Can velocity in y axis be equal with velocity in x axis?
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So if uy=30 m/s and ux=30 m/s can we say that uy=ux ? my confusion is because velocity is vector they are not equal ( equal in magnitude but not dimension) . But can we say that they are equal in magnitude ?
classical-mechanics mathematical-physics
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up vote
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So if uy=30 m/s and ux=30 m/s can we say that uy=ux ? my confusion is because velocity is vector they are not equal ( equal in magnitude but not dimension) . But can we say that they are equal in magnitude ?
classical-mechanics mathematical-physics
New contributor
ado sar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
So if uy=30 m/s and ux=30 m/s can we say that uy=ux ? my confusion is because velocity is vector they are not equal ( equal in magnitude but not dimension) . But can we say that they are equal in magnitude ?
classical-mechanics mathematical-physics
New contributor
ado sar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
So if uy=30 m/s and ux=30 m/s can we say that uy=ux ? my confusion is because velocity is vector they are not equal ( equal in magnitude but not dimension) . But can we say that they are equal in magnitude ?
classical-mechanics mathematical-physics
classical-mechanics mathematical-physics
New contributor
ado sar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
ado sar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
ado sar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 47 mins ago


ado sar
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111
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ado sar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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ado sar is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
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3 Answers
3
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2
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$u_x$ and $u_y$ are components of a vector and are numbers. In order to write the vector these numbers must be multiplied with unit vectors $hat x$ and $hat y$. Thus one can say that $u_x = u_y$.
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Yes, one can say that $u_y=u_x$.
$u_y$ and $u_x$ are scalars. You multiply them by the unit vectors, $vecj$ and $veci$, to get the actual vectors, $u_yvecj$ and $u_xveci$.
When writers refer to 'components' of velocity (or any other vector), you usually have to work out from context whether they mean the scalar coefficients ($u_y$ and $u_x$ in your case) or the vector components, $u_yvecj$ and $u_yveci$. Your context told me that your question was about scalar coefficients.
1
The components of a vector aren't scalars. Scalars don't change under coordinate transformations.
– user7777777
20 mins ago
@user7777777 The way you represent components can change under transformation, but if you are working in a certain coordinate system the components can be thought of as scalars.
– Aaron Stevens
16 mins ago
I was using the terms 'scalar component' and 'vector component' as defined by Synge and Griffiths (Principles of Mechanics). But I've changed 'scalar component' to 'scalar coefficient' in my answer, as I think that 'coefficient' is a better word here.
– Philip Wood
8 mins ago
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up vote
-1
down vote
Basically you are right. Velocities are vectors that have directions and magnitudes. When you are referring to the magnitude only, use "speed", which is a scalar.
This does not answer the question, which asks about comparing components of vectors which is a legitimate thing to do.
– jacob1729
6 mins ago
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3 Answers
3
active
oldest
votes
3 Answers
3
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
2
down vote
$u_x$ and $u_y$ are components of a vector and are numbers. In order to write the vector these numbers must be multiplied with unit vectors $hat x$ and $hat y$. Thus one can say that $u_x = u_y$.
add a comment |Â
up vote
2
down vote
$u_x$ and $u_y$ are components of a vector and are numbers. In order to write the vector these numbers must be multiplied with unit vectors $hat x$ and $hat y$. Thus one can say that $u_x = u_y$.
add a comment |Â
up vote
2
down vote
up vote
2
down vote
$u_x$ and $u_y$ are components of a vector and are numbers. In order to write the vector these numbers must be multiplied with unit vectors $hat x$ and $hat y$. Thus one can say that $u_x = u_y$.
$u_x$ and $u_y$ are components of a vector and are numbers. In order to write the vector these numbers must be multiplied with unit vectors $hat x$ and $hat y$. Thus one can say that $u_x = u_y$.
answered 29 mins ago
my2cts
3,5082416
3,5082416
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add a comment |Â
up vote
1
down vote
Yes, one can say that $u_y=u_x$.
$u_y$ and $u_x$ are scalars. You multiply them by the unit vectors, $vecj$ and $veci$, to get the actual vectors, $u_yvecj$ and $u_xveci$.
When writers refer to 'components' of velocity (or any other vector), you usually have to work out from context whether they mean the scalar coefficients ($u_y$ and $u_x$ in your case) or the vector components, $u_yvecj$ and $u_yveci$. Your context told me that your question was about scalar coefficients.
1
The components of a vector aren't scalars. Scalars don't change under coordinate transformations.
– user7777777
20 mins ago
@user7777777 The way you represent components can change under transformation, but if you are working in a certain coordinate system the components can be thought of as scalars.
– Aaron Stevens
16 mins ago
I was using the terms 'scalar component' and 'vector component' as defined by Synge and Griffiths (Principles of Mechanics). But I've changed 'scalar component' to 'scalar coefficient' in my answer, as I think that 'coefficient' is a better word here.
– Philip Wood
8 mins ago
add a comment |Â
up vote
1
down vote
Yes, one can say that $u_y=u_x$.
$u_y$ and $u_x$ are scalars. You multiply them by the unit vectors, $vecj$ and $veci$, to get the actual vectors, $u_yvecj$ and $u_xveci$.
When writers refer to 'components' of velocity (or any other vector), you usually have to work out from context whether they mean the scalar coefficients ($u_y$ and $u_x$ in your case) or the vector components, $u_yvecj$ and $u_yveci$. Your context told me that your question was about scalar coefficients.
1
The components of a vector aren't scalars. Scalars don't change under coordinate transformations.
