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3 years ago

Which of the following is an example of a physical change but not a chemical change?

Physics

2 answers:

vazorg [7]3 years ago

7 0

A water pipe freezes and cracks on a cold night. (D)

There are three physical changes going on in this scenario:

1). The air gets cold and dark at night.

2). The water in the pipe freezes and expands.

3). The pipe cracks.

There are no chemical changes in the description.

Radda [10]3 years ago

5 0

Answer:

A water pipe freezes and cracks on a cold night

Explanation:

A water pipe freezing and cracking is a physical change, not a chemical change. A physical change is a change in what the item looks like, feels like, or how the item has a different form. The water pipe freezing is an example of a physical change because the liquid water has turned to frozen water. The frozen water has expanded the pipe, causing it to crack. There are no chemical changes taking place in this scenario.

Mordancy.

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The Drag Force equation is:

$F_{D}=\frac{1}{2}C_{D}\rho A_{D}V^{2}$ (1)

Where:

$F_{D}$ is the Drag Force

$C_{D}$ is the Drag coefficient, which depends on the material

$\rho$ is the density of the fluid where the bicycle is moving (air in this case)

$A_{D}$ is the transversal area of the body or object

$V$ the bicycle's velocity

Now, if we assume $C_{D}$ , $\rho$ and $A_{D}$ do not change, we can rewrite (1) as:

$F_{D}=C.V^{2}$ (2)

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Equation (2) is written as:

$F_{D}=C.V_{n}^{2}=C.(2V)^{2}$

$F_{D}=4CV^{2}$ (4)

Comparing (2) and (4) we can conclude the Drag force is four times greater when the speed is doubled.

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