An expansion valve does work on 100 g of water. The system is isolated, and all of
the work is used to convert the 90°C water into
water vapor at 110°C. How much work does the
expansion valve do on the water?

Known :

m = 100 gr = 0.1 kg

T1 = 90°C

T2 = 110°C

Solution :

Since the system is isolated, we can assume that no heat transfer is allowed, hence the process is adiabatic

W = m • Cv • ∆T

W = (0.1)(4.2 kJ/kg·K)(110°C - 90°C)

W = 8.4 kJ/kg

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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: