# Tutor profile: Sourabh A.

## Questions

### Subject: Chemistry

What is coagulation and how does it work in solutions?

Coagulation is the process (usually in colloids) in which oppositely charged ions (relative to the charge present in the solution) combine with the charges present in the solution to form a heavy cluster of particles resulting in the settling of the particles in the solution.

### Subject: Calculus

If a function is continuous at x=a, what can you comment about its derivative at x=a?

If a function is continuous at x=a, we cannot comment on its derivative at x=a as the information provided is insufficient. But if the derivative of the function exists at x=a, then we can surely say that the function is continuous at x=a.

### Subject: Physics

If the resultant torque of all the forces acting on a body is zero about a point, is it necessary that it will be zero at any other point as well?

Yes, the resultant torque of all forces about any other point will also be zero. All the pseudo forces have to be taken into consideration as well. Torque is a function of the distance of Forces from the point of consideration and the Forces (All including pseudo-forces) being applied to the body.

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