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What is the difference between internal energy, temperature, and heat?

Internal energy , temperature , and heat are closely related but distinct concepts. The microscopic particles that make up a body are in constant motion and may exert forces on each other. As such, they each...
SK
Answered by Sotirios K. • Physics tutor
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Sound waves are longitudinal. Describe a longitudinal sound wave.

There are two types of wave: longitudinal and transverse. It's really important to learn their properties as this is a very common question. The main thing to remember is longitudinal waves have oscillations...
IS
Answered by Isabel S. • Physics tutor
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Explain what is meant by tensile stress and tensile strain.

Tensile stress is the force exerted per unit cross-sectional area on an object. Tensile strain is the extension per unit original length of an object.
PJ
Answered by Penelope J. • Physics tutor
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State what is meant by isotopes?

Isotopes are atoms with the same number of protons, but a different number of protons. Therefore, isotopes have the same atomic number but a different mass number. An example of an isotope is carbon-13, an i...
CH
Answered by Charlie H. • Physics tutor
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Compare the advantages and disadvantages of the two methods of generating electricity (figure 1 in answer):

Figure 1 (AQA GCSE Science A Physics: Higher Tier): The wind turbine costs £50 000 to buy and install. The hydroelectric generator costs £20 000 to buy and install. The average power output from the wind tur...
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Answered by Charlie H. • Physics tutor
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