If a thin disk and a hoop moving on a surface, having same mass and radius ,same angular
Acceleration, ratio of torque of disk to hoop is___
a) 1
b) 2
c) 4
d) 5

Question

If a thin disk and a hoop moving on a surface, having same mass and radius ,same angular
Acceleration, ratio of torque of disk to hoop is___ 
a) 1
b) 2 
c) 4
d) 5

anonymous · Answer

@Rohitkhanna I know I = mr^2 for hoop and for Dsic is 1/2mr^2

anonymous · Answer

torque= I x angular acceleration

anonymous · Answer

yup , but when we take ratio it comes 1:2

anonymous · Answer

grrrrrrr by mistake close it D:

anonymous · Answer

yes.both have same I.

anonymous · Answer

how they have same I ???

anonymous · Answer

@sarah786  yup ratio will be 1:2

anonymous · Answer

ok its mean options are incorrect . Thank you @sre and @Rohitkhanna

anonymous · Answer

sorry.my mistake this time.the values of I u gave r correct

anonymous · Answer

its ok ^_^ @Rohitkhanna