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Describe how the average density of matter in the universe affects its ultimate fate?

There are 3 different outcomes for the fate of our universe:if the average density is smaller than what is known as the critical value, then the universe will carry on expanding forever.if the average densit...
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Answered by Rebecca N. • Physics tutor
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What is the 'centre of gravity' of an object and how do I calculate it?

The centre of gravity (or centre of mass) of an object is the point through which an object's weight will act through. In other words, the object will always balance around this point. Imagine a square book;...
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Answered by Matthew B. • Physics tutor
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What is Olbers' Paradox?

Olbers' Paradox is a famous problem which baffled many scientists in the early 19th century. The German astronomer Olbers (and many of his colleagues) made assumptions that the universe was static, of infini...
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Answered by Matthew B. • Physics tutor
13185 Views

How do capacitors work and what are its units?

Capacitors are an electrical component made up of two plates with an insulator between them. Electrons flow onto one of these plates as current flows around the circuit. This gives one of the plates a negati...
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Answered by Matthew B. • Physics tutor
4338 Views

How can an object in circular motion be accelerating when it's at the same speed?

In Physics, there are two types of numbers: scalars and vectors. Scalars are just a normal number, as we are used to. Vectors also have a direction associated with them. Thus, variables like temperature and ...
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Answered by Toby T. • Physics tutor
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