Answer:
a
  Solid Wire      
      
   Stranded  Wire  
b
   Solid Wire    
 
    Stranded  Wire   
 
Explanation:
Considering the first question 
From the question we are told that 
   The  radius of the first wire is  
   The radius of  each strand is  
   The current density in both wires is  
Considering the first wire 
      The  cross-sectional area of the first wire is 
       
= >   
 
= >   
 
Generally the current in the first wire is    
      
=>  
=>   
 
Considering the second wire  wire 
The  cross-sectional area of the second wire is 
      
=>     
=>  
Generally the current is   
       
=>    
=>    
Considering question two  
  From the question we are told that 
      Resistivity is  
      The  length of each wire  is  
Generally the resistance of the first wire is mathematically represented as 
      
 
=>  
 
=>  
 
Generally the resistance of the first wire is mathematically represented as 
      
 
=>  
 
=>  
 
 
        
             
        
        
        
Answer: Leandra puts on her mittens because if you do not you will burn your self, due to extremely high temperatures. 
Explanation:
 
        
             
        
        
        
The answer is ultraviolet rays
        
             
        
        
        
Answer:
The time taken by the projectile to hit the ground is 6.85 sec.
Explanation:
Given that,
Vertical height of cliff = 230 m
Distance = 300 m
Suppose, determine the time taken by the projectile to hit the ground.
We need to calculate the time
Using second equation of motion

Where, s = vertical height of cliff
u = initial vertical velocity
g = acceleration due to gravity
Put the value in the equation



Hence, The time taken by the projectile to hit the ground is 6.85 sec.