Question

) A flywheel rotates about an axis.
Due to friction at the axis,it experiences an angular retardation proportional to its angular velocity. If its angular velocity fall to half while it makes 'n' rotation, how many more rotation will it make before coming to rest?

2. A small area is removed from a uniform spherical shell of mass M and radius R.
Then gravition field intensity near the hollow portion is

a) GM/ R^2
b) GM/ 2R^2
c) 3GM/2 R^2
d) zero

3. An alcohol on treatment with alkalhne KMnO4 gives brown ppt.
The alcohol is

a) (C2H5)3 COH
B) (CH3)2 C(OH)CH3
c) (CH3)2 C(OH) CH2 CH3
d) (CH3)2

Answer 1

what do you mean by removing area from a shell .? is it removing a small volume
usually all simple alcohols react with KMnO4 to give combustion like reaction and brown stain .

Answer 2

yea