Read this excerpt from Susan Butcher and the Iditarod Trail. Meanwhile “Wild Bill” faced a number of problems. The temperature had dropped to fifty degrees below zero. Speed was important, but he could not push his team too hard. The dogs' lungs might frost from breathing heavily in the Arctic air. To protect his own lungs, Bill breathed only through his nose. The bitter wind howled and hurled snow in his face. The trail was a blur.

What is the best inference a reader could make from this excerpt?

The only choice Bill had was to move as quickly as possible.
Bill did not understand how to handle the cold Arctic weather.
Moving too quickly could cause Bill and his dogs to become ill or die.
Bill could not see the trail because of how quickly his team was moving.

tree and the cat in the tree

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: