The area is the length times the height so A= bh ...?
        
             
        
        
        
Answer:
B. QC > 0; QH < 0
Explanation:
Given that there are two reservoir of energy.
Sign convention for heat and work :
1.If the heat is adding to the system then it is taken as positive and if heat is going out from the system then it is taken as negative.
2. If the work is done on the system then it is taken as negative and if the work is done by the system then it is taken as positive.
From hot reservoir heat is going out that is why it is taken as negative 

From cold reservoir heat is coming inside the reservoir that is why it is taken as positive

That is why the answer will be 
 ,
 ,
 
        
             
        
        
        
Step up transformer is a device which is used to step up the voltage which is input with some value.
This is based upon the principle of mutual inductance and in this the voltage input and voltage output is different because of number of turns.
Here if ideal transformer is given then power input and power output of the transformer must be same as there is no power loss in ideal transformer.
So we can write

here
 = 73.37 A
 = 73.37 A
 = 4623 V
 = 4623 V
 = 105033 A
 = 105033 A
now using above equation we will have

solving above we will have

 
        
             
        
        
        
Answer: 75 ft
Explanation:
Breaking distance = Speed²/ 20
= 30²/20
= 45 feet
Stopping distance = Speed + braking distance
= 30 + 45
= 75 ft
 
        
             
        
        
        
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