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Units And Measurement

Question
CBSEENPH11017652
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A motor car is travelling at 30 m/s on a circular road of radius 500 m. It is increasing in speed at the rate of 2 m/s2. What is it's acceleration? 

Solution

Here, 
Speed of motor car, v = 30 m/s 
Radius of circular road, r = 500 m 
Rate of increase in speed = 2 m/s 
To find: Acceleration of the motor car? 
We know that, 

straight a subscript straight r space equals space straight v squared over straight r space equals space fraction numerator 30 space cross times space 300 over denominator 500 end fraction space equals space 1.8 space straight m divided by straight s squared space That space is comma space straight a space equals space square root of straight a subscript straight r squared plus space straight a subscript straight T squared end root space space space space equals space square root of left parenthesis 1.8 right parenthesis squared plus space left parenthesis 2 right parenthesis squared end root space equals space 2.7 space straight m divided by straight s squared

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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