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Motion in A Plane

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Physics Part I

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Class 10 Class 12
An aircraft is flying at a height of 3400 m above the ground. If the angle subtended at a ground observation point by the aircraft positions 10s apart is 30°, what is the speed of the aircraft?

The aircraft takes 10s to go from A to B and AB subtends an angle of 30° at O.

Height of the aircraft from the groun = 3400 m

In right angled triangle OAC,

AC = OC tan 15°

     = 3400 x 0·2679

     = 911m

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Now, the speed of aircraft is,

space space straight v equals AB over straight t equals 1822 over 10 equals 182.2 space straight m divided by straight s 


Give three examples of vector quantities.

Force, impulse and momentum.

What is a vector quantity?

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

Give three examples of scalar quantities.

Mass, temperature and energy

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. 


What is a scalar quantity?

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