The pilot of an airplane reads the altitude 6400 m and the absolute pressure 46 kpa when flying over a city. calculate the local atmospheric pressure in that city in kpa and in mmhg. take the densities of air and mercury to be 0.828 kg/m3 and 13,600 kg/m3, respectively.
the local atmospheric pressure in the city in kpa is ?
the local atmospheric pressure in the city in mmhg is ?

Simon is writing a story about an astronaut whose spacecraft has been boarded by space pirates. the astronaut has her lucky penny in her hand behind her back as the space pirates break into the control room. she has just locked the controls so that the ship is accelerating in the direction of the control room’s ceiling. simon wants the astronaut to use the penny to hit a button on the control panel to turn off the lights and escape. the button is located a short distance behind and below the astronaut’s hands. how should simon use the theory of relativity to describe what the astronaut must do in order to hit the button?