Physics

Use the link above to watch the video. It starts with about a six minute video clip from the European Space Agency (ESA) explaining the concept of Newton’s first law (The Law of Inertia) and includes several demonstrations with explanations. Following this clip are three short video demonstrations. Be sure to watch these carefully, as you will be asked questions regarding what you see in the quiz and you must select one of the three demonstrations to use in your main post. The video concludes with a short quiz.Be sure to watch the entire video, and complete the quiz before posting any discussions.For this discussion you must post one main discussion post and reply to one other student’s post.Your main post must include:1. State which of the three demonstrations you are going to discuss (Demonstration 1 is the chalk demonstration, Demonstration 2 is the stacked coins demonstration and Demonstration 3 is the egg drop demonstration. (5 points***)2. A full explanation of the science. If there are forces, explain what they are, if they are balanced or unbalanced etc. Do any forces change and if so how? What specifically causes any object to change its motion, etc. (15 points)3. Think of something you experience in your daily life that is related to what is shown in the demonstrations. Share this with your fellow students, be sure to explain your example and how it is related to these demonstrations. (10 points). [For example if you can think of something that relates while driving your car you might state…. while driving my car I experience inertia in this way….]. Once you think about it, you should be able to find numerous ways you experience Newton’s first law often. Try to pick an experience that you feel other students can relate to as well.In addition to your main post, you must provide a substantive reply post to another student’s post. Be respectful, but if the student’s explanation is missing anything, add what you think is missing, or if there are errors, suggest the correct explanation. Include a comment on how you might relate to the experience they shared. Consider adding something to this experience that takes the discussion farther or in a new direction… For example, if a student uses a seat belt example, you might add a new, but different seat belt example, or a situation that might be different but still relates to that example such as an experience in an accident (or a near accident)….Think of it this way… if you were in a group setting how would you add something to a conversation on this topic and keep the conversation going. It must be something more than “I can relate to your experience”… or “I had the same experience”. These examples aren’t substantive. But stating “I had a similar experience but I…” does.

a) Without doing any calculation, write down the approximate electric field (magnitude &direction) a distance d from the origin, assuming that d>>a. Make sure to justify your answer.b) Calculate the electric potential at a point P on the z axis, a distance z from the center of the object. Assume that the potential at infinity is zero. You don’t need to evaluate any integrals you run into. Just leave the answer in integral form.c) Calculate the electric field (magnitude and direction) at a point P on the z axis, a distance z from the center of the ring. You don’t need to evaluate any integrals you run into. Just leave the answer in integral form.d) Take the limit z>>a to show that your electric field reproduces your answer from part (a). [Hint: It helps to write your expression in terms of the small dimensionless parameter a/z.]

a) Does q b feel any electric forces from q c , q d , or any of the surface charges induced by q c or q d ? Explain your reasoning.b) How much total charge accumulates on each of the two surfaces of the cavities? How much total charge accumulates on the exterior surface? Explain your reasoningc) Are the charge densities induced on the cavity surfaces uniform? Explain your reasoning.d) If r is very large compared to the radius of the conductor, what is the approximate magnitude of the force felt on q d ?

The phase diagram for the Al – Si system (the basis of aluminium casting alloys) is shown in Figure 1. Explain what is happening when the alloy Al – 30 wt % of Si is cooled from 900 ? to room temperature. You need to consider phasetransformation, microstructure changes, temperatures, and composition.(6 marks)Figure 1: Phase Diagram of Al – Si binary system(ii) You have been asked to calculate the critical nucleus radius, r* and the activation free energy ?????? for the solidification of pure nickel if nucleation is homogenous. The latent heat of fusion and surface energy of nickel are given as -2.53 x 109 J/m3 and 0.250 J/m2 respectively. The supercooling curve value for nickel is 319 ?. The melting temperature of nickel is 1455 ?.(4 marks)

1. Moving balloons:In the picture below, the balloons on the left and middle are held in place. The right balloon is free to move.Is it possible to add positives or negatives on the free balloon that would make it moveto the left ( ß )? ­­­­­___________If so, then draw positives or negatives on the balloon that would make it move, and explain why you think it would work? ­­­­­­­­­

