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Daniel [21]
3 years ago
6

A pendulum has 711 J of potential energy at the highest point of its swing. How much kinetic energy will it have at the bottom o

f its swing? ______ Joules......I would prefer an explanation on how the answer was obtained. 
I figured it out!!!! 
PE=KE soooo
711 J of PE = 711 J of KE

Physics
1 answer:
Anika [276]3 years ago
7 0
According to law of conservation of energy, 
<span>Energy can neither be constructed nor be destroyed but can be transformed from one form to another.
</span>
<span>At the highest point of the pendulum(point b), pendulum is associated with potential energy only and no kinetic energy.
</span><span>Therefore total energy at point b = potential energy = 711 J.... i
</span>
<span>At the bottom most point(point a), pendulum is associated only with kinetic energy and no potential energy.
</span>Therefore total energy at point a = kinetic energy ---- ii
<span>From i and ii,
</span>Kinetic energy = potential energy = 711 J.(Conserving energy)

Hence kinetic energy at the bottom most point is 711 J.
Hope this helps!!

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Answer: The value of the dielectric constant k = 1.8

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If C= ε A/d and

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Substitutes C in the first formula into the energy formula.

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Let us remember that electric field strength E is the ratio of potential V to the distance d. Where V = Ed

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d will cancel one of the ds

W = 1/2 × ε Ad × E^2

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Where Ad = volume V

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Let first calculate the dielectric strength

2800 = 1/2 × 8.84×10^-12 × E^2

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The permittivity of the material will be achieved by using the same formula

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ε = 1.57 × 10^-11

Dielectric constant k = relative permittivity

Relative permittivity is the ratio of the permittivity of the material to the permittivity of the vacuum in a free space. That is

k = 1.57×10^-11/8.84×10^-12

k = 1.776

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