If I take this wire and I make a cross-section of that wire-- this is wire 1 and this is wire 2-- then at any moment in time, as the voltage wave passes by, this may be positive, that is that rho of s, and this will be negative, that's that rho of s .
"That's that rho of s" is a phrase coined by Prof. Walter Lewin in his popular physics lectures at MIT. It refers to the mathematical symbol "ρ" (rho) which represents density, and "s" which represents position. This phrase is used to introduce the concept of density and its relationship to position in the context of physics problems.
Prof. Lewin uses this phrase to emphasize the importance of understanding the concept of density in physics problems. He often explains that density is a crucial factor in determining the behavior of objects, and by using this phrase, he aims to make it more memorable and relatable for his students.
In physics, "rho of s" refers to the density of a material at a specific position. Density is defined as the mass of an object divided by its volume, and it is a measure of how tightly packed the particles of a substance are. By understanding the relationship between density and position, we can better understand the behavior of objects in different situations.
Prof. Lewin typically explains "That's that rho of s" by using real-life examples and visual aids. He often demonstrates how the density of an object can change depending on its position, and how this affects its behavior. This helps students to understand the concept in a more practical and memorable way.
Yes, understanding "That's that rho of s" is crucial for studying physics. Density is a fundamental concept in physics, and it is used to explain various phenomena in the physical world. By understanding this concept, students can better understand the behavior of objects and solve physics problems more effectively.