Top answers

Why is Pluto not a planet any more?

When astronomers discovered Pluto in 1930, they were excited to announce it as the 9th planet in the solar system. The problem is, back then we didn't know that Pluto is just one of many objects floating in ...
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Answered by Ryan M. • Science tutor
6081 Views

Where does the quadratic equation come from?

This is a quick derivation of the quadratic formula for an GCSE Maths students looking to stretch themselves a little and go for that A*! If we have a general quadratic equation: ax 2 +bx+c=0 (eq1) You will ...
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Answered by Ryan M. • Maths tutor
5288 Views

Why does ionisation energy of elements generally decrease as you move down a group in the periodic table?

Ionisation energy is the energy required to remove the most loosely bound (furthest out) electron from an atom, in the gaseous state. As you move down a group in the periodic table, the number of protons in ...
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Answered by Sam B. • Chemistry tutor
7145 Views

How many different types of sentence logic relationships (sytactic relations) are there in Mandarin?

As a frequently tested point in A level papers , the logic relationships of sentences and the according conjunctions are very important in reading Chinese articles. Unlike English language, modern Chinese is...
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Answered by Xing W. • Mandarin tutor
4904 Views

Why there are multiple pronounciations for one single character in Japanese?

In Japanese writing and reading system there are two different ways to read Chinese Kanji characters: 訓読み ( kun yomi ) and 音読み ( on yomi ). Historically kun yomi is used as a way to mark the vernacular words...
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Answered by Xing W. • Japanese tutor
2792 Views