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Units And Measurement

Question
CBSEENPH11020696
Wired Faculty App

A gramophone record is revolving with an angular velocity ω. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is μ. The coin will revolve with the record if

  • r = μgω2

  • straight r space less than space straight omega squared over μg
  • straight r space less or equal than space μg over straight omega squared
  • straight r space greater or equal than space μg over straight omega squared

Solution

C.

straight r space less or equal than space μg over straight omega squared

When the disc spins the frictional force between the gramophone record and coin is μ mg
The coin will revolve with record, if 

straight F subscript frictional space greater or equal than space straight F space centripetal straight mu space mg space greater or equal than space straight m space straight omega squared straight r μg over straight r space greater or equal than space straight omega squared space

Some More Questions From Units and Measurement Chapter

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?

How many fundamental quantities are there in mechanics?

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