Physics-
General
Easy

Question

Two identical mass m are connected to a massless string which is hung over two frictionless pulleys as shown in figure. If everything is at rest, what is the tension in the cord?

  1. less than mg    
  2. exactly mg    
  3. more than mg but less than 2mg    
  4. exactly 2mg    

The correct answer is: exactly mg

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Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio 35 percent sign M g C l subscript 2 end subscript plus 50 percent sign N a C l plus 15 percent sign C a C l subscript 2 end subscript times N a C l blank a n d blank C a C l subscript 2 end subscript are added to lower the fusion temperature and to increase the conductance.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript plus C a to the power of 2 plus end exponent
M g left parenthesis O H right parenthesis subscript 2 end subscript plus 2 H C l ⟶ M g C l subscript 2 end subscript plus 2 H subscript 2 end subscript O blank left parenthesis l i q u i d right parenthesis
Electrolysis of fused MgCl2 stack ⟶ with text  Anode  end text on top 2 C l to the power of minus end exponent ⟶ C l subscript 2 end subscript plus 2 subscript negative 1 end subscript e to the power of ring operator end exponent stack ⟶ with text  Cathode  end text on top M g to the power of 2 plus end exponent plus 2 subscript negative 1 end subscript e to the power of ring operator end exponent ⟶ M g
electrolysed is protected from atmospheric oxidation by a blanket of inert gases
In the hydrated chloride of Mg the value of of x is

Dow's process of extraction of Mg involves extraction of Mg from sea water. Sea water is concentrated in sun light and is then treated with slaked lime. Magnesium hydroxide is heated in a stream of HCl to give MgCl2 which is electrolysed to discharge Mg. The mixture is in the ratio 35 percent sign M g C l subscript 2 end subscript plus 50 percent sign N a C l plus 15 percent sign C a C l subscript 2 end subscript times N a C l blank a n d blank C a C l subscript 2 end subscript are added to lower the fusion temperature and to increase the conductance.
M g to the power of 2 plus end exponent plus C a left parenthesis O H right parenthesis subscript 2 end subscript ⟶ M g left parenthesis O H right parenthesis subscript 2 end subscript plus C a to the power of 2 plus end exponent
M g left parenthesis O H right parenthesis subscript 2 end subscript plus 2 H C l ⟶ M g C l subscript 2 end subscript plus 2 H subscript 2 end subscript O blank left parenthesis l i q u i d right parenthesis
Electrolysis of fused MgCl2 stack ⟶ with text  Anode  end text on top 2 C l to the power of minus end exponent ⟶ C l subscript 2 end subscript plus 2 subscript negative 1 end subscript e to the power of ring operator end exponent stack ⟶ with text  Cathode  end text on top M g to the power of 2 plus end exponent plus 2 subscript negative 1 end subscript e to the power of ring operator end exponent ⟶ M g
electrolysed is protected from atmospheric oxidation by a blanket of inert gases
In the hydrated chloride of Mg the value of of x is

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