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How do organisms obtain energy?

Organisms, such as humans, take in "substrates" such as glucose, in our food. During a process called respiration, we react these substrates with oxygen to give carbon dioxide and water; this takes...
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Answered by Alastair R. • Biology tutor
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Factorising and Expanding Brackets

Factorising equations: Lets look at the example: Factorise 3x+21 In order to factorise this equation, we need to find a common factor of both 3x and 21. For this equation, the common factor is 3 and so this ...
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Answered by Hannah M. • Maths tutor
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Athenodorus legit titulum auditoque pretio, quia suspecta vilitas: What was Athenodorus suspicious about?

Subject: Latin/GCSE Q: Athenodorus legit titulum auditoque pretio, quia suspecta vilitas: What was Athenodorus suspicious about? A: Athenodorus was suspicious of the cheapness (vilitas). The word 'vilitas' i...
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Answered by Hiwot A. • Latin tutor
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A lamp has a rating of 18V 9W. How much energy is transferred to the bulb in 5 minutes? Calculate the current through it when connected to a 18V supply.

The first question comes from the realisation that the power rating, "9W" represents 9 joules being supplied every second and so can be written as 9 J/s and so in 5 minutes (or 300 seconds) the ene...
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Answered by Alexander N. • Physics tutor
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Resistors of 5 ohms and 10 ohms are connected in series with a battery supplying 3 volts. What is the total resistance ? And calculate the current in the circuit.

For the first part of the question we note that the resistors are in series, this means we can simply add together the resistance, giving a value of: 15 ohms For the second part we use the equation V=IR, sub...
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Answered by Alexander N. • Physics tutor
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