What is the challenge willy face in expert from stone fox

Since the excerpt was not mentioned in your question, I can try to answer you in a general way.  “Stone Fox” is a short novel published in 1980 by John Reynolds Gardiner. The story is about a little boy named Willy who enters a dog sled race in order to win $500 to pay back the taxes on his grandfather's farm. The book is about determination, courage and never giving up. Willy faces several challenges and obstacles that a child his age shouldn’t have to experience but he still believes he can win the race anyway and he won’t give up until he gets that prize.

can you copy and paste what selections you read? the answer is based off of that.

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: