A spherical body of mass $m$ and radius $r$ is allowed to fall in a medium of viscosity $\eta $. The time in which the velocity of the body increases from zero to $0.63$ times the terminal velocity $(v)$ is called time constant $(\tau )$. Dimensionally $\tau $ can be represented by
A spherical body of mass $m$ and radius $r$ is allowed to fall in a medium of viscosity $\eta $. The time in which the velocity of the body increases from zero to $0.63$ times the terminal velocity $(v)$ is called time constant $(\tau )$. Dimensionally $\tau $ can be represented by
- [AIIMS 1987]
- A
$\frac{{m{r^2}}}{{6\pi \eta }}$
- B
$\sqrt {\left( {\frac{{6\pi mr\eta }}{{{g^2}}}} \right)} $
- C
$\frac{m}{{6\pi \eta rv}}$
- D
None of the above
Similar Questions
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- [IIT 1992]
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- [JEE MAIN 2023]
Consider following statements
$(A)$ Any physical quantity have more than one unit
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Number of correct statement is
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$(A)$ Any physical quantity have more than one unit
$(B)$ Any physical quantity have only one dimensional formula
$(C)$ More than one physical quantities may have same dimension
$(D)$ We can add and subtract only those expression having same dimension
Number of correct statement is
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