7. A block of volume 0.025m3 is allowed to sink in water as shown. A circular rod 5m long and 20 cm2 in cross section is attached to the weight and also to the wall. If the rod mass is 1.25 kg and the rod makes an angle of 12 degrees with the horizontal at equilibrium, what is the mass of the block M 5 m 10 = 12° V=0.025 m³ 0.25 m