Q1) A stoppered test tube traps 25.0cm3 of air at a pressure of 1.00 atm and temperature of 18C. The cylindrically shaped stopper at the test tube's mouth has a diameter of 1.45 cm and will "pop off" the test tube if a net upward force of 7.50 N is applied to it. To what temperature would one have to heat the trapped air in order to "pop off" the stopper? Assume the air surrounding the test tube is always at a pressure of 1.00 atm.

Q2) An aluminum rod at 20 C has a length of 2.875 m. What will the length of the rod be if its temperature is raised to 50 C.

Q3)An air bubble at the bottom of a lake 29.0 m deep has a volume of 0.55 cm^3 . If the temperature at the bottom is 4C and the top 23 C, what is the volume of the bubble just before it reaches the surface.

Q4) the inside of home is separated from outside by a concrete wall that is 5m tall, 5 m wide, and 0.2 thick. If the temperature outside is 3 C at what rate is heat energy lost through the wall?