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It takes 4200 Joules to heat up 1 kg of water by 1 C^o. If you have a kettle with a power of 2500 Watts, how long will it takes to boil 0.8 kg of water from an initial temperature of 25 C^o to the nearest second??

Energy required calculated using the equation for specific heat capacity: mcdT = dE where m is mass, c is specific heat capacity and dT is the change in temperature.
Time taken is calculated...

Answered by Benjamin C. • Physics tutor

6237 Views

For the equation x^2 - 2x - 8 = y find: (a) The roots. (b) The y-intercept. (c) The coordinate of the turning point

(a) Several methods to do this, simplest would be to factorise the quadratic into (x - 4)(x + 2) = 0 and from here see that root occur at x = 4 and x = -2.(b) Substitute x = 0 into the equation 0^2 - 2

Answered by Benjamin C. • Maths tutor

4369 Views

How can I make the cadence of my Bach chorale more sophisticated?

Let's start with a simple harmonisation of the end of a soprano melody - see figure 1 on the whiteboard. The melody is A B B C and the respective chords I have chosen are IV V V I. We therefore currently ...

Answered by Eleanor H. • Music tutor

3564 Views

(Referring to a set text e.g. Herodotus Bk. 2) Is Herodotus truly the 'Father of History', or is he the 'Father of Lies'? Use examples from the set text you have studied or other material outside this.

It is important to realise that Herodotus is unique in his approach to History. The word 'history' literally means 'enquiry', coming from the Greek 'ἱστορια', and all Herodotus does is therefore enquiring...

Answered by Darius M. • Classical Greek tutor

1022 Views

'Women are deceptive and should not be trusted in the Odyssey.' How far do you agree?

Helen, the wife of Menelaus, is one of the most untrustworthy women in the Odyssey because she leaves her husband Menelaus for the Trojan prince Paris. Furthermore, having deserted her husband, she tries ...

Answered by Darius M. • Classical Civilisation tutor

2877 Views