La prensa hidráulica de la figura está formada por dos tanques cilíndricos, de diámetros 40 y 10 cm, respectivamente, conectados por la parte inferior mediante un tubo. La prensa contiene dos líquidos inmiscibles, agua y aceite. Calcular la masa m que habría que poner sobre el émbolo de diámetro menor para que el sistema se encontrase en equilibrio tal y como se muestra en la figura. Suponer que la presión ejercida por las masas sobre la superficie superior de cada émbolo se distribuye uniformemente sobre ella.

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?