The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to...(mm)2 from Physics Units and Measurement Class 11 Manipur Board
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Units and Measurement

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Physics Part I

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Physics

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The surface area of a solid cylinder of radius 2.0 cm and height 10.0 cm is equal to
...(mm)2

1.5 x 104 mm2

The total surface area of a cylinder of radius r and height h is

S = 2πr (r + h).

Given space that comma space

straight r space equals space 2 space cm space equals space 2 cross times 10 space mm space equals space 20 space mm space

straight h space equals space 10 space cm space equals 10 space cross times 10 space mm space equals space 100 space mm space

So comma space

Surface space area comma space straight S space equals space 2 cross times 3.14 cross times 20 cross times left parenthesis 20 plus 100 right parenthesis

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 15072 space

space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals space 1.5 space cross times 10 to the power of 4 space mm squared

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Give four examples of physical quantities.

Examples of Physical quantitie are force, mass, density and power.
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What is measurement?

Measurement is the process of attaching a numeric value to an aspect of a natural phenomenon. Measurement is making the quantitative knowledge of a physical quantity. 
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Define unit.

The quantity used as a standard of measurement is called unit. 

Example: Unit of time is second. 

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Define physical quantity.

 


A measurable quantity in terms of which laws of Physics can be expressed is called physical quantity.

The result of a measurement of a physical quantity is expressed by a number accompanied by a unit.


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What is the need of measurement?

To get the complete knowledge of any physical quantity, measurement is needed. Measurement of any physical quantity involves comparison with a certain basic, arbitrarily chosen, internationally accepted reference standard called unit. Knowledge without measurement is incomplete and unsatisfactory. 
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