MCQ
As the temperature of water increases, its viscosity
- ARemains unchanged
- ✓Decreases
- CIncreases
- DIncreases or decreases depending on the external pressure
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($A$) For $\mu \neq 0$ and $a \rightarrow 0, h_m=b / 2$
($B$) For $\mu \neq 0$ and $a \rightarrow b, h_m=b$
($C$) For $h=h_m$, the initial angular velocity does not depend on the inner radius $a$.
($D$) For $\mu=0$ and $h=0$, the wheel always slides without rolling.