The dimensions of Planck's constant is

The dimensions of k in the equation F = - k x (where F is force and x is displacement)

Write the dimensions of a × b in the relation E=b−x2at, where E is the energy, x is the displacement and t is time.

In the ideal gas equation PV=nRT, dimensional formula of R is

What is the dimensional formula of angular momentum L ? L=r p sinθ, where r is the position and P is momentum.

Which of the following have dimensions of [M L2 T−2 K−1] ?