Q1. A weather vane at first at rest has a moment of inertia of 0.111 kg • m2 about its axis of rotation. A 53.0 g piece of clay is thrown at the vane and sticks to it at a point 19.5 cm from the axis. The initial velocity of the clay is 20.0 m/s, directed vertical to the vane. Find out an angular velocity of the weather vane just after it is struck.
Q2. When solids are dissolved in a liquid solid take up the spaces between the liquid molecules (the macroscopic volume of the liquid basically stays the same). If I have 2 containers and I dissolve 50 grams of NaCl in one and 50 grams of LiCl in the other, that container would provide the aluminium block with a greater buoyancy force (assume both completely dissolve)?