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Using the principle of the conservation of energy, calculate the maximum speed of a ball of 5.0kg that has been dropped from a height of 20m. (Given that the gravitational field strength is equal to 9.8N/kg)

Answer: 20ms -1 The gravitational potential energy before the ball is dropped is equal to mgh. This gives the ball a maximum gravitational potential energy of 5.0kg * 9.8N/kg 20m which is equal to 980 J. At ...
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Answered by Charlie H. • Physics tutor
4312 Views

A right angled triangle has two short sides of lengths 5cm and 12cm respectively. What is the length of the third side?

13cm. Using Pythagoras theorem a^2 +b^2 =c^2 we substitute our two known lengths into the equation to get 5^2 + 12^2=c^2. So now we have c^2= 25+144. So c^2 =169. So c=√169 = 13. Don't forget the units!!! So...
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Answered by Niall C. • Maths tutor
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How do you approach a question when you first receive it and then go about planning an essay?

Underline key words, ie. if the question is 'What is the significance of women in Of Mice and Men ?' you would underline 'what', 'significance', 'women' and 'Of Mice and Men'. This allows you to keep on task...
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Answered by Sofia S. • English tutor
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What is the definition of Osmosis?

Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane.
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Answered by Stuart R. • Biology tutor
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The two points (4,9) and (2,3) are on line A. A second line, line B is perpendicular to line A and goes through the point (2,3). What is the equation of line B?

Step 1, find the gradient of line A: gradient = change in y/change in x = (y1 - y2) / (x1 - x2) = 9-3/4-2 = 6/2 = 3Step 2, find the gradient of line B: as the two lines are perpendicular, the gradient of lin...
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Answered by Georgia W. • Maths tutor
3475 Views