1. 2. 3. 4. 5. You walk slowly into a lake until the water is above your head an

Question

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You walk slowly into a lake until the water is above your head and you are floating. Which statement is correct? There is no buoyancy force on you until you start to float. The buoyancy force increases as you walk into the lake and is proportional to the weight of your body below the water level. The buoyancy force increases as you walk into the lake and is proportional to the volume of your body that is below the level of the water. The buoyancy force on you is constant and proportional to your total volume. A block is placed in a tank of water and floats as shown. The water level rises from the initial level by a height Delta h1. The block is then taken out and a block of the same weight but smaller volume that also floats is placed in the tank. The rise in the height of the water for the second block, Delta h2, relative to that for the first block, Delta h1, is: Delta h2 > Delta h1 Delta h2 = Delta h1 Delta h2

Explanation / Answer

1) C Bouyant force keeps in increasing as more an more volume of body is imersed.

2) C (height increse in water level depends on volume displaced and not weight)

3) C ( weight of water displace is same)

4) A ( Since the weight of the volume of hot water displaced is less than volume of cold water.lower the weight lower the bouyant force)

5) D) ( weight of boby and bouyant force are reduced by 1/3 but the ratio between the two is not changed)

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