When 100 g of 20°C water is mixed with 50 g of 50°C water in a closed system, what is the final water temperature?

A 20°C

B) 30°C

C) 35°C

D50°C

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3

the answer is symmetrical : )