(shell and tube heat exchanger) water flowing at a rate of 3.8 kg/s is heated from 38°c to 55°c in the tubes of a shell-and-tube heat exchanger. the shell side is one-pass with water, flowing at 1.9 kg/s, entering at 94°c. the overall heat transfer coefficient is 1420 w/(m2*k). the average water velocity in the tubes (1.905 cm inner diameter with a wall thickness of 0.5 cm) is 0.366 m/s. because of space limitations, the tubes may not exceed 2.44 m in length. determine the required number of tube passes, the number of tubes per pass, and the length of tubes consistent with this restriction.

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:

answer;

d. are made mostly of liquid

explanation;

-the general   composition and structure planets includes; they have a thick gas and liquid layer covering a small,solid core. mostly the gases are hydrogen and helium atmosphere and layers of liquid hydrogen. for instance neptune and uranus are examples of the outer planets, they have a core covered by ice and ammonia.

-neptune's atmosphere is hydrogen and helium with a bit of methane so there is no oxygen to breath and the interior is made up of frozen water and ammonia with a rock and iron core. thus, there is no liquid water or solid surface to survive.