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Units And Measurement

Question
CBSEENPH11020292
Wired Faculty App

A hoop of radius r and mass m rotating with an angular velocity ω0
is placed on a rough horizontal surface.The initial velocity of the centre of the hoop is zero. What will be the velocity of the centre of the hoop when it ceases to slip?

  • rω0/4

  • rω0/3

  • rω0/2

  • rω0

Solution

C.

rω0/2

From conservation of angular momentum about any fixed point on the surfacemr squared straight omega subscript 0 space equals space 2 mr squared straight omega therefore space straight omega space equals space straight omega subscript 0 over 2 therefore space straight V subscript CM space equals fraction numerator straight omega subscript 0 straight r over denominator 2 end fraction space

Some More Questions From Units and Measurement Chapter

Define physical quantity.

 

Give four examples of physical quantities.

Define unit.

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?

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