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John runs a sandwich shop in his local village and has 4 employees. Which of the following represents a variable cost to John? i) Insurance of the shop ii) Wages paid to his employees iii) Rent to the landlord iv) Gas due to heating

A variable cost is a cost to a business or individual which changes with respect to the amount of output whilst a fixed cost is one that will remain constant, irrespective of the amount of output by the indi...
GS
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A car horn has a frequency of 680 Hz and a wavelength of 50cm. Calculate the speed of the sound waves produced by the car horn:

velocity (v) = frequency of the wave (f) x wavelength of wave (in metres) (λ) 50cm in metres: 50/100 = 0.5m Therefore (v) = 680 x 0.5= 340 (m/s)
GS
Answered by Gunchit S. • Physics tutor
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What was the reason for the British attack at the Somme? (Example of 4 mark question)

The Battle of the Somme in 1916 is known as one of the most bloody battles that Britain has participated in, with estimates that over one million soldiers had died by its conclusion in November.The primary r...
CF
Answered by Cameron F. • History tutor
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What is endosymbiotic theory?

Endosymbiotic theory explains the origin of eukaryotic cells. Eukaryotes (cells that contain membrane bound organelle) are believed to have evolved from prokaryotic cells (unicellular organism that lacks mem...
LP
Answered by Louisa P. • Biology tutor
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Describe ethical considerations related to research at the biological level of analysis

The case study of HM Patient HM was a significant case study for neurological research in the 20th century; after a brain operation, patient HM lost his ability to remember information. More specifically, pa...
CG
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