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An object is let in free fall from a platform 20m high above Earth's surface. Describe the event in terms of energy and thus determine the speed of the object when it hits ground. Air resistance is negligible and gravitational acceleration is constant.

When the object is at rest on the platform it has no kinetic energy, but only potential energy. The potential energy is m g h where m is the mass of the object, g the gravitational acceleration and h the hei...
CA
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What are the similarities/differences between neuromuscular junctions and cholinergic synapses?

There are many similarities between these two structures, the main differences are: Neuromuscular junction (NMJ) is between a neurone and a muscle. A synapse is neurone-neurone.Neuromuscular junctions are on...
Answered by • Biology tutor
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Analyse the level of economic efficiency achieved [short run] in a monopolistically competitive transport market (15 marks)

Start by defining the relevant market (e.g. monopolistic competition). This should follow along the lines of: ‘a market structure where many firms operate providing slightly differentiated goods and services...
MA
Answered by Mark A. • Economics tutor
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How can we isolate DNA from cells?

DNA isolation is important for experimental analysis and drug discovery across many biological disciplines. Firstly a cell culture must be homogenised to break down the cells into a uniform liquid, making it...
GC
Answered by George C. • Biology tutor
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What is the Hedonic Calculus?

The Hedonic Calculus is one of the central ideas of Bentham's Act Utilitarianism. Created by combining hedonism, (the pursuit of pleasures and avoidance of pains) and democracy (majority rule) the hedonic ca...
Answered by • Philosophy tutor
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