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Motion in A Plane

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Physics Part I

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Physics

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

A river d km wide is flowing at rate straight v subscript 1 straight m divided by straight s. A swimmer who can swim with velocity straight v subscript 2 straight m divided by straight s relative to water wants to cross the river straight across. How long will he take to cross the river?


Width of the river = d km 

Rate of flow of river = v1 m/s

Rate at which the swimmer is swimming = v2 m/s

So, time taken by the man to cross the river is, 

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103 Views

What is a vector quantity?

A physical quantity that requires direction along with magnitude, for its complete specification is called a vector quantity.
835 Views

What is a scalar quantity?

A physical quantity that requires only magnitude for its complete specification is called a scalar quantity.
1212 Views

What are the basic characteristics that a quantity must possess so that it may be a vector quantity?

A quantity must possess the direction and must follow the vector axioms. Any quantity that follows the vector axioms are classified as vectors. 


814 Views

Give three examples of vector quantities.

Force, impulse and momentum.
865 Views

Give three examples of scalar quantities.

Mass, temperature and energy
769 Views