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Derive an expression for the centripetal acceleration of a body in uniform circular motion.

(I assume familiarity with positions represented by vectors and differentiation of trigonometric functions). Consider the coordinates of a point moving in a circle of radius r around the origin. The equation...
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Answered by Hubert A. • Physics tutor
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Explain the functional differences between a t-RNA and an m-RNA molecule

A tRNA molecule is one which carries an amino-acid and takes it to ribosomes to be inserted into an amino-acid sequence making a protein during the translation step of protein synthesis. An mRNA molecule is ...
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Answered by Chintan P. • Biology tutor
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The equation of a circle is x^2-6x+y^2+4y=12. Complete the square to find the centre and radius of the circle.

When we complete the square, we're looking for an equation that looks like (x-a) 2 + (y-b) 2 = r 2 , where (a,b) is the centre and r is the radius. When we expand brackets using FOIL, the x part is (x 2 -2ax...
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Answered by Hubert A. • Maths tutor
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Steinbeck presents loneliness as an inescapable part of the characters’ lives in Of Mice and Men. To what extent do you agree with this statement?

The concept of 'loneliness' is manifested in different forms through the characters in Of Mice and Men. It is necessary to consider the historical context in which the book was written in order to understand...
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Answered by Holly M. • English tutor
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What are the differences between meiosis and mitosis?

Mitosis creates 'normal' body cells, while meiosis creates sex cells, like sperm and eggs. After mitosis, there are two daughter cells. After meiosis there are 4. The daughter cells from mitosis have a the f...
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Answered by Hayley M. • Biology tutor
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