Heat and Internal Energy
Physics ⇒ Heat and Thermodynamics
Heat and Internal Energy starts at 7 and continues till grade 12.
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A metal block at 80°C is placed in water at 20°C. In which direction does heat flow?
Describe what happens to the internal energy of a gas when it is compressed rapidly without heat exchange.
Describe what happens to the internal energy of a system when it is cooled.
Explain the difference between heat and internal energy.
A 100 g sample of water is heated from 25°C to 75°C. If the specific heat capacity of water is 4,200 J/kg·K, calculate the heat absorbed.
A 2 kg block of iron is heated from 20°C to 50°C. If the specific heat capacity of iron is 450 J/kg·K, how much heat is required?
A gas is compressed by doing 150 J of work on it, and 50 J of heat is removed from it. What is the change in internal energy?
A metal block at 80°C is placed in water at 20°C. In which direction does heat flow?
Which of the following best defines internal energy? (1) The energy stored in the bonds of molecules (2) The total kinetic and potential energy of the particles in a substance (3) The energy required to raise the temperature of a substance by 1°C (4) The energy transferred from a hotter object to a colder one
Which of the following best describes conduction? (1) Transfer of heat through direct contact (2) Transfer of heat by movement of fluids (3) Transfer of heat by electromagnetic waves (4) Transfer of heat by chemical reaction
Which of the following is an example of heat transfer by radiation? (1) Boiling water (2) Sunlight warming your skin (3) Heating a pan on a stove (4) Ironing clothes
Which of the following is NOT a method of heat transfer? (1) Conduction (2) Convection (3) Radiation (4) Reflection
Fill in the blank: The sum of the kinetic and potential energies of all the particles in a system is called its ________.
Fill in the blank: The transfer of heat by the movement of a fluid is called ________.
Fill in the blank: When a substance is heated, its particles move ________ and its internal energy ________.
The process of heat transfer that does not require a medium is called ________.
Is it possible for a system to have heat but no internal energy?
True or False: Heat is a form of energy transfer due to a temperature difference.
True or False: The internal energy of a system can be changed by doing work on it.
True or False: The internal energy of a system increases when heat is removed from it.
