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An object of mass 3kg is held at rest on a rough plane. The plane is inclined at 30º to the horizontal and has a coefficient of friction of 0.2. The object is released, what acceleration does the object move with?

We need to use Newtons law F=ma going down the slope. We can see that the only forces acting in this direction are the component of the weight and friction, so we have that: F = Wsin30 - μR = 3a We have that...
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Answered by Asha D. • Maths tutor
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Describe how a stationary wave is formed at a boundary?

A stationary wave is a wave formed by the superposition of two progressive waves. These waves must have equal amplitude frequency and speed. They must also be travelling in opposite directions. When a wave i...
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Answered by Oliver E. • Physics tutor
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Describe how action potentials are initiated and transmitted within a neurone, mentioning the appropriate ions and types of ion channels

A stimulus causes a small influx of sodium ions into the cell, leading the cell to become more depolarised or more positive. If this reaches the threshold potential, of about -55 mV, then it will initiate an...
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Answered by Roxanne M. • Biology tutor
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Describe that lock and key hypothesis

Enzymes are biological catalysts, which means that they increase the rate of a specific reaction by lowing the required activation energy. The lock and key hypothesis explains how the substrate (key) fits in...
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Answered by William W. • Biology tutor
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Show that (sec(x))^2 /(sec(x)+1)(sec(x)-1) can be written as (cosec(x))^2.

( sec 2 (x))/((sec(x)+1)(sec(x)-1))Then, by the rule of 'difference of two squares', we know that this equals= (sec 2 (x))/(sec 2 (x)-1)= (sec 2 x/tan 2 x)since 1+tan 2 (x)=sec 2 (x), we get sec 2 (x)-1=tan ...
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Answered by Rishi S. • Maths tutor
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