AP EAMCET Engineering 2018 Apr 22 Shift 1 Paper

Volume increases by 9% means. its radius increases by 1% Therefore I increases and ω decreases
ω∝

1

I

∝

1

R2

∝

1

V 2 2

The change in angular speed is given as.

Δω

ω

v100=−

2

3

×

Δv

v

×100

Δω

ω

×100 =−

2

3

×0.091×100=−6%
Thus, the decrease in angular speed is 6% .