Water flows at a rate of 0.25 kg/sec in a 2.5 cm diameter tube having a length of 3m. Constant heat flux is imposed at the tube wall so that the tube wall temperature is 40C higher than the water temperature. Calculate the heat transfer from the tube wall to the water. Thewater is pressurized so that boiling cannot occur. Assume a heat transfer coefficient of 3500W/m2C.

68.75W

Explanation:

Heat transfer is describe as the flow of thermal energy as a result of changes in temperature between two or more bodies. Heat  transferred via solid bodies is called conduction, and that associated with liquids and gases  is called convection, and likewise, the one attributed to electromagnetical waves  is called radiation.

heat transfer from the tube wall to the water = kA.ΔT

= 3500* π* (2.5 * 10⁻²)²/4 *40

= 68.75W

answer: cesare beccaria developed the classical school of criminology with from philosopher jeremy bentham

explanation:

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: