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On a see-saw Mary, weight 600N balances John, weight 200N when she sits 1.5m away from the pivot. How far from the pivot is John?

Using the knowledge that the moments are balanced, we can create an equation to calculate the distance John is from the pivot: 600N 1.50m = 200N (distance) (600/200)*1.5 = distance distance = 4.5m
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Answered by Alexander N. • Physics tutor
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The loudspeaker produces a sound wave with a frequency of 850 hertz and a wavelength of 0.4 metres. Calculate the speed of this sound wave. Give the unit

The speed of a wave is given by "Frequency*Wavelength=Wave speed". Hence, the speed is 340. With the units of speed being m/s
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Answered by Alexander N. • Physics tutor
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How do I write a good introduction to an essay?

The introduction to your English essay is all about opening up, clearing up and getting your readers prepared for the nature of your answer. In other words, the introduction should warm your reader up to the...
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How do you form the simple future tense?

In French, they are three groups of verbs, verbs that end in -er (eg manger), verbs that end in -ir (finir), and verbs that end in -re, -oir, or -ir (faire, pouvoir, or devenir). The verb endings are the sam...
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Answered by Stephanie H. • French tutor
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What is the difference between Ionic and Covalant bonding?

Bonding is when two atoms join together; this happens through movements of electrons to help create a full outer shell of electrons. Ionic bonding is when this takes place between a metal and non metal atom....
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Answered by Aishah I. • Chemistry tutor
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