In this prototype of a flashlight, a neodymium magnet (Y) is shaken back and forth through a circular copper coil (X), producing an electric current to operate the flashlight for several minutes at a time. What do the magnet and copper coil in this flashlight represent?

generator
motor
resistor
transformer

Very large accelerations can injure the body, especially if they last for a considerable length of time. one model used to gauge the likelihood of injury is the severity index ( ), defined as =/ . in the expression, is the duration of the accleration, but is not equal to the acceleration. rather, is a dimensionless constant that = the number of multiples of that the acceleration is equal to. in one set of studies of rear-end collisions, a person's velocity increases by 13.7 km/h with an acceleration of 36.0 m/s2 . let the + direction point in the direction the car is traveling. what is the severity index for the collision?

What are known as the properties of substances that describe a substance et does not change that substances?

2. which of the following does not affect the electrical resistance of a body? a. material composing the body b. bodies directly surrounding the body c. length of the body > d. temperature of the body