Answer:
U = 129.053 KJ/m².h
Explanation:
overall heat transfer coefficient (U):
U = (<em>m</em>Cp(ToutH2O - TinH2O))/[A((ToutAir - TinH2O)-(TinAir - ToutH2O))/(Ln(ToutAir - TinH2O)/(TinAir - ToutH2O))]
∴ A = 925 m²
H2O:
∴ mass flow H2O (<em>m</em>) = 45500 Kg/h
∴ Cp H2O = 4186 J/Kg°C
∴ Tin = 80°C
∴ Tout = 150°C
Air:
∴ Tin = 350°C
∴ Tout = 175°C
⇒ U = ((45500Kg/h)(4186J/Kg°C)(150-80))/(925m²)[((175-80)-(350-150))Ln((175-80)/(350-150))]
⇒ U = (1.333 E10 J/h)/(925m²)[(-150)Ln(0.475)]
⇒ U = 129052.73 J/m².h = 129.053 KJ/m².h
Answer:
D or A
<em>But I do know...</em>
It's because new strains of the virus are constantly appearing and evolving, so the vaccine must change along with them.
The formula is:
frequency * h (Planck's constant) = Energy
So, to find frequency you need just divide energy by the constant:
frequency = (8 * 10^-15 J) / (6.63 * 10^-34 J*s) = 1.2 * 10^19 1/s or 1.2 * 10^19 Hz
Answer:
which?........................
I am not exactly sure the answer that you are looking for, but I will guess on what you might be looking for. If the weight of an object is greater than the weight of the liquid it's being put into, the object will sink. Although, it isn't necessarily just based upon weight, it is more dependent on density to decide if it'll float or sink.
