A student immersed 200 pennies (each having a mass of 3 9) in boiling water. After they reached thermal equilibrium, she quickly fished them out and
dropped them into 0.24 kg of water at 20°C in an insulated container of negligible mass. What was the final temperature of the coins? Pennies are
made of a metal alloy-mostly zinc with a specific heat capacity of 390 J/(kg .K). For water, C = 4.19 X 103 J/(kg .K).

Because air contracts as it cools, the air pressure inside a freezer is typically lower than on the outside. why do ice cubes inside a freezer tend to shrink over time? a. the ice dissolves oxygen from the air, forming a denser crystalline matrix.b. the ice reacts chemically with carbon dioxide in the air, forming gaseous carbon compounds.c. the ice melts, and then the liquid freezes as ice crystals on the bottom of the freezer.d. the ice sublimes, and then the water vapor deposits as ice crystals on the sides of the freezer.

Explain what happens at the saturation point when adding salt to water at room temperature.

What is the equation for electrical work?