Answer:
 Double the current
Explanation:
The energy delivered by the heater is related to the current by the following relation:
E= 
let R * t = k ( ∴ R and t both are constant)
so E= k 
Now let:
E2= k I₂^2
E2= 4E
⇒ k I₂^2= 4* k 
Cancel same terms on both sides.
I₂^2= 4* 
taking square-root on both sides.
√I₂^2 = √4* I^2
⇒I₂= 2I
If we double the current the energy delivered each minute be 4E. 
 
        
             
        
        
        
Answer:
  x =  0.176 m
Explanation:
For this exercise we will take the condition of rotational equilibrium, where the reference system is located on the far left and the wire on the far right. We assume that counterclockwise turns are positive.
Let's use trigonometry to decompose the tension
       sin 60 =  / T
 / T
       T_{y} = T sin 60
        cos 60 = Tₓ / T
       Tₓ = T cos 60
we apply the equation
        ∑ τ = 0
        -W L / 2 - w x + T_{y} L = 0
  
the length of the bar is L = 6m
            -Mg 6/2 - m g x + T sin 60 6 = 0
              x = (6 T sin 60 - 3 M g) / mg
let's calculate
let's use the maximum tension that resists the cable T = 900 N
              x = (6 900 sin 60 - 3 200 9.8) / (700 9.8)
              x = (4676 - 5880) / 6860
              x = - 0.176 m
Therefore the block can be up to 0.176m to keep the system in balance.
 
        
             
        
        
        
Molecular Geometry  is the three-dimensional structure or arrangement of atoms in a molecule. 
        
             
        
        
        
Military personnel also use periscopes in some gun turrets and in armoured vehicles. More complex periscopes using prisms or advanced fibre optics instead of mirrors and providing magnification operate on submarines and in various fields of science
 
        
             
        
        
        
Answer:
White light is a combination of all colors in the color spectrum.
Explanation:
 It has all the colors of the rainbow. Combining primary colors of light like red, blue, and green creates secondary colors: yellow, cyan, and magenta