Part A This problem involves two different states of the same quantity of gas (the air inside the bubble): the initial state when the bubble is at the bottom of the lake, and the final state when the bubble reaches the surface. What are the initial pressure p1 and final pressure p2 of the air

Consider an ordinary, helium-filled party balloon with a volume of 2.2 ft3. the lifting force on the balloon due to the outside air is the net resultant of the pressure distribution exerted on the exterior surface of the balloon. using this fact, we can derive archimedes’ principle, namely that the upward force on the balloon is equal to the weight of the air displaced by the balloon. assuming that the balloon is at sea level, where the air density is 0.002377 slug/ft3, calculate the maximum weight that can be lifted by the balloon. note: the molecular weight of air is 28.8 and that of helium is 4.

Another word for electromagnetic energy is a. heat b. force c. matter d. radiation

What are the dimensions of the cross section that passes through the points a, f, g, and d?