The most probable reason why the magnets won't stick on the refrigerator is that the body of the refrigerator and the magnets have like poles. If both have negative or both have positive poles facing each other, they will repel. In principle, magnets are attracted to opposite poles and like poles repel. 
        
             
        
        
        
Answer:
The value is 
Explanation:
From the question we are told that   
   The the peak wavelength is  
  Generally according to the Wien's displacement law 
         
   
Here T is the approximate surface temperature of this star in K so 
         
   
=>    
Converting to Fahrenheit , 
      ![T = [400 - 273.15 ] * \frac{9}{5} + 32](https://tex.z-dn.net/?f=T%20%3D%20%5B400%20-%20273.15%20%5D%20%2A%20%5Cfrac%7B9%7D%7B5%7D%20%2B%2032)
=>  
 
        
             
        
        
        
Answer:
Suppose two objects of different masses are moving with different velocities in the same direction on a straght-line before collision. After collision, they stick together and move with common (the same) velocity