We can produce heat by________________?
Correct answer: D. All of the above
- A. Frictional process
- B. Chemical processes
- C. Electrical processes
- D. All of the above
Explanation
Heat can be generated by friction, released during chemical reactions, and produced when electrical energy is dissipated as resistance heating. Since all three processes convert other forms of energy into thermal energy, all options are included. A student may choose a because friction is the most familiar example while overlooking chemical and electrical heating.
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About Thermal Equilibrium and Heat
Thermal equilibrium means that bodies in contact have the same temperature and no net heat flows between them. The topic distinguishes heat from temperature, uses the zeroth law of thermodynamics, and covers heat transfer, specific heat capacity, thermal expansion and the conditions for reaching equilibrium.
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