Three balls with the same radius 18 cm are in water. Ball 1 floats, with half of it exposed above the water level. Ball 2, with a density 842 kg/m^3 is held below the surface by a cord anchored to the bottom of the container, so that it is fully submerged. Ball 3, of density 1218 kg/m^3, is suspended from a rope so that it is fully submerged. Assume the density of water is 1000 kg/m^3 in this problem.
(a) Which is true for Ball 1?
MultipleChoice :
1) The magnitude of the buoyancy force is exactly one half of that of the ball's weight.
2) The magnitude of the buoyancy force is more than that of the ball's weight.
3) The magnitude of the buoyancy force is less than that of the ball's weight.
4) The magnitude of the buoyancy force is equal to that of the ball's weight.
(b) What is the tension on the rope holding the second ball, in newtons?
(c) What is the tension on the rope holding the third ball in N?