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This question is in one of the CIE Physics Pre-U sample papers, and if you know the definition of the time constant for a capacitor circuit (=RC), its very easy, however even if you didnt it canbe deri...

As this is a 40-mark question, I will not attempt to provide a full-length sample answer, but instead offer guidance on how to structure this type of question. More detailed case studies and content ad...

y = x²(cos(x)) therefore we will need to use the product rule, 

dy/dx = u dv/dx + v du/dx

where u = x² and v = cos(x)

du/dx = 2x and dv/d...

Cholera is single-celled organism that produces a toxin. The toxin attaches to the ion receptors in the small intestine which causes it to secrete chloride ions into the lumen. This then causes water t...

In formal contexts, such as job interviews or academic presentations, you shouldn't use slang or coloquial phrases, but a polite structure, such as: "Mi nombre es..." instead of "Me llam...