Answer:
The transmitted intensity through all polarizers is 
Explanation:
  According to Malu's law the intensity of a polarized light having an initial intensity  is mathematically represented as
 is mathematically represented as
                
Now  considering the polarizer(The polarizing disk) the equation above becomes 
           
Where n is the number of polarizers
        Substituting   for the initial intensity 3 for the n and 20° for the angle of rotation
 for the initial intensity 3 for the n and 20° for the angle of rotation 
            
                
               
       
                          
 
        
             
        
        
        
Answer:
α = 0.0135 rad/s²
Explanation:
given,
t = 133 min = 133 x 60 = 7980 s
angular speed varies from 570 rpm to 1600 rpm
now,
570 rpm = 
               = 59.69 rad/s
1600 rpm =  = 
               = 167.6 rad/s
using equation of rotational motion
 ωf = ωi + αt    
167.6 = 59.7 + α x 7980
α  x 7980 = 107.9
α = 0.0135 rad/s²
 
        
             
        
        
        
Answer:
air resistance, gravitational force
 
        
             
        
        
        
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