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This is the amount of energy needed to heat 1kg of the material by 1 degree: ENERGY to heat a MASS by a TEMPERATURE INCREASE.
Usingstandard units:Energyis in Joules [J]Massis in kilograms [kg]Tempera...

Firstly, I would suggest that we draw a diagram to visualise the problem. Using the diagram and knowledge of rectangles, you can see that the rectangle is made of two right angled triangles. Thus we can u...

Firstly, to expand the brackets, we can use the FOIL method to multiply them out.First - multiply the first numbers of each bracket. 3x * 4x = 12x^2Outer - multiply the outer numbers of each...

if you are looking at a far away object, your eyes don’t need to refract the light too much in order to focus it onto the retina. So in this case the lens shape should be flat instead of fat. And how this...

Total wage each week= £420. In one week, he saves 15% of this: 15% of 420 is 0.15 x 420 = £63. So he saves £63 in one week. To calculate the total number of weeks it takes to save up for the phone, divide...