# Physics Chapter 14

Total word count: 755
Pages: 3

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 Atmospheric pressure decreases with increasing _______. altitude A column of mercury 76 cm tall has a weight that is equal to _______. that of a column of water 10.3 meters tall When a party balloon is compressed to one-third its volume, gas pressure in the balloon _______. triples A 1-kg balloon at equilibrium in the air is buoyed up with a force of _______. 10 newtons A helium-filled balloon will reach its maximum altitude when _______. its weight equals the weight of displaced air When the speed of a fluid increases, internal pressure in the fluid _______. decreases The air in this room has all of these: mass, energy, weight. Airplane flight best illustrates Bernoulli’s principle. The main difference between gases and plasmas has to do with electrical conduction. Most of the matter in the universe is in the plasma state. The faster a fluid moves, the less its internal pressure. Suspend a pair of Ping-Pong balls from two strings so there is a small space between them. If you blow air between the balls, they will swing toward each other. Which of the following bodies is comprised mostly of plasma? Sun A one-ton blimp hovers in the air. The buoyant force acting on it is one ton. When gas in a container is squeezed to half its volume and the temperature remains the same, the gas pressure doubles. In a vacuum, an object has no buoyant force. Atmospheric molecules do not fly off into outer space because of Earth gravitation. In drinking soda or water through a straw, we make use of atmospheric pressure. In a vacuum a marshmallow becomes larger. About how high can water be theoretically lifted by a vacuum pump at sea level? 10.3 m Compared to the buoyant force of the atmosphere on a 1-liter helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-liter solid iron block is the same. A bubble of air released from the bottom of a lake becomes larger as it rises. The flight of a blimp best illustrates the principle of Archimedes. A suction cup sticks to a wall. It is pushed to the wall by the atmosphere. When gas in a container is squeezed to half its volume, its density doubles. A balloon is buoyed up with a force equal to the weight of air it displaces. As a helium-filled balloon rises in the air, it becomes bigger. Alcohol is less dense than water. If alcohol is used to make a barometer on a day when atmospheric pressure is normal, the height of the alcohol column would be more than 10.3 m. Compared to the buoyant force of the atmosphere on a 1-kilogram helium-filled balloon, the buoyant force of the atmosphere on a nearby 1-kilogram solid iron block is considerably less. The energy source responsible for the motion of molecules that make up the atmosphere is solar power. It would be easier to pull evacuated Magdeburg hemispheres apart when they are 20 km above the ocean surface. What change in pressure occurs in a party balloon that is squeezed to one-third its volume with no change in temperature? The pressure will increase to three times its original pressure. A plasma differs from a gas in that it is electrically conducting. A large block of wood and a smaller block of iron on weighing scales both register the same weight – 1 ton. Taking buoyancy of air into account, which has the greater mass? wood Suppose you are standing on a weighing scale and all of a sudden the atmosphere vanished. The reading on the scale would increase. The weight of a 1-square-meter column of air that extends from sea level to the top of the atmosphere is 101,000 N. A helium-filled balloon released in the atmosphere will rise until the balloon and surrounding air have equal densities. Consider two mercury barometers, one with twice the cross-sectional area of the other. Neglecting capillarity, mercury in the smaller tube will rise the same height as in the larger tube. A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of water in it, the height of the water column would be 10.3 meters. A column that extends from sea level to the top of the atmosphere contains a certain mass of air. If the same column instead had the same mass of mercury in it, the height of the mercury column would be about 3/4 meter. Compared to all liquids, solids, and gases in the universe, plasmas are the most abundant.

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