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Describe Newton's second law.

Newton's second law, F=ma, describes the relationship between an external force on an object F, the mass of the object m and the resulting acceleration of the object a. We can see that the acceleration of th...
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Answered by Harry B. • Physics tutor
3598 Views

why is sin(x) squared plus cos(x) squared 1?

Thinking of sine and cosine as ratios of side lengths in a right angled triangle, sin(x) = o/h and cos(x) = a/h, so the sin(x)^2 + cos(x)^2 becomes (o^2 + a^2)/h^2. By Pyhtagoras, o^2 + a^2 = h^2, so we get ...
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Answered by Matthew S. • Maths tutor
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I don't understand acceleration and how something can accelerate without speeding up.

For this we must take a step back and analyse the meaning of acceleration. Acceleration is a change in VELOCITY - this is very important. Velocity is speed in a particular DIRECTION. You may be confusing vel...
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Answered by Jana S. • Physics tutor
7939 Views

Historiography is necessary to get a grade 7 in IB History but I don't understand how to include it in my essays

History is all about evaluating and critically analysing events and historical happenings. Including historiography in essays is very simple - you only need include an idea and the name of the historian or s...
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Answered by Jana S. • History tutor
6604 Views

What is the Dopamine Hypothesis of Schizophrenia?

The dopamine hypothesis of schizophrenia states that symptoms may be caused by an excess of dopamine in the mid-brain and a reduction in dopamine in the prefrontal cortex. This hypothesis came from the findi...
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Answered by Rosie M. • Psychology tutor
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