I am an engineer building a new hair dryer. I have developed an efficient motor to move the air around, and filaments to heat the air as it passes through. However, when I test my hair dryer using different amounts of current, I find that the hair dryer overheats when current passes 13 amps. To ensure this is not dangerous for my customers, what should I install into my hair dryer? How does it work? Where would I install it?

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?