The proof of mass vector.
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From: Bob Kolker on 26 Apr 2007 21:11 Ka-In Yen wrote: > On Apr 27, 7:10 am, Bob Kolker <nowh...(a)nowhere.com> wrote: > >>Ka-In Yen wrote: >> >>>On Apr 24, 9:25 am, Bob Kolker <nowh...(a)nowhere.com> wrote: >> >>>>Ka-In Yen wrote: >> >>>>>Dear Bob Kolker, >> >>>>>Thank you for your comment. Pressure(p) is a scalar. >>>>>Force and area are vectors. >> >>>>Force can be represented by a vector. That is because forces have both >>>>megnitude and direction. Area cannot. Area is a measure. What is the >>>>direction of an area? >> >>>Let's check this equation Pressure = Force / Area. >>>If force is a vector and area is a scalar, then >>>pressure is a vector. This is a disaster of physical >>>mathematics. >> >>You did not answer my question. >> >>What is the direction of an area? > > > Dear Bob, > > In 3D vector algebra, there are four basic > operations: addition, dot product, cross > product, and scalar multiplication. To get > the area of the parallelogram generated > from vectors A and B, cross product has > to be used: area=AXB; so the area > HAS TO be a vector. > > A parallelepiped is constructed from three > vectors: A, B, and C. The volume of the > parallelepiped is > > volume=A dot (B cross C). > >>From the above equation, we can conclude > that area HAS TO be a vector. What is the direction of an area? Bob Kolker >
From: Ka-In Yen on 27 Apr 2007 19:51 On Apr 27, 9:11 am, Bob Kolker <nowh...(a)nowhere.com> wrote: > Ka-In Yen wrote: > > On Apr 27, 7:10 am, Bob Kolker <nowh...(a)nowhere.com> wrote: > > >>Ka-In Yen wrote: > > >>>On Apr 24, 9:25 am, Bob Kolker <nowh...(a)nowhere.com> wrote: > > >>>>Ka-In Yen wrote: > > >>>>>Dear Bob Kolker, > > >>>>>Thank you for your comment. Pressure(p) is a scalar. > >>>>>Force and area are vectors. > > >>>>Force can be represented by a vector. That is because forces have both > >>>>megnitude and direction. Area cannot. Area is a measure. What is the > >>>>direction of an area? > > >>>Let's check this equation Pressure = Force / Area. > >>>If force is a vector and area is a scalar, then > >>>pressure is a vector. This is a disaster of physical > >>>mathematics. > > >>You did not answer my question. > > >>What is the direction of an area? > > > Dear Bob, > > > In 3D vector algebra, there are four basic > > operations: addition, dot product, cross > > product, and scalar multiplication. To get > > the area of the parallelogram generated > > from vectors A and B, cross product has > > to be used: area=AXB; so the area > > HAS TO be a vector. > > > A parallelepiped is constructed from three > > vectors: A, B, and C. The volume of the > > parallelepiped is > > > volume=A dot (B cross C). > > >>From the above equation, we can conclude > > that area HAS TO be a vector. > > What is the direction of an area? This is a question for high school student. You should ask your high school teacher.
From: Androcles on 27 Apr 2007 20:09 "Ka-In Yen" <yenkain(a)yahoo.com.tw> wrote in message news:1177717895.522829.290300(a)l77g2000hsb.googlegroups.com... > On Apr 27, 9:11 am, Bob Kolker <nowh...(a)nowhere.com> wrote: >> What is the direction of an area? > > This is a question for high school student. You should > ask your high school teacher. > Ok, high school teacher... What is the direction of an area, fuckhead?
From: Ka-In Yen on 27 Apr 2007 21:00 On Apr 26, 6:43 pm, Eric Gisse <jowr...(a)gmail.com> wrote: > On Apr 25, 4:17 pm, Ka-In Yen <yenk...(a)yahoo.com.tw> wrote: > > On Apr 24, 9:25 am, Bob Kolker <nowh...(a)nowhere.com> wrote: > > > Force can be represented by a vector. That is because forces have both > > > megnitude and direction. Area cannot. Area is a measure. What is the > > > direction of an area? > > > Let's check this equation Pressure = Force / Area. > > If force is a vector and area is a scalar, then > > pressure is a vector. This is a disaster of physical > > mathematics. > > The only disaster is your freshman-level physics understanding. Quit > trying to pull vectorial information from equations that are only > valid in one dimension. Finish your homework, or I will call your mami. Home work for Eric Gisse: A rectangle sits in 3D space. The area vector of the rectangle is A, and the legth vector of one side of the rectangle is L. Please find the length vector of the other side of the rectangle?
From: Ka-In Yen on 27 Apr 2007 21:01
On Apr 27, 8:25 am, Phineas T Puddleduck <phineaspuddled...(a)gmail.com> wrote: > In article <1177633150.538170.39...(a)c18g2000prb.googlegroups.com>, > Ka-In Yen <yenk...(a)yahoo.com.tw> wrote: > > > > > > > > What is the direction of an area? > > > Dear Bob, > > > In 3D vector algebra, there are four basic > > operations: addition, dot product, cross > > product, and scalar multiplication. To get > > the area of the parallelogram generated > > from vectors A and B, cross product has > > to be used: area=AXB; so the area > > HAS TO be a vector. > > > A parallelepiped is constructed from three > > vectors: A, B, and C. The volume of the > > parallelepiped is > > > volume=A dot (B cross C). > > > >From the above equation, we can conclude > > that area HAS TO be a vector. > > You did not answer Bob's question. Go get a high school diploma. |