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What is a monopoly?

By technical definition a monopoly is a firm which holds 100% of a market, however in the UK the competition authorities define a legal Monopoly as a firm holding over 25% power within a market. Monopolies a...
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Answered by Meerav S. • Economics tutor
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What tensions exist within Liberal Democracy?

Liberal democracy is defined as a democratic system of government in which individual rights and freedoms are officially recognized and protected, and the exercise of political power is limited by the rule o...
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Two balls of mass 3kg and 7 kg respectively move towards one another with speeds 5ms^-1 and 2ms^-1 respectively on a smooth table. If they collide and join, what velocity do they move off with?

m = 3kg ; 7kg u = 5ms^-1 ; -2ms^-1 (Taking the direction to the right as positive). momentum before = m1u1 + m2u2 = (3x5) + (7x-2) = 1 momentum after = (m1+m2)v2 = (3+7)v = 10v By the principle of conservati...
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Answered by Aimee G. • Physics tutor
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What is the Mixolydian mode?

Musical 'modes' are basically a set of tonalities deriving from a normal natural major scale. With C major, for example, it seems obvious that one should begin and end on C: C-D-E-F-G-A-B-C. But what if we u...
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Answered by Eric G. • Music tutor
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If y=3x^3e^x; find dy/dx?

Using the product rule we know that dy/dx = uv' + vu' where u = 3x^3; v = e^x. e^x differentiates to itself multiplied by any number in front of the x. u' = 9x^2; v' = e^x. Therefore dy/dx = 3x^3e^x + 9x^2e^...
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Answered by Aimee G. • Maths tutor
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