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Explain what happens in terms of current induced as a magnet enters a solenoid in a closed circuit, and as it leaves.

This is an application to Faraday's and Lenz' laws of electromagnetic induction. So as the magnet moves into the coil, the magnetic field from the magnet moves through the coil, therefore there is a change i...
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Answered by Danruh L. • Physics tutor
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Find the equation of the tangent line to the curve y = 2x^2 - 4x + 3 at the point (3,9)

To find the equation of the tangent line to the curve y = 2x 2 - 4x + 3, we have to differentiate. Taking each part of the equation separately, we can calculate dy/dx = 4x - 4. By differentiating the equatio...
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y = 1/x^2, differentiate y (taken from AQA 2018 past paper)

y = 1/x^2 is the same asy = x^-2 , now we can use the standard differentiation formula nx^n-1 to gety = -2x^-3y = -2/x^3
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Define the term empirical formula. Determine the molecular formula of a compound with the empirical formula C2H4O and a relative molecular mass of 176.0

Empirical formula is the simplest whole number ratio of atoms of each element in a compound. With the empirical formula and relative molecular mass, we can determine the actual molecular formula of a compoun...
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What is the derivative of distance with respect to time.

The derivative of distance with respect to time is velocity.
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