Two experiments are performed.
in (a), an 18.0 n force pushes horizontally on a 2.00 kg block that then pushes on a 4.00 kg block.
in (b), an 18.0 n force pushes on a 4.00 kg block that then pushes on a 2.00 kg block.
which statement is correct?

Which changes of state do the labels represent? a: b: c:

When is a current produced? when the terminals of an electrochemical cell are connected by a wire if the electric circuit is opened in an electrochemical cell if the electrolyte is removed from an electrochemical cell when the electrodes are reversed in an electrochemical cell

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?