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I thought velocity was always a vector quantity, one with both magnitude and direction.
When it came to suvat equations, where v = final velocity, and u = initial velocity, I thought both of those were vector quantities, e.g;
v (final velocity) 112km/hr North
u (initial velocity) 0km/hr (what do we put for direction when the object is initially stationary?)
But in a Khan Academy question they ask what does the letter v (lower case with no arrow above it, or anything else) stand for, and whether it’s a vector or a scalar.
I answered ‘velocity’ (it was multiple choice with no option for ‘final velocity’) and that it was a vector.
Their answer was;
“The symbol v represents speed, a scalar.”
I know speed is a scalar, but thought v stood for final velocity. I also know that final velocity IS speed, but thought that we had to include direction given the velocity part.
The confusion likely comes from how Khan Academy framed the question. Sometimes, in general physics problems, v can refer to speed (the magnitude of velocity) if direction is not relevant. However, in SUVAT equations, it's normally understood as velocity. Their wording might have been trying to emphasize that v without an arrow can sometimes mean just speed, but in kinematics, you were correct to associate it with velocity.
I thought velocity was always a vector quantity, one with both magnitude and direction.
When it came to suvat equations, where v = final velocity, and u = initial velocity, I thought both of those were vector quantities, e.g;
v (final velocity) 112km/hr North
u (initial velocity) 0km/hr (what do we put for direction when the object is initially stationary?)
But in a Khan Academy question they ask what does the letter v (lower case with no arrow above it, or anything else) stand for, and whether it’s a vector or a scalar.
I answered ‘velocity’ (it was multiple choice with no option for ‘final velocity’) and that it was a vector.
Their answer was;
“The symbol v represents speed, a scalar.”
I know speed is a scalar, but thought v stood for final velocity. I also know that final velocity IS speed, but thought that we had to include direction given the velocity part.
You're absolutely right that velocity is a vector quantity, meaning it has both magnitude and direction. In the context of SUVAT equations, v typically represents final velocity, which is indeed a vector. The initial velocity, u, is also a vector, and if an object starts from rest, we usually assume its velocity is 0 m/s in the direction it will eventually move.
Names of large numbers - Prefixes
This article lists and discusses the usage and derivation of names of large numbers, together with their possible extensions.
Two naming scales have been used in English and other European languages since the early modern era – the long and short scales. Most English variants use the short scale today, but the long scale remains dominant in many non-English-speaking areas, including continental Europe and Spanish-speaking countries in Latin America. These naming procedures are based on taking the number n occurring in
(short scale) or (long scale) and concatenating Latin roots for its units, tens, and hundreds place, together with the suffix -illion.Names of numbers above a trillion are rarely used in practice; such large numbers have practical usage primarily in the scientific domain, where powers of ten are expressed as 10 with a numeric superscript.
Indian English does not use millions, but has its own system of large numbers including lakhs and crores. English also has many words, such as "zillion", used informally to mean large but unspecified amounts.
Standard dictionary numbers
http://astro.unl.edu/classaction/tables/intro/si_prefixes.jpg
It is interesting how these systems have evolved and how their use varies across languages and regions. The short scale, which is common in English-speaking countries, simplifies the situation somewhat, but the long scale (used in some European and Latin American countries) can cause some confusion when comparing data internationally.
Hi there! I`m new here
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