# Physical science

Hello!

1.How can the density of a hollow lead ball filled with water be increased?
a.Increase the size of the ball and add more water.*
b.Remove the water and replace it with air.
c.Remove the water and melt the ball into a solid sphere.
d.Remove the water and replace it with oil.

2.
How does one reduce the density of water?
a.Waters density cannot be changed.
b.Boil liquid water.*
c.Melt frozen water (ice).
d.Freeze liquid water.

3.
How can one predict whether an object will float or sink in a liquid?
a.If an object is more dense than the liquid, it will sink.*
b.If the liquid is more transparent than the object, the object will sink.
c.If the liquid is more dense than the object, the object will sink.
d.If an object is less dense than the liquid, it will sink.

4.
If the weight of a submerged object is equal to the buoyant force, what net force acts upon the object?
a.upward
b.downward
c.sideways
d.none*

5.
Use the diagram to answer the question .
How is the buoyant force related to the displaced liquid in container A in the diagram above?
a.The mass of the displaced liquid equals the buoyant force on the block.
b.The weight of the displaced liquid is greater than the buoyant force on the block.
c.The mass of the displaced liquid equals the mass of the block.
d.The weight of the displaced liquid equals the buoyant force on the block.*

6.
In order for a ship to stay afloat, its buoyant force must be _____.

a.less than the shipâ€™s weight
b.equal to or greater than the shipâ€™s weight*
c.less than the forward force of the ship
d.equal to or greater than the forward force of the ship

7.
Use the diagram to answer the question .

How does the weight of the block in container A compare to the weight of the block in container B in the diagram above?
a.It is more than the weight of the block in container B.
b.It is less than the weight of the block in container B.*
c.It cannot be determined from the picture.
d.It is the same as the weight of the block in container B.

8.
If an object floats, what is the volume of displaced water equal to?

a.the volume of the portion of the object that is above water
b.the volume of the entire object*
c.the volume of the portion of the object that is submerged
d.the volume of exactly half of the object

9.
When water fills a submarineâ€™s flotation tanks, what happens to the submarine?

a.Its overall density increases.*
b.The buoyant force is reduced.
c.Its overall density decreases.
d.Its overall density stays the same.

10.
If one cubic centimeter of lead has a mass of 11.3 grams, what is its density?

a.11.3 cm 3 /g
b.11.3 N
c.11.3 g/cm 3*
d.11.3 cm/g 3

^5&7^The photo/diagram is on "Country Blumpkin 33" account on Google Plus

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2. 👎
3. 👁
1. 1,2 incorrect; 5,7 I have no idea of the diagrams.
8 has no correct answer. The right answer is the weight of volume of the displaced water is equal to the weight of the ship.

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bobpursley

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