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Describe how water moves from roots to leaves (3 marks)

Via the process of transpiration:Water is evaporated from the leaves in the canopy. Due to capillary action, this causes more water to move up the plant through the xylem vessels to replace the water as it i...
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Answered by Laura N. • Biology tutor
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y = e^(e^x). Show that the curve has no maxima or minima for any real number.

dy/dx = (e^x)*(e^(e^x)) which is never equal to zero so it does not have any maximum or minimum.
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Answered by Pablo M. • Maths tutor
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Ms Henderson has two jars of sweets. The jars contain the same number of sweets in total. 25% of the sweets in Jar A are mint. Two fifths of the sweets in Jar B are mint. There are 10 mint sweets in Jar A, how many mint sweets are there in Jar B?

For this question we should be familiar with percentages and their equivalents in fraction. Since they have the same number of sweets, we calculate first the total number of sweets there is in the jars and w...
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Answered by Pablo M. • Maths tutor
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Differentiate with respect to x. y(x) = e^(7x^2)

dy/dx = 14xe^(7x^2)
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Answered by Pablo M. • Maths tutor
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A pipe has one open and one closed end. Determine the ratio of the frequency of the first harmomic to that of the next harmonic.

The first harmonic has wavelength λ 1 = 4L and the next harmonic has wavelength λ 2 = 4L/3 . Hence :f 1 /f 2 = (4L/3)/4L = 1/3
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Answered by Pablo M. • Physics tutor
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