Suppose that a wing component on an aircraft is fabricated from an aluminum alloy that has a plane strain fracture toughness of 40 mpa m. it has been determined that fracture results at a stress of 365 mpa when the maximum internal crack length is 2.5 mm. for this same component and alloy, compute the stress level at which fracture will occur for a critical internal crack length of 4.0 mm. 90 mpa

What happens to atoms and chemical bonds during a reaction?

Which notation is used to represent an alpha particle? a. b. c. d.

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?