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Jul
9
comment Why is universe expanding?
this answer looks good too. I think there are many reasons why we know the universe is expanding and this is certainly one of them, good job.
Jul
5
answered Effects of vertical circular motion to the body weight
Jul
4
answered Can pure mathematics alone give proofs in science
Jul
4
comment Why is universe expanding?
@ShingLau, expansion faster than speed of light is allowed but this is because it is the space that is expanding, rather than the galaxies moving. The galaxies themselves are not able to move faster than the speed of light (due to relativity) however if more space is added between us and the galaxy (as is the case in an expanding universe), it may give the appearance that the galaxy is moving faster than light speed (although it is not). But this is how we know expansion is due to increased addition of space, rather than due to simple movement of galaxies.
Jul
3
answered Why is universe expanding?
Jul
3
comment Derivative of kinetic energy
Yes. The chain rule is the part where d/dt = dv/dt times d/dv
Jun
30
comment Spinning rubber ball with equatorial ridge
@JohnDuffield, the scenario you are describing would be consistent with the plane being parallel with the ground, not perpendicular.
Jun
30
comment Spinning rubber ball with equatorial ridge
Do you mean the plane is parallel to the ground?
Jun
30
answered Hot water from a faucet
Jun
29
answered Derivative of kinetic energy
Jun
29
answered Why does a change of direction imply an acceleration?
Jun
29
comment Electric field scalar quantiy or vector quantity
@AUmarMukthar, well that one is a vector. Also electric field is not the same as electric field potential. They describe two different quantities and also the latter is a scalar while the former is a vector.
Jun
28
comment Can I convert Power to Force?
Like you said, Power = Force * Velocity. Therefore knowing power alone isn't sufficient to calculate force.
Jun
28
comment Electric field scalar quantiy or vector quantity
@AUmarMukthar, remind me again how the definition of a vector is that a test charge is used? I thought a vector was something with a magnitude and a direction.
Jun
28
answered Electric field scalar quantiy or vector quantity
Jun
28
answered “This Side Up” in Zero g?
Jun
28
comment Why is my two body model not working?
Thanks, you hit the nail on the head of what is wrong with the program. Thanks for your tips too, I'm just starting out in numerical methods.
Jun
28
accepted Why is my two body model not working?
Jun
28
comment Why is my two body model not working?
@Jared, yes not technically, but the motion is oscillatory with a maximum amplitude. My graph clearly shows amplitude increasing (and decreasing) all over the place. Harmonic oscillatory or not, the results don't seem to match the code.
Jun
28
comment Why is my two body model not working?
@Jared, gravity is proportional to 1/d^2, but gravity behaves like a harmonic oscillator. I think 1/d should too. Nevertheless 1/d^2 also gives just as weird results.