Please help me write a report focusing on “photocatalysis of TiO2 material”. Most of the papers regarding this topic can be found online.Requirement:- 8 to 10 pages long- Does not have to be strictly plagiarism free (you can pick certain ideas from certain paper and lightly paraphrase their idea. You can just copy paste their images if they have any)

Numerical simulationFinal report: Comparison simulation data of Si4N3 dielectric material(doi: 10.17188/1197656)I. IntroductionSilicon nitride (Si3N4) is a non-metallic compound composed of silicon and nitrogen. This material is interesting because of its durability, electrical insulation, high thermal stability and high acid resistance that widely used in microelectronics and micro-surface machining technologies.The micro-bolometer devices were fabricated at nano and energy center (NEC) of Vietnam national university (VNU) used Si3N4 shut as a supporting layer for the suspending structure and in absorption infrared radiation (IR) packet. The fabrication method used plasma enhanced chemical vapour deposition (PECVD) system that require high vacuum. The optimization of IR absorption packet by experimental is extremely expensive. Thus, the properties of Si3N4 crystal structure need to investigate by simulation and compare to experiment data.

Question 1: In the “Introduction” section (second paragraph), they claim that strong linear absorption in the OPA technique makes this only usable for 2D scanning and the absence of linear absorption in TPA technique and local non-linear absorption makes this technique applicable for 3D scanning. Please explain and elaborate this idea with graph and/or equation.Question 2: In the “Working principle of LOPA microscopy” section, they wrote: “The intensity increases nonlinearly and reaches a maximum value at the focal plane ” (line 2 and 3). Please explain and elaborate this idea with drawing and/or equation.Question 3: In the “Working principle of LOPA microscopy” section, from line 1 to 6 at page 4, they imply that the high absorption of OPA decreases the intensity of light and this is a disadvantage of OPA technique and it hinders the the OPA technique from achieving what the TPA technique can do (being able to give off light with high intensity and get photo induced effect). However, at line 8 to 11 they claimed that the strong linear absorption of OPA technique can also get photo induced effect ? Can you elaborate on this idea ? i think im misunderstanding somethingQuestion 4: In the “Working principle of LOPA microscopy” section, paragraph 2 (from line 12 page 4). They are explaining on how they get low absorption effect with OPA. I don’t understand this at all. Can you explain this with drawing and/or equation ? thank you.Question 5: In the “Working principle of LOPA microscopy” section, paragraph 2, line 7 to 9 they wrote ” Although the absorption is ultra weak, the effective photo induced effect in focusing region is therefore comparable to that obtained by a laser beam with a high absorption effect”. I do not understand this point at all because i thought the whole point of this is making OPA having low absorption like the TPA technique so this OPA technique can do what the TPA technique can too. Why are they speaking of the “high absorption effect” as an advantage now ? What am i misunderstanding

1. Using Equation 4.4, show that d represents the mean distance neutrons travel before being absorbed.25. If you were located 100 km from a 1 GW nuclear power plant, what would the neutrino flux be at your location? Assume that a 1 GW nuclear power plant releases 1021 neutrinos per second and you present a 1 m2 surface to the neutrino flu

1. Use the information in Section 6-1 and write a summary of the Nice model of how the solar system formed. Explain how the solar nebula collapsed, how the protosun formed, how the planetary disk formed, the role of temperature at different locations of the solar system (i.e the snow line & how it relates to what substances were found on either side of it), and the role of collision & accretion in forming the planetesimals. This question is worth up to 10 points.2. Use the information in Section 6-2 to summarize how each of these planets formed: Jupiter, Saturn, Uranus, and Neptune formed. Include information about what they are made of and why, the order in which they formed, and where they formed (5 points)3. Use the information in Section 6-3 to summarize how the inner planets formed. Include information on what they are made of as compared to the outer planets, and where their water came from. (5 points)4. Use the information in Section 6-11 and describe the general pattern of orbital size, planet size, and density across the solar system. Also describe the planetary debris (comets, asteroids, meteoroids) and dwarf planets in our solar system including where we would find them and what they are made of. (5 points)5. Use the information in Section 6-12 and compare/contrast the planets in our solar system to planets in other system in terms of their size/density, masses, orbits, age, etc (5 points)Make sure your answers are focused on what is being asked in each question and that the answers are in-depth with lots of relevant details.