You create a transformer by wrapping wire around an iron nail. the number of turns are: primary (500); secondary (2500). the primary voltage is 3.00 v. the secondary current is 200 ma. this is like examples #14 and #15 (pages 16 & 17) of chapter 21 notes. 13) calculate the secondary voltage (v). 14) calculate the primary current (a).

Which term best describes the phrase “something that happens”?

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?

Aspring is used to stop a 50-kg package which is moving down a 20º incline. the spring has a constant k = 30 kn/m and is held by cables so that it is initially compressed 50 mm. knowing that the velocity of the package is 2 m/s when it is 8 m from the spring and neglecting friction, determine the maximum additional deformation of the spring in bringing the package to rest.