Answer:
For most uses you'll want your water heated to 120 F(49 C) In this example you'd need a demand water heater that produces a temperature rise and it will take about 2 hours
Answer:
Explanation:
Total Stopping distance is the sum of the reaction distance and the braking distance, such that ;
d=dr + db =1.47St +[ ( Si 2- Sf2 ) / 30(F/0.01G) ]
In this case, the reaction time, t, is the AASHTO standard, or 2. 5 s. The friction factor, F, is based upon the standard AASHTO deceleration rate of 11.2 ft/s2 (F = 11.2/32.2 = 0.348) and the speed is given as 40 mph.
d = 1.47x60x2.5+ [ (60^2-40^2) / 30x 0.348 ]
d = 220.5 + ( (3600-1600) / 10.44 )
d = 220.5 + 191.57
d = 412.07ft.
Since the sign can be seen clearly at 120 ft.
Then the position of the sign should be,
= 412.07 - 120
= 292.07 ft
To develop the problem it is necessary to apply the concepts related to the ideal gas law, mass flow rate and total enthalpy.
The gas ideal law is given as,

Where,
P = Pressure
V = Volume
m = mass
R = Gas Constant
T = Temperature
Our data are given by




Note that the pressure to 38°C is 0.06626 bar
PART A) Using the ideal gas equation to calculate the mass flow,




Therfore the mass flow rate at which water condenses, then

Re-arrange to find 



PART B) Enthalpy is given by definition as,

Where,
= Enthalpy of dry air
= Enthalpy of water vapor
Replacing with our values we have that



In the conversion system 1 ton is equal to 210kJ / min


The cooling requeriment in tons of cooling is 437.2.