A wagon is pulled at an angle of 30 degrees to the horizontal.
 
        
             
        
        
        
Answer:
Base-emitter and Base-collector junctions are forward biased
 
        
             
        
        
        
Answer:
no ... hahahha! but I know every boys wait for the day when their heart beat is faster than normal ever in life 
 
        
                    
             
        
        
        
The top pair of pliers failed to loosen a stubborn bolt, but the bottom pair successfully removed it. Because the contact between the bolt and the   pliers working surface is less.
<h3>What is mechanical advantage ?</h3>
Mechanical advantage is a measure of the ratio of output force to input force in a system, it is used to obtained efficiency of the given mechanical machine.
The efficiency to open the stubborn bolt depends upon the contact between the working surface of the pliers and the bolt.
The contact between the bolt and the top pair of pliers working surface is less. Its mechanical advantage is less.
Hence, the top pair of pliers failed to loosen a stubborn bolt, but the bottom pair successfully removed it.
To learn more about the mechanical advantage, refer to the link;
brainly.com/question/7638820
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