Answer:
Magnetic materials have many spinning, unpaired electrons.
Explanation:
Any moving electric charge creates a magnetic field, also electrons since they spin and move around the nucleus. However, if two electrons are paired on the same orbital they always spin in opposite directions that causes their magnetic field to cancel out. Even if there are unpaired electrons in some atoms and these atoms act as small magnets, the magnetic field of the neighbouring atoms can have different directions and they also cancel out each other. Only presence of a large number of unpaired electrons in a material can create a significant magnetic field. This is the root part of the definition of magnetic properties of material.
 
        
             
        
        
        
Question: A cylinder is submerged in water as illustrated in the diagram. Which of the following statements is true?
Answer: The pressure at D is less than at B. 
Explanation: this is because B has less amount of pressure and D has a lot more pressure weighing it down and B has less pressure 
question answered by
(jacemorris04)
 
        
                    
             
        
        
        
(a) The electron kinetic energy is

which can be converted into Joule by keeping in mind that

So that we find

The kinetic energy of the electron is related to its momentum p by:

where m is the electron mass. Re-arranging the equation, we find

And now we can use De Broglie's relationship to find its wavelength:

where h is the Planck constant.
(b) By using the same procedure of part (a), we can convert the photon energy into Joules:

The energy of a photon is related to its frequency f by:

where h is the Planck constant. Re-arranging the equation, we find

And now we can use the relationship between frequency f, speed of light c and wavelength 

 of a photon, to find its wavelength:
 
 
        
        
        
Gravity on the surface of sun is given as

here we know that


now we will have


now we need to find the ratio of weight on surface of sun and on surface of Earth


so weight will increase by 28 times