Pressure exerted by a gas is found to be $50\, N/m^2$ , then the value of pressure in $CGS$ system is
- A$0.5$
- B$0.05$
- C$5000$
- D$500$
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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
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