3. [1pt] For each statement, select the phrase that makes the statement true (e.
ID: 1998769 • Letter: 3
Question
3. [1pt]
For each statement, select the phrase that makes the statement true (e.g., if the answer to the first is A and to the others B, enter ABBBB):
A boat containing a large block of ice floats in a swimming pool. The water level in the pool ____ when the ice is dropped into the water.
Two balloons of the same volume are filled with helium and air, respectively. The buoyant force on the helium-filled balloon is ____ the buoyant force on the air-filled balloon.
Two identical shallow containers are placed on identical scales. A live duck is put in one container. Both containers are then filled with water to their brims; it is observed that the duck is standing on the bottom of its container. The reading on the scale under the container with the duck is ____ the reading on the other scale.
A block of wood is fully submerged in a pail of water and is held down by a spring connected to the bottom of the pail. The device is placed in an elevator and the length of the stretched spring is measured when the elevator is stationary. The spring's length ____ when the elevator accelerates downward.
A glass containing an ice cube is filled with enough water to float the ice cube. The water level in the glass ____ when the ice cube melts.
A) increases B) decreases C) less thanD) greater than E) stays the same F) the same as
Explanation / Answer
A boat containing a large block of ice floats in a swimming pool. The water level in the pool stays the same when the ice is dropped into the water.
Two balloons of the same volume are filled with helium and air, respectively. The buoyant force on the helium-filled balloon is the same as the buoyant force on the air-filled balloon.
Two identical shallow containers are placed on identical scales. A live duck is put in one container. Both containers are then filled with water to their brims; it is observed that the duck is standing on the bottom of its container. The reading on the scale under the container with the duck is greater than the reading on the other scale.
A block of wood is fully submerged in a pail of water and is held down by a spring connected to the bottom of the pail. The device is placed in an elevator and the length of the stretched spring is measured when the elevator is stationary. The spring's length stays the same when the elevator accelerates downward.
A glass containing an ice cube is filled with enough water to float the ice cube. The water level in the glass decreases when the ice cube melts.
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