Time and space are both relative
        
                    
             
        
        
        
One side of the wave changes speed before the other side, causing the wave to move
        
             
        
        
        
Answer:
a) 6.4 kJ
b) 43.4 kJ
Explanation:
a)
 = Heat absorbed = 37 kJ
 = Heat absorbed = 37 kJ
 = Coefficient of performance = 5.8
  = Coefficient of performance = 5.8
 = Work done
 = Work done 
Heat absorbed is given as 
 =
 =  
  
 
37 = (5.8)  
 
 = 6.4 kJ
 = 6.4 kJ
b)
 = work per cycle required
  = work per cycle required 
 =
  =  +
 +  
 
 = 37 + 6.4
  = 37 + 6.4 
 = 43.4 kJ
  = 43.4 kJ
 
        
             
        
        
        
Answer:
width of slit(a)≅ 0.1mm
Explanation:
Wave length of laser pointer =λ = 685 nm 
Distance between screen and slit = L = 5.5 m
Width of bright band = W=8.0cm=0.08m
width of slit=a
recall the formula;
W=(2λL)/a
a=2λL/W
a=(2 *685*10⁻⁹*5.5m)/0.08m
a=7535*10⁻⁹/0.08
a=94187.5 *10⁻⁹
a=0.0000941875m
a=0.0941875mm
a≅0.1mm