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Uranium -238 has a half life of 4.5 billion years. How long will it take a 2g sample of U-238 to contain just 0.4g of U-238?

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Answered by Robert E. • Physics tutor

14196 Views

Is the British Prime Minister become Presidential?

While critics seem to be regularly telling us that we are moving towards a more Americanized system characterized by a growth in spatial leadership (the presentation of the party leader as the 'relata...

Answered by Leyla R. • Government and Politics tutor

29076 Views

How are the human lungs specialised for gas exchange?

Gas exchange is when oxygen is transferred from the air in the lungs to the blood and carbon dioxide is transferred from the blood to the air in the lungs. It occurs in the alveoli of the lungs.The lungs ...

Answered by Anna D. • Biology tutor

24929 Views

When do I use the subjunctive tense?

It's better to think of the subjunctive as a mood rather than a tense. As a general rule, it is used to express a feeling of uncertainty in a sentence.

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Answered by Jordan O. • Spanish tutor

4050 Views