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Explain why the stability of a car can be improved by widening the wheel base and lowering the centre of gravity.

A car will topple over when it is tilted so far that the line of action from the centre of gravity falls outside of the wheel base, causing a resultant moment around the side being tilted. Extending the base...
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Answered by Tim H. • Physics tutor
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There are two stable isotopes of Bromine, Br-79, Br-81. If a sample of Br2 is fed into a mass spectrometer, how many peaks would be observed in the spectrum?

There should be five peaks. In the process of bombarding the Br2 molecule with electrons to charge it, the molecule can fragment into 2 Br atoms. We should therefore expect to see peaks at 79 and 81 m/z. The...
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Answered by Tim H. • Chemistry tutor
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What are the 4 phases of mitosis?

Prophase, metaphase, anaphase, and telophase.
Answered by • Biology tutor
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¿Dónde fuiste en tus últimas vacaciones?

This is a typical A-level Spanish question which requires the candidate to use the past tense.
Answered by • Spanish tutor
2831 Views

What is an antibody?

An antibody is a chemical released during an infection by lymphocytes that attach to specific antigens.
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Answered by Jonathon C. • Biology tutor
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