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1. A small stone is dropped from a height of 25 meters above the ground. i) Find the time taken for the stone to reach the ground ii) Find the speed of the stone as it reaches the ground

i) Let’s first write down, as we always should, what we know and what we are searching for. We know height is 25 meters and we are searching for time, so: ℎ = 25 �� �� =? This is a case of free fall of cours...
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Answered by Petar M. • Maths tutor
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How do I know what to write in my personal statement?

You need to really show passion for your subject by saying all the things that you've done (eg. presentations, work experience, reading), but also make sure that it doesn't read like a list. You need to have...
LM
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The mass of a balloon is 0.02g before it is filled with air. After it is blown up with air the mass is 0.04g. Assuming oxygen makes up 21% of air, calculate the number of moles of oxygen in the balloon.

Mass of oxygen in balloon = 0.02 x 0.21 Mr (O2) = 16 x 2 = 32 Moles = mass / Mr = (0.02 x 0.21) / 32 = 1.31 x 10^4 moles Or 0.000131 moles
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Answered by Alice W. • Science tutor
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LAQ: Discuss the extent to which genetics influence behaviour.

According to the third principle of the biological level of analysis behaviour is innate, therefore, to a large extent behaviour has a genetic basis and can be explained using genetics and genetic inheritanc...
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Answered by Iliana M. • Psychology tutor
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Explain how atherosclerosis develops and how it leads to coronary heart disease (8)

-Atherosclerosis: hardening of blood vessels (specifically those that withstand high blood pressure, ie arteries.) Blood vessels are composed of three layers: the tunica intima, tunica media and tunica adven...
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Answered by Iliana M. • Biology tutor
4796 Views