An open vertical rectangular tank is provided with a circular hole of 3 𝑚 diameter on one of its vertical sides. This hole is closed by a disk of 3 𝑚 diameter that can rotate about the horizontal diameter. When the water level in the tank is 4 𝑚 above the centre of the disk, the torque required to maintain the disk in equilibrium will be nearly:
A. 39 kNm
B. 33 kNm
C. 28 kNm
D. 23 kNm
Answer:A
An open vertical rectangular tank is provided with a circular hole of 3 𝑚 diameter on one of its vertical sides. This hole is closed by a disk of 3 𝑚 diameter that can rotate about the horizontal diameter. When the water level in the tank is 4 𝑚 above the centre of the disk, the torque required to maintain the disk in equilibrium will be nearly:
A. 39 kNm B. 33 kNm C. 28 kNm D. 23 kNm