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seen Feb 10 at 8:26

Feb
7
awarded  Critic
Feb
7
comment Regarding the centrifugal force in a 3-body system
Are you sure that you have to deal with gravitation and centrifugal forces? You state that you want to find equations of motion for the Moon, neglecting its infuence on Earth and Sun. Therefore, I assume that the task is to describe Moon's path as the sum of two orbits (Earth around Sun plus Moon around Earth), and use time derivatives to calculate its velocity and acceleration, respectively.
Feb
7
comment Find initial velocity when given max height of 100m
Hints: The $v$ in your equation is the initial velocity you are looking for. c does not matter. Use time derivative of h(t) to get v(t). What is v(t) at the height of 100 m?
Feb
6
awarded  Yearling
Feb
6
comment Why does the windshield of my car freeze even if the outside temperature is above freezing?
That is right. When the dew point is below zero degrees Celsius and the evaporation heat is removed from the system, then white frost may form and even water surfaces can freeze in shallow puddles. But this requires availbale liquid water. So in case of a wind shield, first condensation must occur, and then dry conditions with evaporation causing freezing of the remining water.
Feb
6
answered Why does the windshield of my car freeze even if the outside temperature is above freezing?
Feb
6
answered How can a fly be in the space of a roofless car, get out of the car space and get back in while the car is driving at the speed of 80mph?
Jul
10
answered Paraphrasing speed and heat capacity
Jul
10
awarded  Commentator
Jul
10
comment Rate of twinkling of stars
If you divide a velocity by a length you get a frequency, so when a turbulent eddy of 1 m size is passing by your anemometer at 10 m/s you will get a contribution in the energy spectrum at 10 Hz. Stellar scintillation is mainly influenced by turbulence in the upper atmosphere. There is no scintillation frequency, but noise (a spectrum of frequencies). This paper shows how stellar scintillation affects telescopes at different sites: arxiv.org/pdf/1208.3824v1.pdf.
Jul
9
answered How occurs the enantiomorph of the mirror?
Jul
9
comment How occurs the enantiomorph of the mirror?
Have you considered checking wikipedia for some basic definitions and formulas? Then you may come up with a more specific question.
Jul
9
comment Why do we feel a sudden chill?
So the room is not closed. Thank you anna v for the link.
Jul
9
answered Why do we feel a sudden chill?
Jul
9
comment Why do we feel a sudden chill?
Nothing happens without a reason - especially not in physics. Please provide a link to some YouTube video where "we" can observe what you mean.
Jul
9
comment Why do we feel a sudden chill?
As I said: air currents are caused by pressure differences. If someone opens a door and cold air (possibly from the basement, because a small basement window is broken) is advected towards you, you fell the drop in temperature. If the door is closed again, the air stops. Old, dark houses may make you shiver more, but thermodynamically it makes no difference.
Jul
9
comment Why do we feel a sudden chill?
This is a metaphysical or at best psychological question. You assume that "we" feel something in old houses. However, air circulation and temperature are not correlated to the age of a building. Strong air currents arise if the front door of a house is opened, allowing two air masses to mix, or to level pressure gradients if there is another opening (window, chimney). This effect will pass away quickly when the door is closed again.
Jul
9
answered Why is the rainy season in the winter for some (mediterranean?) climates and in the summer for other (tropical?) climates?
Jul
9
answered Rate of twinkling of stars
Jul
9
comment Why doesn't my house get misty?
This equation does not apply for droplets, where diameter plays a crucial role (google "droplet evaporation"). Furthermore, you are assuming cold and humid within the house. This does not help with the answer of this question because then you can construct a situation in which the fog droplets do not evaporate at all. For realistic situations, you will get an evaporation time of the order of 1 s.