What is the central idea of the second section:
What Happens When We Dream?
-REM sleep got its name because our eyelids
flutter during that stage of sleep.
-While dreaming, many changes take place in a
person's body and brain.
-Motoneurons that control the body's movement
stop working during REM.
-While people are dreaming, their brain thinks
that they are awake.

a solenoid is created by wrapping a l = 90 m long wire around a hollow tube of diameter d = 4.5 cm.   the wire diameter is d = 0.9 mm.   the solenoid wire is then connected to a power supply so that a current of i = 9 a flows through the wire.

randomized variablesl = 90 m

d = 4.5 cm

d = 0.9 mm

i = 9 a                                          

write an expression for the number of turns, n, in the solenoid. you do not need to take into account the diameter of the wire in this calculation.

calculate the number of turns, n, in the solenoid.

write an expression for the length of the solenoid (l2) in terms of the diameter of the hollow tube d.

calculate the length of the solenoid (l2)   in meters.

calculate the magnitude of the magnetic field at the center of the solenoid in teslas.

explanation:

d) elnora cannot convince wesley sinton to her with school costs. she will raise the money herself.