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Nicholas Kang

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About Nicholas Kang

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  1. Ok, though I don't take biology now after high school. I still remember what I learn. This is more of a biochemistry question. The explanation is simple. First, you need to understand what is osmosis, osmotic pressure and how osmoregulation works. Osmoregulation (See:https://en.wikipedia.org/wiki/Osmoregulation) is basically the regulation of an organism's body water content to maintain its osmotic pressure. You also need to understand the term endoosmosis, exosmosis, hypertocnic and hypotonic etc. Ok ,we start with the simple ones first. 3 types of solutions exist: sol
  2. Ok, I think I need to further clarify my case. I don't mean someone just sits on lunar surface and watch Earth wobbling. I mean, get yourself up and high away from lunar surface and stay idle there, see how Earth moves around the Moon. In my test, it does "orbit" around the Moon this way (Moon is observer, Sun is focus, hence Earth is moving): Then, Earth to the right And finally it is between moon and Sun Closer view: Earth is missing which proves that it is really between Moon and Sun. Then, Earth to the left And finally back again
  3. Hello I am working on an orbit trajectory plot tool with my friend from the US. I have some question to ask all of you about this question. In our trajectory plot, we would like to fix Moon as the center of our orbit plot. Then, from our perspective (the moon), what would the Earth's orbit be or look like? From the moon's perspective, would the Earth seems like orbiting the Moon? If this is the case, how long does it take for Earth to "orbit" the Moon? The same period as lunar's orbit, i.e. 27 days? Thanks for answering. Nicholas.
  4. Ok, Sensei. In the diagram, Cl atom is larger than B atom. Now, BabcockHall says he thinks Chlorine's orbitals will not (unsure) overlap effectively with the orbitals of boron. So, what do you think, Sensei? What is your opinion? (Simply put, what is your answer to my question? )
  5. Well, this question is basically about mechanics, work and energy. There is no need to use suvat in this case. Strategy: Height already given-Hint: gravitational potential energy Speed given-Hint: kinetic energy Ok, apply principle of conservation of energy at both A and B Assume you already know the basic knowledge: EK = 0.5mv2 , EP = mgh, Assume g=10 ms-2 and let Fc = Frictional force, then EK at A + EP at A = EK at B + EP at B + Word done against friction 3(10)(6) + 0.5(3)(4)2 = (3)(10)(2) + 0.5(3)(8)2 + Fc(12) So, solve for Fc , you get Fc = 4N That is the frictional force is 4N
  6. Are you sure? I thought Boron is larger than Chlorine. The atomic size of elements decreases across a period. And I have checked the atomic radius for both Boron and Chlorine. Boron: 87 pm Chlorine: 79 pm So, apparently, Boron is larger than Chlorine.
  7. Can you explain it in detail? How does electronegativity affects hybridization?
  8. Ok, finally someone replied. Thanks fiveworlds. Personally, I think this configuration is more stable, since hybridisation stabilizes a molecule. Apparently, if achieving octet or duplet is the only thing required for the formation of a particular molecule, why would you hybridise the central atom as well? So, it is clear that you hybridise atoms of molecules to make them stable and hybridise all atoms would definitely make the whole molecule stable. Am I wrong? Nicholas.
  9. I have been offline for almost 2 years and now I am back. I hope you guys still remember me... Here is a question on physical chemistry. Simple question. It is about Valance Bond theory and the use of hybridisation/hybridization (depending on whether your English is American/British variant) concept. My teacher taught me how to explain Boron trichloride's structure using VB theory. Boron atom undergoes sp2 hybridisation. Each sp2 hybrid orbitals will have an unpaired electron that will be shared with the unpaired electron in Chlorine's 3p orbital. So, the orbital overlap diagram look
  10. Here is another one. Falcon 9 carrying OG2 in its fairing poised for launched at KSC. Thanks for enjoying the screenshot. Regards, Nicholas.
  11. Hello, I have not been around SFN for quite some time. I was focusing on my studies and also flying to different orbits using Orbiter Space Flight Simulator. Nice to see all of you again. Here I would like to start a new thread for those who use Orbiter and love to share their beautiful screenshots. I will start first. Here are 2 (beautiful, or maybe opposite; beauty is in the eye of the beholder) screenshots captured using Orbiter. The first is ThaiCom 8 launched to elliptical transfer orbit after SECO of Falcon 9. The second is GAIA of ESA in Largrange Point 2 or
  12. I shall give it a try. Let's deal with the equations first. You had followed what studiot said. So, solve the three equations. (In Malaysia, we are taught that general quadratic equation is ax2+bx+c=0; we don't use z in place of c) 4a-2b+c=0--EQ1 16a+4b+c=0--EQ2 9a+3b+c=0--EQ3 EQ1 x2-- 8a-4b+2c=0 4b=8a+2c Substitute 4b=8a+2c into EQ1 You get: 16a+8a+2c=0 24a+3c=0 3c=-24a c=-8a Substitute c=-8a into EQ1 You get: 4a-2b-8a=0
  13. studiot, I can roughly figure out where are you leading me to. Also, based on your last assumptions and what pavelcherepan had said, you must be talking be about thermal equilibrium with the surroundings. So, the final temperature must be equal to the temperature of the surroundings instead of just 10 degree Celsius. Is this what you mean? If so, this question must not be talking about a closed system, it must be an open system if you talk about surroundings.
  14. Assumptions based on studiot. Good assumptions, studiot. At least you "fill in the gaps required." Solutions: Picture the problem Imagine an ice cube being placed in a glass of water. Ice cube is 0 degree Celsius. Water is 10 degree Celsius. We know that heat is transferred from the water to the ice so that thermal equilibrium is reached somewhere between 0 and 10 degree Celsius. So, we assume: heat absorbed by the ice = heat released by the water, that is, Qabsorbed = Qreleased We first assume that all sensible heat is removed from the water before latent heat of water set
  15. As a high school student still in the process of learning, I, Nicholas Kang would like to express my utmost gratitude to Dr. Tom Swanson for his meticulous teaching. Thank you Dr. Tom Swanson. You make my day. Anyway, I don' think the above post was a bad one. You see, I have studied painstakingly to comprehend Relativity, at least to some degree. (No, I am not asking for praise or anything in return, just a statement) Not all high school students can study modern physics and classical physics at the same time, especially when they need to go through the hardships of choosing eithe
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