# Tutor profile: Muhammad M.

## Questions

### Subject: Physics (Thermodynamics)

Why entropy decreases with increase in temperature?

dS=dQ/T Entropy is inversely proportional to temperature so as temperature increase, entropy decreases.

### Subject: Mechanical Engineering

Two balls of equal mass and of perfectly elastic material are lying on the floor. One of the ball with velocity v is made to struck the second ball. Both the balls after impact will move with a velocity?

A. v B. v/2 C. v/4 D. v/8 Answer: Option B

### Subject: Algebra

For what value of the constant K does the equation K x2 + 2x = 1 have two real solutions?

Rewrite the given quadratic equation in standard form: Kx 2 + 2x - 1 = 0 Discriminant = 4 - 4(K)(-1) = 4 + 4K For the equation to have two real solutions, the discriminant has to be positive. Hence we need to solve the inequality 4 + 4K > 0. The solution set to the above inequality is given by: K > -1 for which the given equation has two real solutions.

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