Although gas station owners lock their tanks at night, a gas station owner was the victim of theft because his employee had a key to the tank. The owner of the gas station wants to bury the gasoline so deep that no vacuum pump will be able to extract it. He has hired a general contractor to dig the holes for the tanks. What is the minimum gasoline surface depth h2 needed to prevent siphoning by any pump? Assume the specific gravity of gasoline is 0.744 and that the tank is not sealed. (You can ignore the drop rate of the gasoline level inside of the tank.) h2 = ft The gas station owner balks at the contractor's estimate. He neither has the funds nor approval from the city to dig that deeply. However, the contractor tels him that the best a thief could hope to have at his disposal is a 212-mbar vacuum pump. Anything better would be enormously expensive. Given this information, how deep h2 would the gasoline have to sit below the surface to keep it safe from thieves? h2 =

The human brain and spinal cord are immersed in the cerebrospinal fluid. The fluid is normally continuous between the cranial and spinal cavities and exerts a pressure of 100 to 200 mm of H2O above the prevailing atmospheric pressure. In medical work, pressures are often measured in units of mm of H2O because body fluids, including the cerebrospinal fluid, typically have nearly the same density as water. The pressure of the cerebrospinal fluid can be measured by means of a spinal tap. A hollow tube is inserted into the spinal column, and the height to which the fluid rises is observed, as shown in Figure P9.83. If the fluid rises to a height of 160. mm, we write its gauge pressure as 160. mm H2O. (a) Express this pressure in pascals, in atmospheres, and in millimeters of mercury. (b) Sometimes it is necessary to determine whether an accident victim has suffered a crushed vertebra that is blocking the flow of cerebrospinal fluid in the spinal column. In other cases, a physician may…

A window on a plane has a radius of  0.33 m. The plane crashes at  a depth that the water pressure is 4.33 × 105 Pa, and the aeroplanes air is at atmospheric pressure 1.01   105 Pa. What force is surrounding the window  keep it in place in newtons?

A container with water is pressurized and attached to a hose. The pressure inside the container, P, is set so that when the end of the tube is 4.5 meters above the water level in the container is ejected at 3.5 m/s. The reservoir in the container is large enough that you can ignore the change in height of the water in the container. What is the pressure P in atmospheres?