Ashaft of carbon steel (aisi 1010) with a diameter of 0.1 m is heated in a gas furnace at 1200 k. the convection heat transfer coefficient is 100 w/m2. if the initial shaft temperature when entering the furnace is 300 k
a. how much time does it take for the center of the shaft to have a temperature of 800 k?
b. at the time of the answer (a) what is the difference in surface temperature and center of the axis?

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:

6/12=1/2

step-by-step explanation: