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) increases B) decreases C) less than
D) greater than E) stays the same F) the same as
A boat containing a cement block floats in a swimming pool. The water level in the pool ______ when the cement block is thrown to the shore.
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.
A boat containing a cement block floats in a swimming pool. The water level in the pool ______ when the cement block is dropped into the water.
A block of wood floats in a pail of water in a stationary elevator. The level of water in the pail ______ when the elevator accelerates upward.
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.
The Attempt at a Solution
My guess was AFBAA
I am guessing my error is somewhere in the last two.
- I figured when a bucket was in an elevator accelerating upwards, the gravatational force would be pushing down on the object in the water forcing the water level to raise
-For the last one, my assumption was that the combined volume of the duck and the water would make it heavier compared to the one without a duck.
Any help please? Are my first 3 correct?