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Differentiate F(x)=(25+v)/v

Whenever there is an equation in the form f(x)=u/w, the quotient rule tells us that: f '(x)= [w(du/dx)-u(dw/dx)]/v 2 *It looks complecated but if you break it down, it is simple. All you need is u, v, du/dx ...
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Answered by Nathaniel S. • Maths tutor
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A cup of tea contains 175 g of water at a temperature of 85.0 °C. Milk at a temperature of 4.5 °C is added to the tea and the temperature of the mixture becomes 74.0 °C. What is the internal energy lost by the water? What is the mass of the milk?

(a) In a question like this, you will be given that the Specific Heat Capacity of water is 4200Jkg -1 K -1 . However, commiting this to memory will be helpful. Start with the equation: E=mC(T 1 -T 0 ) Find w...
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Answered by Nathaniel S. • Physics tutor
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How do I overcome prenunciation problems?

When learning German, English learners can find it rather difficult to adapt to the accent and pronunciation of particular words and sounds. Typical mistakes - 'v' sound (supposed to be pronounced as 'f') - ...
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Answered by Paige R. • German tutor
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Why are food chains rarely longer than three or four stages?

A lot of energy is lost at each level
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Answered by Paul W. • Biology tutor
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Define 'biomass'

The dry mass of an organism
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Answered by Paul W. • Biology tutor
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