Dimensions of Physical Quantities and Dimensional Analysis
Dimensions of Physical Quantities and Dimensional Analysis: Overview
In this topic, we will understand how to write the dimensions of physical quantities. It highlights the dimensional formulae of some physical quantities in tabular form. It also mentions the uses of the dimensional equation to derive the dimensions.
Important Questions on Dimensions of Physical Quantities and Dimensional Analysis
The dimensions of are

The dimensions of are

The frequency of vibration of a mass suspended from a spring of spring constant is given by a relation of the type , where is a dimensionless constant. The values of and are:

According to Newton, the viscous force acting between liquid layers of area A and velocity gradient is given by , where is constant called coefficient of viscosity. The dimensional formula of is:

If and denote capacitance and resistance respectively, then the dimensional formula of is

Turpentine oil is flowing through a tube of length and radius r. The pressure difference between the two ends of the tube is p. The viscosity of oil is given by
Where is the velocity of oil at a distance from the axis of the tube. The dimensions of are:

P represents radiation pressure, c represents speed of light and S represents radiation energy striking unit area per sec. The non zero integers x, y, z such that is dimensionless are:

The dimensional formula of the constant in Vander Waal’s gas equation is:

The dimensional formula of the constant in Vander Waal’s gas equation is:

Pressure depends on distance as , where are constants is distance, is Boltzman's constants and is temperature. The dimension of are

The units of force and length are made three times of their earlier values. Earlier the energy of energy of the system was . What will be the energy of the same system in new units?

Planck's constant has the dimension of

Dimensions of 'ohm' are same as

If speed of light , acceleration due to gravity and pressure are taken as fundamental units, the dimensions of gravitational constant are

The speed of light , gravitational constant , and Planck's constant are taken as the fundamental units in a system. The dimension of time in this new system should be,

The pair(s) of physical quantities that have same dimension, is (are):

The dimensions of the quantities in one (or more) of the following pairs are the same. Identify the pair(s).

represent the physical quantities, inductance, capacitance and resistance, respectively. The combinations which have the dimensions of frequency are

Which of the following physical quantities have the same dimensions ?

Which of the following quantities has the S.I. unit ?
