Mass, wight, volume, and density

Which of the following statement is correct?

• the mass of an object can be measured with a spring balance

• the mass of an object can be measured with a beam balance

• the mass of the object does not change with location

• the weight of an object can never change

Objects that float on water are

• less dense than water

• denser than water

• just as dense as weater

• the same density with water

In the equation D=M/V, what does the V stand for

• volume

• variable

• velocity

• viscosity

A measure of how much matter is present in a substance

• weight

• mass

• volume

• density

A sample of 2 grams of iron will have a greater density than a sample of 1 gram of iron.

• true

• false

Two items of the same size will always have the same density.

• true

• false

A marble with a mass of 6 grams is dropped into a graduated cylinder with 30 mL of water. The water level rises to 32mL. What is the marble's density?

• 3 grams per centimeter cubed

• 2 grams per centimeter cubed

• 5 grams per centimeter cubed

• 6 grams per centimeter cubed

Only solids, not liquids, can sink or float in water.

• true

• false

A life jacket floats in water. What do you know about the life jacket?

• It is more dense than water.

• it is have same density with water

• It is just as dense as water.

• It is less dense than water.

A substance has a density of 2.0 g/mL. When you stop it in water, it will

• sink

• float

• sink at first but then float

• float at first but then sink