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A wooden block of mass 1 kg and density 800 kg m - 3 is held stationary, with the help of a string, in a container filled with water of density 1000 kg m - 3, as shown in the figure. If the container is moved upwards with an acceleration of 2 m s - 2 , then the tension in the string will be ( take g = 10 m s - 2 )

Options

  1. A2   N
  2. B3 N
  3. C5   N
  4. D6   N

Correct answer

B. 3 N

Step-by-step solution

W ′ = m ( g + a ) = 1 × 12 = 12 N B ′ = ρ l × v × ( g + a ) = 1000 × 1 800 × ( 12 ) = 15 N ∴ T = B ′ – W ′ = 15 – 12 = 3 N

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