An isolated system of total mass m is formed by mixing two equal masses of the same liquid initially at the temperatures t1 and t2. eventually, the system attains an equilibrium state. each mass is incompressible with constant specific heat c. find an expression of the amount of entropy produced in terms of m, c, t1 and t2.

The place you get your hair cut has two nearly parallel mirrors 6.00 m apart. as you sit in the chair, your head is 2.00 m from the nearer mirror. looking toward this mirror, you first see your face and then, farther away, the back of your head. (the mirrors need to be slightly nonparallel for you to be able to see the back of your head, but you can treat them as parallel in this problem.) how far away does the back of your head appear to be?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

According to an observer on earth, planet x is stationary. maria and samir depart earth on their spaceships at the same time, each flying at 0.5c. maria flies toward planet x and samir flies in the opposite direction. according to maria, her voyage to planet x takes 9 years. how many years does maria's voyage take according to samir?