# Tutor profile: Anshal K.

## Questions

### Subject: Calculus

lim [e x -1] / x as x approaches 0 is equal to?

The definition of the derivative at x = a is given by f '(a) = lim [f(x) - f(a)] / (x - a) as x approaches a. For f(x) = e x, f ' (x) = e x The given limit is the derivative of e x at x = 0 which is e0 = 1

### Subject: Civil Engineering

List out the reinforcements that are used in the process of pre-stressing?

There are three primary types of reinforcements that are used in the pre-stressing process. They are: • Spalling Reinforcements. • Equilibrium Reinforcements. • Bursting Reinforcements.

### Subject: Physics

Why do objects float in liquids denser than themselves?

When an object is completely immersed in a liquid with greater density it will float as the resulting buoyant force exceeds the weight of the object. This can be explained as, when the object is immersed it displaces liquid. The weight of the displaced liquid is greater than the weight of the object (since the liquid is denser) therefore, as a result, the object cannot remain completely submerged and it floats. The scientific name for this phenomenon is Archimedes Principle.

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