Identities #!#How to find unknown coefficients

State the unknowns and coefficient of -7pq.

How to find the sum of all coefficients in the binomial expansion.

With the help of circuit diagram, explain how a meter bridge can be used to find unknown resistance of a given wire?

Discuss the experimental demonstration of the formation of beats. How can we find the unknown frequency of a fork (i) by loading with wax (ii) by filing fork ?

In a one-dimensional collision between two identical particles. A and B, B is stationary and A has momentum p before impact. During impact, B gives an impulse J to A. Find the coefficient of restitution between A and B?

How do you use the phenomenon of beats for determination of unknown frequencies ?

Find the magnitudes of the unknown forces if the sum of all forces is zero (figure)

Inequality method to decide monotonic behaviour || Questions to find unknown quantity

A body takes 1(1)/(3) times as much time to slide down a rough inclined plane as it takes to slide down an identical but smooth inclined plane,If the angle of inclination is 45^(@) find the coefficient of friction.