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A man decides to shoot a rifle whilst on a wheelchair. Explain in terms of conservation of momentum what happens to the man as the shot is fired.

Assume that initially the wheelchair is stationary. When the rifle is fired a bullet travels in the forward direction. Conservation of momentum states that the momentum before an action is the same as the mo...
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Answered by Matthew H. • Physics tutor
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Why does copper make a good metal to use in electrical wiring?

Copper, like all metals, is a conducter of electricity. Copper is particularly effective because of the way its electrons are arranged allows for more free movement of electrons which allows for more efficie...
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Answered by Matthew H. • Chemistry tutor
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The region R is bounded by the curve y=sqrt(x)+5/sqrt(x) the x-axis and the lines x = 3, x = 4. Find the volume generated when R is rotated through four right-angles about the x-axis. Give your answer correct to the nearest integer.

The general formula for a volume of rotation is pi times the integral of y^2. The first step is to square y. this can be done by squaring the first term, squaring the last term and finding twice the product....
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Answered by Matthew H. • Maths tutor
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Rationalise the denominator of the following fraction: 1/(√2 + 1)

We start with 1/(√2 + 1) Normally with rationalising surd denominators we multiply the top and bottom of the fraction by the denominator. But this time we have a surd ADDED by a rational number. In this case...
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Answered by Richard M. • Maths tutor
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The Curve C has the equation 2x^2-11+13. The point Q lies on C such that the gradient of the normal to C at Q is -1/9. Find the x-co-ordinate of Q

The first ste here is the find the general equation for the gradient tangential to the curve. This is done by differentiation of the equation to give 4x-11=dy/dx. dy/dx is the gradient. Now we are given the ...
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Answered by Matthew H. • Maths tutor
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