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Find the kinetic energy ofvthe body depends upon its mass and speed. Find the kinetic exoression for the kinetic energy ofvthe body using the method of dimensional analysis

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Answered by ritamriyu12
3

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11th

Physics

Units and Measurement

Dimensions and Dimensional Analysis

Derive an expression of kin...

PHYSICS

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Asked on December 26, 2019 by

Akshaya Sandu

Derive an expression of kinetic energy of a body of mass 'm' and moving with velocity 'v' , using dimensional analysis.

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ANSWER

Since we know that,

The dimension of energy [E]=[M

1

L

2

T

−2

]

The dimension of mass [M]=[M

1

L

0

T

0

]

Dimension of velocity[V]=[M

0

L

1

T

−1

]

Let [E]=k[M]

x

[V]

y

Where k is the proportionality constant which is a dimensionless quantity.

Therefore,

[M

1

L

2

T

−2

]=k[M

1

L

0

T

0

]

x

[M

0

L

1

T

−1

]

y

So, x=1,y=2

Thus, We have

E=kmv

2

It is found that k=

2

1

Hence, E=

2

1

mv

2

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