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What is the change in temperature of 2kg of water heated by a kettle using a voltage of 230V at 0.5A of current for 10 seconds? Assume no heat losses.

specific heat capacity of water, c = 4200J/kgK First student should understand that due to no heat losses the energy provided by mains socket to kettle is the same energy as the heat which changes the water ...
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Answered by Will S. • Physics tutor
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Explore the view that there is no clear distinction between Blake's depictions of innocence and experience

Although most poems in Blake's 'Songs of Innocence and Experience' can be paired together, the two "Holy Thursday"'s and "The Chimney Sweeper"'s are perhaps best placed to directly compar...
Answered by • English Literature tutor
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Use the geometric series e^(ix) - (1/2)e^(3ix) + (1/4)e^(5ix) - ... to find the exact value sin1 -(1/2)sin3 + (1/4)sin5 - ...

S = e ix - (1/2)e 3ix + (1/4)e 5ix - … is an infinite geometric series, equal to a/(1 - r). a = e ix and r = (1/2)e 2ix thus S = e ix /(1+(1/2)e 2ix = 2e ix /(2+e 2ix ). Rationalising the denominator: S = 2e...
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Describe the process of synaptic transmission at the neuromuscular junction.

The neuromuscular junction describes the chemical connection between a presynaptic nerve, and the muscle fibre membrane (sarcolemma). Depolarisation of the presynaptic nerve membrane (by propagation of an ac...
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Answered by Eleanor M. • Biology tutor
2791 Views

Find the coordinates of the sationary points on the curve x^2 -xy+y^2=12

To find stationary points, we need to find dy/dx and set it equal to 0. Here we must use implicit differentiation: d/dx(x 2 ) + d/dx(-xy) + d/dx(y 2 ) = d/dx(12). Hence 2x - x(dy/dx) - y + 2y(dy/dx) = 0. Fac...
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Answered by Adam B. • Maths tutor
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