Work, Energy and Power

Physics Part I

Physics

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A tube of length L is filled completely with an incompressible liquid of mass M and closed at both the ends. The tube is then rotated in a horizontal plane about one of its ends with a uniform angular velocity ω. The force exerted by the liquid at the other end is

A.

Let the length of a small element of tube be dx.

Mass of this element

where M is mass of filled liquid and L is length of tube.

Force on this element

Let the length of a small element of tube be dx.

Mass of this element

where M is mass of filled liquid and L is length of tube.

Force on this element

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Define the unit joule.

Work done is said to be one joule if one newton of force displaces the body through a distance of one meter in the direction of applied force .

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What are different units of energy?

The different units of energy are :

(i) Joule

(ii) Erg

(iii) eV

(iv) KWh

(v) Calorie.

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