Three liquids are at temperatures of 6 ◦C, 20◦C, and 40◦C, respectively. Equal masses of the first two liquids are mixed, and the equilibrium temperature is 12◦C. Equal masses of the second and third are then mixed, and the equilibrium temperature is 34.5 ◦C. Find the equilibrium temperature when equal masses of the first and third are mixed. Answer in units of ◦C.

Acharge q experiences no net force at a particular point in space. which of the following situations described below must always be true? -there are no other charges nearby. -if there are other charges nearby, they must all have the same sign as q. -if there are other charges nearby, they must all have the opposite sign of q. -if there are other charges nearby, the total positive charge must equal the total negative charge. -none of the above