A toy cart is tied to the end of an unstretched string of length ' 
'. When revolved, the toy cart moves in horizontal circle with radius ' 
' and time period 
. If it is speeded until it moves in horizontal circle of radius ' 
with period 
, relation between 
and 
is (Hooke's law is obeyed)
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
The extension in the string in first case 
From Hooke's law, 
or 
In second case, 
Dividing eqn (i) by eqn (ii), we get
or 
or 
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