350kg because to get Newton’s it’s mass x Gravity, earths gravity is x10 so 3500 divided by 10 is 350
        
             
        
        
        
Answer:
I know the first one is C.) 4J. I don't know of the answer for the second oneis suppose to be in N/m form? but I got
2,500N/m
 
        
             
        
        
        
We need to charge a metal sphere positively without touching it. This can be achieved using electrostatic induction.
        
             
        
        
        
Answer:
the reason for the acceleration month that the coefficient of kinetic friction is less than the coefficient of satic frictionExplanation:
This exercise uses Newton's second law with the condition that the acceleration is zero, by the time the body begins to slide. At this point the balance of forces is
     fr- w || = 0
 The expression for friction force is that it is proportional to the coefficient of friction by normal.
     fr = μ N
When the system is immobile, the coefficient of friction is called static coefficient and has a value, this is due to the union between  the surface, when the movement begins some joints are broken giving rise to coefficient of kinetic friction less than static.  
In consequence a lower friction force, which is why the system comes out of balance and begins to accelerate.
       μ kinetic <μ static
   In all this movement the normal with changed that the angle of the table remains fixed.
Consequently, the reason for the acceleration month that the coefficient of kinetic friction is less than the coefficient of satic friction