Explanation:
1200 is your answer for this question
 
        
             
        
        
        
Answer:
  KE = 1.75 J
Explanation:
given,
mass of ball, m₁ = 300 g = 0.3 Kg
mass of ball 2, m₂ = 600 g = 0.6 Kg
length of the rod = 40 cm = 0.4 m
Angular speed = 100 rpm= 
                          =10.47\ rad/s
now, finding the position of center of mass of the system
     r₁ + r₂ = 0.4 m.....(1)
  equating momentum about center of mass
   m₁r₁ = m₂ r₂
    0.3 x r₁ = 0.6 r₂
    r₁ = 2 r₂
Putting value in equation 1
 2 r₂ + r₂ = 0.4
  r₂ = 0.4/3
  r₁ = 0.8/3
now, calculation of rotational energy




  KE = 1.75 J
the rotational kinetic energy is equal to 1.75 J
 
        
             
        
        
        
The resistance of a given conductor depends on its electrical resistivity ( ), its length(L) and its cross-sectional area (A), as follows:
), its length(L) and its cross-sectional area (A), as follows:

In this case, we have  ,
,  and
 and  . So, the total resistance of the wire with length of 138m is:
. So, the total resistance of the wire with length of 138m is:

 
        
             
        
        
        
Phonograph. Hope that helps