Mary Lou is running errands for her mother. She leaves her house and goes 1 mile north to the bakery. She then goes 2.5 miles south to get her hair cut. She continues south for 1.5 miles to check out a book from the library. She then goes 0.75 miles north to meet a friend. This entire voyage lasts 3 hours.

if the thermos has a vacuum innner, then heat through conv currents and conduction are reduced = vacuum flask

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:

the answer is a 3.8cm

explanation: