Answer:
B
Explanation:
The Bush administration had prided itself on its unique focus for homeland security and combating terrorism, without adequate preparation for the disaster.
 
        
             
        
        
        
Answer:
 Percentage change 5.75 %.
Explanation:Given ;
Given 
  Pressure of condenser =0.0738 bar
 Surface temperature=20°C
Now from steam table 
 Properties of steam at 0.0738 bar  
Saturation temperature corresponding to saturation pressure =40°C      
  
 
So Δh=2573.5-167.5=2406 KJ/kg
Enthalpy of condensation=2406 KJ/kg
So total heat=Sensible heat of liquid+Enthalpy of condensation

Total heat =4.2(40-20)+2406
Total heat=2,544 KJ/kg
Now film coefficient before inclusion of sensible heat
   
   

Now film coefficient after inclusion of sensible heat
  
  

 
 
               
 
                    =5.75 %
So Percentage change 5.75 %.
 
        
             
        
        
        
Answer:
  = -0.303 KW
= -0.303 KW
Explanation:
This is the case of unsteady flow process because properties are changing with time.
From first law of thermodynamics for unsteady flow process
 
Given that tank is insulated so and no mass is leaving so
 and no mass is leaving so
 
 

 
 
Mass conservation 
 is the initial and final mass in the system respectively.
 is the initial and final mass in the system respectively.
Initially tank is evacuated so 
We know that for air  ,
,

So now putting values 

 = -0.303 KW
= -0.303 KW
 
        
             
        
        
        
Answer:
the branch of science and technology concerned with the design, building, and use of engines, machines, and structures. Anything that involves engines, wires, etc. basically