Why do transformers hum? Transformer noise is caused by a phenomenon which causes a piece of magnetic sheet steel to extend itself when magnetized. When the magnetization is taken away, it goes back to its original condition. This phenomenon is scientifically referred to as magnetostriction.
        
             
        
        
        
Answer:
(a) 
(b) 
(c) 
Explanation:
(a) According to Newton's second law, the acceleration of a body is directly proportional to the force exerted on it and inversely proportional to it's mass.

(b) According to Newton's third law, the force that the sled exerts on the girl is equal in magnitude but opposite in the direction of the force that the girl exerts on the sled:

(c) Using the kinematics equation:

For the girl, we have  and
 and  . So:
. So:

For the sled, we have  . So:
. So:

When they meet, the final positions are the same. So, equaling (1) and (2) and solving for t:

Now, we solve (1) for 

 
        
             
        
        
        
Answer:
2.41 L
Explanation:
We can solve the problem by using the ideal gas equation, which can be rewritten as:

where we have:
 (initial pressure is stp pressure)
 (initial pressure is stp pressure)
 is the initial volume
 is the initial volume
 is the initial temperature (stp temperature)
 is the initial temperature (stp temperature)
 is the final pressure
 is the final pressure
 is the final volume
 is the final volume
 is the final temperature
 is the final temperature
By substituting the numbers inside the formula and solving for V2, we find the final volume:

which corresponds to 2.41 L.
 
        
             
        
        
        
Answer:
meter
The SI unit of distance and displacement is the meter [m].
Explanation:
have advancedd
 
        
                    
             
        
        
        
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