– user7777777
20 mins ago
@user7777777 The way you represent components can change under transformation, but if you are working in a certain coordinate system the components can be thought of as scalars.
– Aaron Stevens
16 mins ago
I was using the terms 'scalar component' and 'vector component' as defined by Synge and Griffiths (Principles of Mechanics). But I've changed 'scalar component' to 'scalar coefficient' in my answer, as I think that 'coefficient' is a better word here.
– Philip Wood
8 mins ago
add a comment |Â
up vote
1
down vote
up vote
1
down vote
Yes, one can say that $u_y=u_x$.
$u_y$ and $u_x$ are scalars. You multiply them by the unit vectors, $vecj$ and $veci$, to get the actual vectors, $u_yvecj$ and $u_xveci$.
When writers refer to 'components' of velocity (or any other vector), you usually have to work out from context whether they mean the scalar coefficients ($u_y$ and $u_x$ in your case) or the vector components, $u_yvecj$ and $u_yveci$. Your context told me that your question was about scalar coefficients.
Yes, one can say that $u_y=u_x$.
$u_y$ and $u_x$ are scalars. You multiply them by the unit vectors, $vecj$ and $veci$, to get the actual vectors, $u_yvecj$ and $u_xveci$.
When writers refer to 'components' of velocity (or any other vector), you usually have to work out from context whether they mean the scalar coefficients ($u_y$ and $u_x$ in your case) or the vector components, $u_yvecj$ and $u_yveci$. Your context told me that your question was about scalar coefficients.
edited 7 mins ago
answered 28 mins ago
Philip Wood
6,9293615
6,9293615
1
The components of a vector aren't scalars. Scalars don't change under coordinate transformations.
– user7777777
20 mins ago
@user7777777 The way you represent components can change under transformation, but if you are working in a certain coordinate system the components can be thought of as scalars.
– Aaron Stevens
16 mins ago
I was using the terms 'scalar component' and 'vector component' as defined by Synge and Griffiths (Principles of Mechanics). But I've changed 'scalar component' to 'scalar coefficient' in my answer, as I think that 'coefficient' is a better word here.
– Philip Wood
8 mins ago
add a comment |Â
1
The components of a vector aren't scalars. Scalars don't change under coordinate transformations.
– user7777777
20 mins ago
@user7777777 The way you represent components can change under transformation, but if you are working in a certain coordinate system the components can be thought of as scalars.
– Aaron Stevens
16 mins ago
I was using the terms 'scalar component' and 'vector component' as defined by Synge and Griffiths (Principles of Mechanics). But I've changed 'scalar component' to 'scalar coefficient' in my answer, as I think that 'coefficient' is a better word here.
– Philip Wood
8 mins ago
1
1
The components of a vector aren't scalars. Scalars don't change under coordinate transformations.
– user7777777
20 mins ago
The components of a vector aren't scalars. Scalars don't change under coordinate transformations.
– user7777777
20 mins ago
@user7777777 The way you represent components can change under transformation, but if you are working in a certain coordinate system the components can be thought of as scalars.
– Aaron Stevens
16 mins ago
@user7777777 The way you represent components can change under transformation, but if you are working in a certain coordinate system the components can be thought of as scalars.
– Aaron Stevens
16 mins ago
I was using the terms 'scalar component' and 'vector component' as defined by Synge and Griffiths (Principles of Mechanics). But I've changed 'scalar component' to 'scalar coefficient' in my answer, as I think that 'coefficient' is a better word here.
– Philip Wood
8 mins ago
I was using the terms 'scalar component' and 'vector component' as defined by Synge and Griffiths (Principles of Mechanics). But I've changed 'scalar component' to 'scalar coefficient' in my answer, as I think that 'coefficient' is a better word here.
– Philip Wood
8 mins ago
add a comment |Â
up vote
-1
down vote
Basically you are right. Velocities are vectors that have directions and magnitudes. When you are referring to the magnitude only, use "speed", which is a scalar.
This does not answer the question, which asks about comparing components of vectors which is a legitimate thing to do.
– jacob1729
6 mins ago
add a comment |Â
up vote
-1
down vote
Basically you are right. Velocities are vectors that have directions and magnitudes. When you are referring to the magnitude only, use "speed", which is a scalar.
This does not answer the question, which asks about comparing components of vectors which is a legitimate thing to do.
– jacob1729
6 mins ago
add a comment |Â
up vote
-1
down vote
up vote
-1
down vote
Basically you are right. Velocities are vectors that have directions and magnitudes. When you are referring to the magnitude only, use "speed", which is a scalar.
Basically you are right. Velocities are vectors that have directions and magnitudes. When you are referring to the magnitude only, use "speed", which is a scalar.
answered 33 mins ago
Trebor
2348
2348
This does not answer the question, which asks about comparing components of vectors which is a legitimate thing to do.
– jacob1729
6 mins ago
add a comment |Â
This does not answer the question, which asks about comparing components of vectors which is a legitimate thing to do.
– jacob1729
6 mins ago
This does not answer the question, which asks about comparing components of vectors which is a legitimate thing to do.
– jacob1729
6 mins ago
This does not answer the question, which asks about comparing components of vectors which is a legitimate thing to do.
– jacob1729
6 mins ago
add a comment |Â
ado sar is a new contributor. Be nice, and check out our Code of Conduct.
ado sar is a new contributor. Be nice, and check out our Code of Conduct.
ado sar is a new contributor. Be nice, and check out our Code of Conduct.
ado sar is a new contributor. Be nice, and check out our Code of Conduct.
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