Sawaal
18
Q:

A disk and a sphere of same radius but different masses roll on two inclined planes of the same altitude and length. Which one of the two objects gets to the bottom of the plane first ?

A) Depends on their masses B) Sphere
C) Disk D) Both reach at the same time

Answer:   B) Sphere



Explanation:

Time does not depend on mass, else

T ∞ 1 + k2R2 

 

  k2R2=> is least for 'sphere' and

 

hence least time is taken by sphere.

Subject: Physics
Exam Prep: AIEEE
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