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9h
comment Physics Centripetal Force problem
Hint, what is the distance from the center to the edge of the space station? Use that in $\frac{v^2}{r} = \omega^2 r$
9h
comment Please help me with this doubt from rotational dynamics
I wish you had explained what exactly is your doubt and why.
9h
answered Please help me with this doubt from rotational dynamics
1d
comment Applicable force at constant velocity
I'm voting to close this question as off-topic because of insufficient background or research. Any introductory text on Newton's Laws of motion covers this question extensively.
1d
revised A lever arm-definition question
added 321 characters in body
1d
comment A lever arm-definition question
The two interpretations are identical (or more accurately, dual to each other).
2d
revised how to calculate the angular velocity of ball from hitting angle?
added 20 characters in body
2d
answered how to calculate the angular velocity of ball from hitting angle?
2d
comment how to calculate the angular velocity of ball from hitting angle?
You mean an instantaneous force (or impulse)?
2d
comment Rigid Body Dynamics - Calculating Rotation of an Object
It seems that you are using spherical coordinates for the location of the body, but not for the orientation. What you need is to decide on a set of Euler angles in order to compose a 3×3 rotation matrix from three elementary rotations.
2d
comment Is the center of mass in general relativity equal to the center of mass in newtonian gravity?
Isn't the metric used to measure distances, and when combined with mass don't you get a center of mass?
2d
comment How do I find the co-ordinates and speed of this particle on the x-y plane?
I suggest trying the components separately first and then asking for help if you get stuck.
Feb
9
comment Diagonal of a thin rectangular foil, inertial principal axis?
The off-diagonal terms are zero only on principal axes of inertia, by definition.
Feb
9
comment Diagonal of a thin rectangular foil, inertial principal axis?
Body coordinates in this case are along the sides (as x and y) and centered at the center of mass.
Feb
9
answered Equivalent spring constant of setup
Feb
8
revised Diagonal of a thin rectangular foil, inertial principal axis?
added 261 characters in body
Feb
8
comment Diagonal of a thin rectangular foil, inertial principal axis?
Is the foil on the xy axis? You need to define your coordinate systems and orientations?
Feb
8
comment Do you say it right?
Hence the difference in customary units and scientific units. My weight in customary units is in pounds, stones, kilograms, etc. My weight in scientific units is in pounds-force or Newton.
Feb
8
answered Diagonal of a thin rectangular foil, inertial principal axis?
Feb
5
comment To prove uniqueness of the rotation tensor associated with rotation of a rigid body
I read your last line which says: "Now, I am not sure how to prove that $\overline{\overline {R}}_{lk}=\overline{\overline {R}}_{ji}$. And this is where I needed help".