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What is osmosis and how does it work?

Osmosis is the movement of water across a semi-permeable membrane, down the concentration gradient. This means that if there is more water on one side of a membrane, it will move to the other side until both...
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Answered by Niclas W. • Biology tutor
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An electric whisk in a bakery has two motors, each with an average power of 1500W. The whisk is used for 4 hours each day, 7 days a week. Electricity costs 18p per kilowatt-hour. Calculate the cost of the electricity used by the whisk in one week.

First, we must calculate the amount of time spent using the whisk in one week:4 x 7 = 28 hours a weekNext we calculate the power used; as the whisk has two motors, the average power used by the whole whisk i...
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Answered by Iqra S. • Physics tutor
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make x the subject of 5(x-3) = y(4-3x)

step 1 ; expand the brackets5x - 15 = 4y - 3xystep 2 ; group together x values on one side5x + 3xy = 4y + 15step 3 ; single out xx (5+3y) = 4y +15step 4 ; make x the subjectx = (4y + 15) / (5+3y)
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Answered by Sofia A. • Maths tutor
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What is the Demographic Transition Model?

The Demographic Transition Model is one of the main ways we can easily understand how a population will change demographically as countries go through economic and social change. It was originally developed ...
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Answered by Edward S. • Geography tutor
4793 Views

How do you form a gerund?

2 general rules: 1) if the verb ends in "-ir" or "-er", remove the "r" and add "-iendo". 2) if the verb ends in "-ar", remove the "r" and add &quot...
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Answered by Dinesh L. • Spanish tutor
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