Which of the following is dimensionally incorrect?
$u^2=2 a(g t-1)$
$s-u t=\frac{1}{2} a t^2$
$u=v-a t$
$v^2-u^2=2 a s$
If $A$ and $B$ are two physical quantities having different dimensions then which of the following can't denote a physical quantity?
Planck's constant $h$, speed of light $c$ and gravitational constant $G$ are used to form a unit of length $L$ and a unit of mass $M$. Then the correct option$(s)$ is(are)
$(A)$ $M \propto \sqrt{ c }$ $(B)$ $M \propto \sqrt{ G }$ $(C)$ $L \propto \sqrt{ h }$ $(D)$ $L \propto \sqrt{G}$
If dimensions of critical velocity $v_c$ of a liquid flowing through a tube are expressed as$ [\eta ^x \rho ^yr^z]$ where $\eta ,\rho $ and $r $ are the coefficient of viscosity of liquid, density of liquid and radius of the tube respectively, then the values of $x, y$ and $z$ are given by
In the relation $y = a\cos (\omega t - kx)$, the dimensional formula for $k$ is