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(IGCSE, Jan 2013, q8 adapted) The astronaut David Scott dropped a hammer and a feather from rest, at the same time and from the same height on the moon. The hammer and the feather landed at the same time. Why?

Central to this question is an understanding of the difference between an accelerating object and an object travelling at terminal velocity . Firstly, the experiment is carried out on the moon, which means w...
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Answered by Nadya K. • Physics tutor
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In what ways did the lives of black Americans change during WWII?

The change brought by the war for black Americans was limited and contested. The war presented new demands for labour, generating opportunities for African Americans (AA) to economically participate, gain sk...
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Answered by Abigail S. • History tutor
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Explain the unusually high boiling point of HF

Due to the high electronegativity of flourine hydrogen bonds can be formed between HF molecules. - Hydrogen bonds require more energy to break that London Forces. - The other halogens are not as electronegat...
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Answered by Chloe G. • Chemistry tutor
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Identify 3 different antibiotics and describe how they work.

Antibiotics are important for treating bacterial infections that may be making us ill. There are many different antibiotics that work in different ways, and therefore they are suitable for treating different...
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Answered by Madeleine H. • Biology tutor
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How is the perfect tense constructed?

The perfect tense is made up of two parts: the auxiliary (helping) verb and the past participle. These are two separate words and must both be present to construct the perfect tense. The auxiliary verb is ei...
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Answered by Juliet H. • French tutor
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