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A tank accelerates upwards with acceleration a =1 m/s² contains water. A block of mass 1 kg and density 0.8 g/cm3 is held stationary inside the tank with the help of the string as shown in figure. The tension in the string is:
(Given: density of water = 1000 kg/m³)

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T=2.75 N

T=3 N

T=2.4 N

T=2.2 N

answer is B.

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Detailed Solution

$\begin{array}{l} F = upthrust force = {Vρ}_{w} (g + a) \\ = (\frac{Mass of block}{density of block}) ρ_{w} (g + a) \\ = \frac{1}{800} (1000) (11) = 13 .75 N \end{array}$
F - T - W = ma ; 13.75 - T - 10 = 1(1)
T = 2.75 N

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