- #1

Leo Liu

- 353

- 156

- Homework Statement
- .

- Relevant Equations
- .

Could someone explain the green highlight to me, please?

You are using an out of date browser. It may not display this or other websites correctly.

You should upgrade or use an alternative browser.

You should upgrade or use an alternative browser.

In summary, the conversation discusses the concept of mass flow and how it relates to the observed brightness of the sun. It is noted that the sun emits light at a constant speed and power, but due to the decreasing density of photons at distant places, it appears dimmer. The proportionality of mass flow and surface density is also mentioned, as well as the idea of a constant mass flux between two concentric spherical surfaces.

- #1

Leo Liu

- 353

- 156

- Homework Statement
- .

- Relevant Equations
- .

Could someone explain the green highlight to me, please?

Physics news on Phys.org

- #2

anuttarasammyak

Gold Member

- 2,526

- 1,349

- #3

Leo Liu

- 353

- 156

Thanks for providing some physical intuition. But is it because the surface density of a mass flow isanuttarasammyak said:

$$\frac{\dot m}{A}=\frac{\dot m}{4\pi r^2}$$

?

- #4

anuttarasammyak

Gold Member

- 2,526

- 1,349

Yes. What's wrong with it ?

- #5

Leo Liu

- 353

- 156

Nothing. Just making sure I understand where this proportionality comes from.anuttarasammyak said:Yes. What's wrong with it ?

- #6

ergospherical

- 1,035

- 1,316

A vector space is a mathematical concept that describes a set of objects (vectors) that can be added together and multiplied by scalars to produce new vectors. In simpler terms, it is a collection of vectors that can be manipulated mathematically.

In 3D flow fields, vector spaces are used to represent the direction and magnitude of fluid flow at different points in space. This allows for the analysis and prediction of fluid behavior in complex systems, such as in aerodynamics or fluid mechanics.

Vector spaces are essential in understanding and analyzing 3D flow fields. The vectors in a vector space can represent the velocity, acceleration, or any other physical quantity associated with fluid flow in a 3D space.

A flow field in 3D space is a representation of how a fluid (such as air or water) moves and behaves in a three-dimensional space. It is often visualized using vector fields, where each vector represents the direction and magnitude of fluid flow at a specific point in space.

Vector spaces and 3D flow fields have numerous real-world applications, including in aerodynamics, weather forecasting, and fluid dynamics. They are also used in computer graphics and animation to create realistic fluid simulations.

- Replies
- 2

- Views
- 3K

- Replies
- 5

- Views
- 2K

- Replies
- 8

- Views
- 1K

- Replies
- 1

- Views
- 837

- Replies
- 1

- Views
- 2K

- Replies
- 23

- Views
- 2K

- Replies
- 0

- Views
- 775

- Replies
- 26

- Views
- 1K

- Replies
- 5

- Views
- 774

- Replies
- 4

- Views
- 1K

Share: