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Motion in A Plane

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Physics Part I

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Class 10 Class 12
A jet airplane travelling at the speed of 500 km/hr ejects its products of combustion at the speed of 1500 km/hr relative to the jet plane. What is the speed of the later with respect to an observer on the ground?

Let the velocity of ejecting gases with respect to ground be straight V subscript straight g . 

Velocity of jet plane,    straight V subscript straight j equals plus 500 space km divided by hr

Velocity of ejected products w.r.t. jet plane, 

               straight V subscript gj equals negative 1500 space km divided by hr.

Now, relative velocity of ejecting gases w.r.t the jet plane is given by, 

                           straight V subscript gj equals straight V subscript straight g minus straight V subscript straight j

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                                equals negative 1500 plus 500 space

equals space minus 1000 space km divided by hr 


Give three examples of vector quantities.

Force, impulse and momentum.

What is a scalar quantity?

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

Give three examples of scalar quantities.

Mass, temperature and energy

What is a vector quantity?

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

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. 


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