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Grade: 11
        
Four round objects namely a ring, a disc, a hollow sphere and a solid sphere with same radius R and made of same material start to roll down an inclined plane at the same time. The object that will reach the bottom third is   
(a) Solid sphere  
 (b) disc  
(c) hollow sphere  
(d) ring 
Please help me to solve this problem.
9 months ago

Answers : (2)

Khimraj
2788 Points
							
a = gsin\Theta/(1 + I/mr2)
so higher the I less will be a and more the time taken to reach the bottom
so t \propto I
Iring = mR2
Idisc = mR2/2
Ihollow sphere =(2/3)mR2
Isolid sphere = (2/5)mR2 
so  tring > thollow sphere > tdisc > tsolid sphere 
So correct answer is Disc.
9 months ago
Abhinav Gupta
77 Points
							
 
a = gsin\Theta/(1 + I/mr2)
so higher the I less will be a and more the time taken to reach the bottom
so t \propto I
Iring = mR2
Idisc = mR2/2
Ihollow sphere =(2/3)mR2
Isolid sphere = (2/5)mR2 
so  tring > thollow sphere > tdisc > tsolid sphere 
So correct answer is Disc......
9 months ago
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