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Q.

A plane flies from east to west over the equator. In order that the passenger may see the sun motionless, the speed (kmph) of the plane should be

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a

182 kmh−1

b

1667 kmh−1

c

1489 kmh−1

d

1256 kmh−1

answer is C.

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Detailed Solution

To get the sun motionless the plane has to move with same speed equal to

that of earth from E to west i.e.,

Question Image                        

Speed of earth

ve=Rωe

=6400×2πcT=6400×2×3.1424

=1674.66Km/h=1667Km/h

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