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How do you approach a simultaneous equations problem?

There should be at least as many simultaneous equations as there are unknown variables - or else you cannot get a numerical answer! Start by trying to eliminate one of the variables. You can multiply the equ...
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Answered by Annie H. • Maths tutor
3645 Views

When catching a ball, a cricketer moves his hands for a short distance in the direction of travel of the ball as it makes contact with his hands. Explain why this technique results in less force being exerted on the cricketer's hands

As his hand moves back with the ball, the time taken to stop the ball is greater. This means that the rate of change of momentum is less (because the rate of him changing the speed of the ball is much slower...
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Answered by Lisa W. • Physics tutor
11919 Views

What are the problems created by a country having a large population growth rate?

The example I will use is the UK. One strategy the government has used is to increase the retirement age so people are working longer. Males and females now have an equal retirement age of 65 and it will be ...
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Answered by Nikita S. • Geography tutor
3962 Views

What does Newton's First Law mean?

Newton's First Law states that an object will continue moving at the same velocity in the same direction unless a resultant force acts upon it. This applies to stationary objects too - if an object is still ...
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Answered by Annie H. • Physics tutor
3088 Views

How are membranes classified according to their permeability?

An impermeable membrane is one through which no substance can pass. Semipermeable membranes are those which only let solvents, such as water, pass through them. Permeable membranes are those which let solven...
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Answered by Adam M. • Biology tutor
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