What is the $SI$ unit of density?
- A$kg \cdot dm^3$
- B$kg \cdot m^{-3}$
- C$kg \cdot m^3$
- D$kg \cdot dm^{-3}$
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The value of acceleration due to gravity is $9.8 \, m s^{-2}$. Its value in $ft/s^2$ is approximately:
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$(a)$ $1 \, rad = \dots \text{ degrees}$
$(b)$ Light year is a unit of $\dots$
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$(a)$ $1 \, rad = \dots \text{ degrees}$
$(b)$ Light year is a unit of $\dots$
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