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What is the refractory period of a nerve action potential?

The refractory period is composed of two parts. The first part is the absolute refractory period in which another action potential cannot be stimulated in the nerve. In the relative refractory period that fo...
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Answered by Karthik K. • Biology tutor
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What is the difference between there major scale and the aeolian scale?

To understand the difference between these two common scales, we need to think about where all scales come from in the first place. The typical major scale, containing seven notes is where all scales will be...
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Answered by Cameron M. • Music tutor
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How does a glacier erode a landscape to form a U-Shaped valley?

A u-shaped valley starts life at high altitude near the peaks of a mountain range. As snow falls, it gradually compacts due to pressure and turns into ice. As this ice gets heavier and heavier, it becomes a ...
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Answered by Cameron M. • Geography tutor
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If a 60kg girl jumps out of a helicoptor, draw diagrams to show the forces (with values) acting on her when a) she is in freefall, b) she is accelerating at half of g (g = 10 m/s^2), c) she is travelling at a constant speed?

a) 600N arrow down for weight, no air resistance arrow, acceleration = 10m/s^2 b) 600N arrow down, 300N arrow up for air resistance, acceleration = 5m/s^2 (Using F = ma) c) 600N arrows up and down (forces ba...
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Answered by Ella J. • Physics tutor
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Differentiate and factorise y = x^2(3x + 1)

Product rule: dy/dx = uv' + u'v dy/dx = 2x(3x + 1) + x^2(3) dy/dx = 2x(3x + 1) +3x^2 dy/dx = 6x^2 + 2x + 3x^2 dy/dx = 9x^2 + 2x dy/dx = x(9x + 2)
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Answered by Ella J. • Maths tutor
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