Answer:
Explanation:
The turbine is modelled after the First Law of Thermodynamics:
The rate of heat transfer between the turbine and its surroundings is:
The specific enthalpies at inlet and outlet are, respectively:
The required output is:
![\dot Q_{out} = \left(8\,\frac{kg}{s} \right)\cdot \left\{3076.41\,\frac{kJ}{kg}-2675.0\,\frac{kJ}{kg}+\frac{1}{2}\cdot \left[\left(65\,\frac{m}{s} \right)^{2}-\left(42\,\frac{m}{s} \right)^{2}\right] + \left(9.807\,\frac{m}{s^{2}} \right)\cdot (4\,m) \right\} - 8000\,kW](https://tex.z-dn.net/?f=%5Cdot%20Q_%7Bout%7D%20%3D%20%5Cleft%288%5C%2C%5Cfrac%7Bkg%7D%7Bs%7D%20%5Cright%29%5Ccdot%20%5Cleft%5C%7B3076.41%5C%2C%5Cfrac%7BkJ%7D%7Bkg%7D-2675.0%5C%2C%5Cfrac%7BkJ%7D%7Bkg%7D%2B%5Cfrac%7B1%7D%7B2%7D%5Ccdot%20%5Cleft%5B%5Cleft%2865%5C%2C%5Cfrac%7Bm%7D%7Bs%7D%20%5Cright%29%5E%7B2%7D-%5Cleft%2842%5C%2C%5Cfrac%7Bm%7D%7Bs%7D%20%5Cright%29%5E%7B2%7D%5Cright%5D%20%2B%20%5Cleft%289.807%5C%2C%5Cfrac%7Bm%7D%7Bs%5E%7B2%7D%7D%20%5Cright%29%5Ccdot%20%284%5C%2Cm%29%20%5Cright%5C%7D%20-%208000%5C%2CkW)
Answer:
Q' = 8 KW.h
Q'=28800 KJ
Explanation:
Given that
Heat Q= 4 KW
time ,t = 2 hours
The amount of energy used in KWh given as
Q ' = Q x t
Q' = 4 x 2 KW.h
Q' = 8 KW.h
We know that
1 h = 60 min = 60 x 60 s = 3600 s
We know that W = 1 J/s
The amount of energy used in KJ given as
Q' = 8 x 3600 = 28800 KJ
Therefore
Q' = 8 KW.h
Q'=28800 KJ
Answer:
greater than 1
Explanation:
The mechanical advantage is the ratio Fr/Fe. So if Fr > Fe, the mechanical advantage is greater than 1.
Answer:
Best case = 2 gloves
Given Information:
Red gloves = 5 pairs
Yellow gloves = 4 pairs
Green gloves = 2 pairs
smallest number of gloves you need to select to have at least one matching pair in the best case = ?
Explanation:
How many gloves do you need to make one matching pair?
2
Yes, you are right. 2 gloves makes a matching pair and it is the smallest number of gloves you need to select to have at least one matching pair.
But what about worst case?
lets say
you tried all 5 red gloves either all of them were left or right
then you tried 4 yellow gloves either all of them were left or right
then you tried 2 green gloves either all of them were left or right
Now all the left or right gloves are tried (5 + 4 + 2 = 11) and the 12th one will definitely be either matching red, yellow or green.
Therefore, in the worst case scenario, the smallest number of gloves you need to select to have at least one matching pair is 12.
Answer:
Shut off cylinder valve before turning off forklift.
Explanation:
