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Units And Measurement

Question
CBSEENPH11019865
Wired Faculty App

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

Solution
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

Some More Questions From Units and Measurement Chapter

What are the two main required characteristics of a unit?

Can we use same units for different physical quantities?

Can we use different units to measure same physical quantity?

To measure a physical quantity X, the unit U is repeatedly used for n times. What is the magnitude of physical quantity?

Does the numerical factor in the quantitative measurement depend on the system of unit used?

Is one unit sufficient to measure a physical quantity?

Can a physical quantity have two or more units? Give example.

What are fundamental quantities?

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