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A particle of mass 0.8 kg moving at 4 m/s rebounds of a wall with coefficient of restitution 0.3. How much Kinetic energy is lost?

Coefficient of Restitution (CoR): Speed of Approach x CoR = Speed of Seperation 4 x 0.3 = 1.2 ms -1 Kinetic Energy (KE) Lost: KE lost = Initial KE - Final KE Initial KE = 1/2mv 2 = 1/2 x 0.8 x 4 2 = 6.4 J Fi...
GM
Answered by George M. • Maths tutor
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What is Plato's Analogy of the Cave?

The Analogy of the Cave is a model Plato used in Book VII of The Republic to explain his metaphysical Theory of the Forms It is composed of four key elements:- The sun represents the Form of the Good. Just a...
KM
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Solve the pair of simultaneous equations; (1) y + 4x + 1 = 0, (2) y^2 + 5x^2 + 2x = 0 .

Rearrage equation (1) to make y the subject of the formula. This gives y = -4x -1 . Substitute this value of y into equation (2). This gives (-4x -1)^2 +5x^2 +2x = 0 . Expanding out the brackets gives 16x^2 ...
MG
Answered by Melanie G. • Maths tutor
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Outline Descartes’ ‘evil demon’ argument and explain what he says about knowledge of the self.

In the First Meditations, Descartes aims to determine which of his many beliefs amount to knowledge. Descartes argues that if there is any doubt regarding the truth of a proposition, one does not know that p...
AO
Answered by Angie O. • Philosophy tutor
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Equilibrium of supply and demand

graph explanation, look at excess supply and excess demand, how increasing demand will lead to an increase in price and an increase in supply will lead to a decrease of the price. This will always converge t...
AB
Answered by Alex B. • Economics tutor
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