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Geometry
New post in Geometry
When will the velocity of a particle be perpendicular to it's initial velocity?
May 17th, 2020
geometry
vectors
kinematics
homework-and-exercises
Perspective Redux (why objects seem smaller as the distance increases)
March 13th, 2020
distance
geometry
optics
vision
How to determine Center of Gravity?
April 25th, 2020
geometry
newtonian-gravity
newtonian-mechanics
Why Dot Product is Scalar? why not vector? as cross product is vector?
August 9th, 2022
vectors
geometry
What is the meaning of inclination $1$ in $x$?
September 3rd, 2020
definition
geometry
kinematics
terminology
How to determine the minimum force in these questions?
August 6th, 2020
geometry
vectors
forces
newtonian-mechanics
homework-and-exercises
Why do far away objects appear to move slowly in comparison to nearby objects?
August 2nd, 2022
kinematics
geometry
Is there a geometric interpretation of the spacetime interval?
October 14th, 2020
special-relativity
geometry
spacetime
Why are three parameters required to express rotation in 3 dimension?
August 12th, 2022
mathematics
geometry
rotational-dynamics
Does Pythagoras theorem hold for length contraction according to Special relativity?
July 21st, 2021
geometry
inertial-frames
metric-tensor
special-relativity
Geometrical interpretation of the Dirac equation
November 2nd, 2020
clifford-algebra
differential-geometry
geometry
dirac-equation
spinors
Do perfect spheres exist in nature?
August 1st, 2022
geometry
nature
soft-question
What's the dimensionality of a solid angle?
June 1st, 2020
geometry
units
Why sphere minimizes surface area for a given volume?
December 8th, 2020
surface-tension
geometry
fluid-dynamics
Triple-right triangle experiment: what's the minimum distance?
December 27th, 2020
curvature
differential-geometry
earth
geometry
Can an angle be defined as a vector?
August 1st, 2022
geometry
angular-velocity
conventions
vectors
rotation
Is Dyson Sphere a stable construction?
April 8th, 2020
geometry
gravity
energy
stars
stability
Gravitation is not force?
September 12th, 2020
general-relativity
gravity
forces
geometry
curvature
Given two vectors (with no common point), is a dot product between them possible?
April 24th, 2020
coordinate-systems
reference-frames
vectors
geometry
How is Chasles' Theorem, that any rigid displacement can be produced by translating along a line and then rotating about the same line, true?
October 25th, 2020
newtonian-mechanics
rigid-body-dynamics
rotation
geometry
kinematics
Proof/explanation that Sun is bigger and more distant from Earth than Moon is, Middle Age technology allowed only
November 12th, 2021
eclipse
geometry
history
astronomy
solar-system
Why does the light side of the moon appear not to line up correctly with the evening sun?
August 1st, 2022
geometry
astronomy
sun
moon
How did they know the radius of the earth in ancient times?
April 15th, 2022
geometry
history
earth
In a ball with random thread/strings, how does the density of threads/strings change with radius?
March 28th, 2020
homework-and-exercises
geometry
density
string
Is there a proof that the set of real numbers can exactly represent distances?
May 5th, 2020
geometry
mathematics
distance
foundations
If diverging rays never meet, why do parallel rays meet at infinity?
January 6th, 2022
mathematics
geometry
definition
reflection
geometric-optics
How many times can light revolve around a black hole?
March 11th, 2020
geometry
geometric-optics
general-relativity
black-holes
differential-geometry
What is the exact meaning of homogeneity in cosmology?
August 1st, 2022
cosmology
spacetime
geometry
symmetry
definition
How far into space does one have to travel to see the entire sphere of earth?
February 17th, 2020
geometry
Is it possible for a physical object to have an irrational length?
August 8th, 2022
mathematics
geometry
measurements
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