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Assuming the Earth is a perfect sphere of radius R. By how much would your mass (m), as given by a scale, change if you measured it on the north pole and on the equator?

The key observation here is that the Earth is spinning (angular velocity w) and so are you. The scale will give one number or another depending on the force that you exert on it, and by Newton's 3rd Law t...

Answered by Javier P. • Physics tutor

1908 Views

Describe the differences between DNA and RNA. (3 marks)

Any 3 from:DNA is double stranded, whereas RNA is single strandedDNA consists of Deoxyribose sugar, whereas RNA is made from Ribose sugarThymine can be found in DNA, whereas it is replaced by Uracil in RN...

Answered by • Biology tutor

1899 Views

Add the fractions 2/5 + 3/7.

We must find a common denominator between the fractions to be able to add them (the bottom numbers must be the same). A common denominator of 5 and 7 is 35. To get to 35 from 5 we multiplied by 7, therefo...

Answered by Alex L. • Maths tutor

12256 Views

Find the length of AB from the right-angle triangle ABC. Angle ACB = 40 degrees and side BC = 15cm.

Label each of the sides using the angle BCA. Therefore, AC = Adjacent, BC = Hypotenuse and AB = Opposite. Use the anagram SohCahToa to identify the side that we have (BC) and the side we are looking for (...

Answered by Alex L. • Maths tutor

3413 Views

Why should decisions made by courts yesterday be binding on courts when they make decisions today?

This a question about the procedural elements of law, questioning precedent. First, aim to tackle the assumptions within the question and whether you agree with them.
Assumption number 1: That decisi...

Answered by • Law tutor

1343 Views