heat capacity: The amount of heat required to raise the temperature of 1 kilogram of a substance by 1 degree Celsius.
- Power: Rate at which work is done or energy is transferred.
- Latent heat: Heat absorbed or released during a phase change of a substance without a change in temperature.
Heat Transfer Mechanisms
- There are three different mechanisms of heat transfer: conduction, convection and radiation.
Heat Capacity
- Heat capacity depends on the type of substance and mass of the substance.
- Heat capacity is always positive.
Additional Concepts
- Sea breeze is an example of convection.
- The unit of radiated power is watt.
- Work done is zero if the force acting on an object has no component in the direction of motion.
- If heat is removed from a system, the sign of heat transfer (Q) is negative.
- Positive heat transfer means heat is added to the system.
- Vacuum in thermos bottles reduces heat transfer by conduction and convection.
- Counter-current heat exchange is a method for heat transfer, often found in organisms.
- Mechanical advantage of second-class levers is always greater than one.
- 86 °F corresponds to 30 °C
- Heat is transferred from hot objects to cold objects.
- One kcal raises the temperature of 1 kg of water by 1 °C.
- Unit of latent heat is J/kg.
- The unit of heat capacity is J/kg °C or J/kg.K
- The unit of specific heat capacity is J/kg °C or J/kg.K
- Heat capacity is positive.
- The silver film in thermos bottles reduces heat transfer by radiation.
- Heat transfer in conduction is directly proportional to the hot area.
- Perfect reflectors in heat transfer have an emissivity of one.
- All objects have an emissivity value between 0 and 1.
- Heat capacity depends on the type of substance.
- Specific heat capacity is independent of mass.
- The lowest temperature is absolute zero.
- Specific heat capacity is the amount of heat required to raise the temperature of a unit mass of a substance by 1 degree Celsius.
- Amount of heat needed to raise the temperature one degree Celsius is called heat capacity or specific heat capacity.
- Amount of heat to increase temperature of 1kg of water from 14.5 °C to 15.5 °C is 1kcal.
- Countercurrent exchange decreases heat loss.
- Objects with large heat capacity require more heat for a given increase in temperature.
- Rate of change of internal energy is called metabolic rate.
Temperature Conversion and Calculations
- Provide specific calculations for different temperature conversions.
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Description
Test your knowledge on key thermodynamic concepts such as heat, temperature, and heat capacity. This quiz covers essential definitions and principles that form the foundation of thermodynamics. Perfect for students seeking to understand energy transfer and thermal equilibrium.
