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Explain what is meant by a multiple hazard zone. (4 marks)

A multiple hazard zone is a location where two or more geophysical and hydrometeorological hazards can occur at any point. An example of this is the Philippines; it is susceptible to the occurrence of Typhoo...
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Answered by Dani T. • Geography tutor
10133 Views

Describe the sequence of events that lead to the generation of an action potential

1 - Stimulus excites the neurone cell membrane, causing sodium ion channels to open, so sodium ions diffuse into the neurone, making it less negative. This depolarises the inside of the membrane.2 - Depolari...
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Answered by Matthew T. • Biology tutor
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The perimeter of a right-angled triangle is 60 cm. The lengths of its sides are in the ratio 3 : 4 : 5. Calculate the area of the triangle.

We are given ratios of side lengths and the total perimeter. The perimeter of the triangle is simply the sum of the side lengths. Imagine that the sides are made up of "units": 3 times a unit + 4 t...
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Answered by Viktoria N. • Maths tutor
3582 Views

How do I solve a sum of equations with unknowns in the denominator?

First, you need to make sure that each equation has a common denominator. You do this by multiplying the numerators of each equation with the denominators of the others. This allows you to form one algebraic...
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Answered by Kai H. • Maths tutor
3412 Views

Given that during a total solar eclipse the Sun is fully hidden by the Moon, calculate the radius of the Moon. (You may use the following: Solar radius 700,000 km, Sun-Earth distance 150,000,000 km, Moon-Earth distance 400,000 km)

Let's prepare a diagram with the Sun on the right, Moon in the middle and Earth on the left. Their centres are collinear. Moreover, draw right angled triangles such that the right angle opens from the centre...
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Answered by Viktoria N. • PAT tutor
2875 Views