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Derive the escape velocity from the surface of a planet with radius, r, and mass, M.

This question is about converting kinetic energy into gravitational potential energy. Escape velocity is the speed required to leave the gravitational field of a mass, in this case it's a planet. In other wo...
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Answered by Thomas R. • Physics tutor
22634 Views

When and how to use the imperative

La forme simple de l’imp ératif The present imperative is used to give an order or to offer advice. In the imperative mood, the subject pronoun is not used. In the imperative, verbs are only conjugated in th...
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Answered by Eliza J. • French tutor
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Which has a lower boiling point chlorine or bromine, and why?

Chlorine, as chlorine has fewer electrons shells than bromine. As a result, chlorine is smaller and has a smaller atomic radius . The difference in size, relates to boiling point of the molecule. This is bec...
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Answered by Megan F. • Chemistry tutor
75181 Views

What are the main factors that caused World War I (1914-1918)?

In order to better understand the causes of WWI, we use the following acronym- ANIMAL, which stands for Alliances: Triple Alliance (1882) of Germany, Austria-Hungary and Italy vs Triple Entente (1907) of the...
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Answered by Nghia T. • History tutor
16328 Views

How is a message transferred across a synapse?

A synapse is a junction between the end of one neuron (known as the pre-synaptic neuron ) and either another neuron (known as the post-synaptic neuron ) or another tissue such as muscle (such as at the neuro...
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Answered by Max B. • Biology tutor
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