A metal block of base area 0.2 m2 is connected to a 0.02 kg mass via a string that passes over an ideal pulley as shown in figure. A liquid film of thickness 0.6 mm is placed between the block and the table. When released the block moves to the right with a constant speed of 0.17 m/s. The co-efficient of viscosity of the liquid is :

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answer is 2.

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Detailed Solution

T=FVmg=η A dVdx0.02 × 9.8 = η 0.2 × 0.17 − 00.6 × 10−3η = 3.45 × 10−3 Pa−S

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