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With reference to two volcanic events that you have studied from contrasting areas of the world, compare the ways in which volcanoes and their hazards have been managed.

The management of a volcanic hazard can help to greatly reduce the negative impacts that an eruption can have on the population surrounding the area. The eruption of Nevado del Ruiz, Columbia, on the 13 th o...
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Answered by Laura S. • Geography tutor
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How do I calculate the reactant forces for the supports of the beam where the centre of mass is not same distance from each support?

This can be done by taking moments. To reduce the number of equations a moment should be taken so that one of the forces goes through the centre of place from which moments are being taken. We will choose to...
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Answered by Benjamin W. • Maths tutor
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Ignoring air resistance, use an energy argument to find the speed of a ball when it hits the ground if it is dropped from 50m, where m is the mass of the ball.

Original energy: GPE=50 9.81 m KE=0 Final energy: GPE=0 KE=(1/2)mv 2 Therefore (1/2)mv 2 = 50 m 9.81 . The m cancels and simplifying the equation we are left with v 2 = 50 2 9.81, therefore v = 31 ms -1
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Answered by Zach T. • Physics tutor
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Explain the role of the diaphragm in breathing out

The external intercostal muscles contract which moves the diapraghm upwards. This reduces the volume of the thorax and therefore with less space, the pressure in the lungs goes up. The pressure in the lungs ...
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Answered by Kai A. • Biology tutor
13535 Views

If f(x)= ln(x^2)-4, give f^-1(x)

For this question we would start by making f(x)=y. As we know the laws of logs, we can say that ln(x 2 )=2ln(x), therefore our equation can now be written as y= 2ln(x) - 4 . From this point, we want to make ...
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Answered by Zach T. • Physics tutor
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