3. Discuss the situation that occurs when an object is immersed in a fluid that has the same density as the object. 4. (a) Explain how a submarine is caused to submerge and surface without the use of its propulsion propeller and fins. (b) Which has the greater density, (1) ice or water, (2) milk or cream? 5. A block of wood floats in a beaker of water. According to Archimedes' principle, the block experiences an upward buoyant force. If the beaker with the water and floating block were weighed, would the measured weight be less than the sum of the weights of the individual components? Explain