Two identical trains P and Q move with equal speeds on parallel tracks along the equator. P moves from east to west and Q moves from west to east. Then

JEE Main Physics question

Two identical trains and move with equal speeds on parallel tracks along the equator. moves from east to west and moves from west to east. Then

(A)Data is insufficient to arrive at a conclusion
(B)Both exert equal force on the track
(C)Train exerts less force on the track
(D)Train exerts greater force on the trackCorrect

Answer: (D)

Solution

Earth rotates west to east. Train (moving west to east, with earth's rotation) has a higher effective speed around earth's axis, requiring more centripetal force, which reduces the normal force on the track (effectively lighter). Train

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Question ID VK-154512