Along, straight solenoid with a cross-sectional area of 8.00cm2 is wound with 90turns of wire per centimeter, and the windings carry a current of 0.350a. a second winding of 12 turns encircles the solenoid at its center. the current in the solenoid is turned off such that the magnetic field of the solenoid becomes zero in 0.0400s.
what is the average induced emf in the second winding? give your answer in volts in scientific notation to three significant digits.

What was the first instrument to ever record an earthquake?

The frequency of the fundamental of the guitar string is 320 hz. at what speed v do waves move along that string?

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?