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Describe how a stationary wave is formed and some of its properties.

Stationary waves are waves that do not transfer energy. These occur where both ends of the wave are in fixed positions. An example of this would be a string on a violin. As the wave reachs the end of t...

Answered by Matthew H. • Physics tutor

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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 ...

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 e...

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 pr...

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...

Answered by Richard M. • Maths tutor

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