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Outline the principal features of a geostationary orbit and use them to explain one use of satellites in this type of orbit.

Geostationary orbits: -have a time period of 24 hours -have an angular speed equal to that of the Earth - maintain above a fixed position on the Earth's surface at all times. Therefore, they are very good fo...
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Answered by Alex A. • Physics tutor
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What are quarks?

Quarks are the building blocks of protons and neutrons, as found in the nucleus of atoms. They are as far as we know, fundamental particles, but this could change in the future. There are 6 types, named up, ...
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Answered by Andrew G. • Physics tutor
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How would you explain general relativity?

In basic terms, general relativity is based on Einstein's equivalency principle. It states that in a closed environment, there is no way of distinguishing between the effects of gravity and of a constant acc...
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Answered by Sam C. • Physics tutor
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what depends if the universe is expanding or not

H, (see Hubble's Law)
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Answered by Huairen Z. • Physics tutor
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A wire has length l, cross-sectional area a, resistivity p and resistance R. It is compressed to a third of its original length but its volume and resistivity are constant. Show its new resistance is R/9.

First realize if its length is now l/3 but its volume is constant its cross sectional area is 3a. Substitute those into the equation for resistance R=p(l/a) and you get (1/9)(p(l/a))= R/9
TD
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