# Arnav

Senior Members

38

1. ## Friction

Maximum magnitude of F₂ = μ₂N₂ = 1.5g Maximum magnitude of F₁ = μ₁N₁ = 0.4g yeah i understand However, in a single case, lets say 10 N force is applied on block 2, i would be having 3 FBDs, each corresponding to one of the blocks, which would give me 3 equations involving five variables, f₁ and f₂ (as i dont know if they are limiting or not, and f₃ will always be zero as the friction coefficient is zero so not counting that) and the accelerations of the three blocks a₁,a₂,a₃. I am confused how i go on after that. I obviously need at least the same number of equations as the number of variables.
2. ## Molecular orbital theory

Yo man you just cleared my head completely! Thanks! I really confused whether to give up the principles of VBT while studying MOT or not, but thanks to you it's clear now Will definitely check the website
3. ## Friction Question 2

here is the rest of the 5th question, the correct answer is given as the 4th option i think by equilibrium the author means to ask whether the force force F on itself,alone, will it be able to keep the blocks in equilibrium?
4. ## Friction

Here is what I have done so far I am getting 3 equations and 4 variables. When i see a solution of this question, it is said that blocks 1 and 2 will not move relative to each other as well. I dont get how i can conclude that f₁ and f₂ will be such that all three blocks are not in relative motion. Do i take into account the self adjustable nature of friction? or am i missing something else?
5. ## Friction Question 2

@studiot do you mean that the magnitude of coefficient of friction, the weight of the blocks is not given? or is the question incorrect?
6. ## Friction

I tried to, but i could not come to the conclusion whether the friction between block b and c will be able to restrict their relative motion or not
7. ## Friction

How do I do the part b and c of this question (23)? Any hints? One part of me says that in part b, the max friction between the 3 kg and 7 kg block is 15 N, so there will be no relative motion between them. What about 2kg and 3 kg block?
8. ## Friction Question 2

I am having trouble understanding this question. The questions asks the direction of friction. The correct answer is the is that the system cannot remain in equilibrium. One more question is that if the friction coefficient between A and the wall had not been zero what would have been the direction of friction due to A on B then?
9. ## Molecular orbital theory

A basic doubt in molecular orbital theory. While writing the electronic configuration of molecular orbital, for example say of Fluorine molecule, which forms a single sigma bond between sp3 orbitals, we start the configuration with sigma1s² orbital. Does this mean molecular orbital theory considers that when atoms combine, all of their orbitals are fused? Even the ones not participating in the bond? Or does it consider that the bond between atoms is not just a result of the bond between valence orbitals, but all of the orbitals of combining atoms? I have only been introduced to this theory qualitatively, so the questions may seem a bit weird.
10. ## Ice - smaller steps vs longer steps

A question in a very famous physics book in my region is as follows: While walking on ice, one should take small steps to avoid slipping. This is because smaller steps ensure: a) larger friction b) smaller friction c) larger normal force d) smaller normal force This is a single correct multiple choice question. Contrary to common idea, which is that smaller steps would give you more friction, the book states the opposite, smaller steps would give smaller friction!? So as per my reasoning, in both the cases, the normal force would be the same, equal to mg, where m is the mass of the person, to maintain vertical equilibrium, so options 3 & 4 are incorrect. Now while taking smaller steps, the impending motion of either of the person's feet relative to the ice is very low, as compared to the impending motion of the feet relative to ice in the case of larger steps, which should be more, so that gives lesser friction in smaller steps( less than the limiting friction), giving the 2nd option as correct. Is my reasoning correct?
11. ## Representative elements, Why this name?

Many indian books have that term...not under the topic of historical development of periodic table, rather under the topic modern periodic table and the broad classification of elements in it. They state that s,p blocks are called representative elements and don't give any reason

Oh nice 🙂
13. ## Representative elements, Why this name?

okay thanks guys. I dont know why the books in our education system still use the old terminology like representative elements😬
14. ## Representative elements, Why this name?

I believe you misinterpreted my question, in which I asked about representative elements,(entire s-block and p-block except noble gases) while you, I believe, are talking about typical elements, the elements of period 3.
15. ## Representative elements, Why this name?

Why are representative called so? If I google it, the majority of people state its because their outermost energy levels are not completely filled. But isn't it absurd to name them "representative elements" then? what is the logical reason behind it?
16. ## Electron Probability distribution

Thank you studiot. It really helped Thank you for giving such an in depth explanation 👍
17. ## Electron Probability distribution

Yes I have Could you please explain hyperfine splitting?
18. ## Electron Probability distribution

Well I am a grade 11 student, studying these concepts for the first time,so I only have an abstract idea of it. What I posted was just a picture from the internet about the graphs What I wanted to know was how come the electron probability density is maximum at the nucleus!? How come as I go closer to the nucleus, the probability of finding an electron at a given point(or small cubic volume dV) gets bigger and bigger? And is greatest at the nucleus!? Is is just mathematical? How come the electron probability density is defined at the nucleus? Where there is no volume itself!? I might have said some extremely wrong things in this last paragraph, so excuse me😅, analogies would work best for me as an explanation
19. ## Probability of finding an electron at a great distance from nucleus

okay thanks for the answer swansont
20. ## Electron Probability distribution

Please note that I mentioned electron probability density in my question, not radial electron probability distribution. What I want to convey is, why is graph(b) maximum at the nucleus? I understand how the actual probability is obtained by multiplying electron probability density at certain r by 4pir².dr What I want too understand is why the graph of Ψ² vs r peaks at r = 0. Does it have any physical significance? please bear with me if i missed something
21. ## Probability of finding an electron at a great distance from nucleus

I recently learnt that according to quantum mechanics, the probability of finding an electron anywhere(except nodes) is non zero. The probability of finding the electron of the sodium atom in my vapour lamp, in Andromeda galaxy is, although very very small, but non zero. I am unable to wrap my head around this fact. Is the aforesaid statement just a mathematical consequence? Could someone please explain this to me? P.S. I am a high school student, so it would be extremely good if someone could explain this to me in layman terms
22. ## Electron Probability distribution

I was recently reading about atomic structure's journey, when i saw the electron probability distribution graphs for some orbitals. Why is the electron probability density maximum "at the nucleus" for s subshell ? does it have any physical significance? the confusing part for me is that the probability of finding an electron would be the least at nucleus, so how come probability density is maximum? P.S. I am a high school student, so it would be extremely good if someone could explain this to me in a simple way
23. ## Finding the range of a function

could you please elaborate? I have not studied about continuity and discontinuity yet.
24. ## Millikan's oil drop experiment

Thank you studiot for the in depth explanation
25. ## Millikan's oil drop experiment

Could you please elaborate what do u mean by "charge"? I mean, are u refering to "kind of charge(+ or -) on the droplets"? One of my ideas is this: The oil droplets caught both - and + charges,(some caught only -, some only +, while some both). Millikan knew how he had arranged the electrodes in the apparatus and how positive and negative charges would interact with them. If the charge on a droplet was net +, it would accelerate down when Electric field strength was increased while it would decelerate if it had net - charge. If it was neutral, there would be no effect. So, Millikan could determine the kind of charge on the droplet just by observing the effect of changing electric field on its vertical speed. Could the situation have been like this? Do you mean that he discovered that the charge was negative on every droplet? If so, why no + charge was found?
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