# Search results

1. ### B Is the formation of galaxy groups explained correctly here?

Thank you for the explanation.
2. ### B Is the formation of galaxy groups explained correctly here?

Thank you for the answer. :smile: Can you please explain how quantum fluctuations affected the distribution of matter? (I assume you were referring to the distribution of mass in space with your use of the phrase "...different densities in different regions...")
3. ### B Is the formation of galaxy groups explained correctly here?

Hello! I watched a video on the Youtube channel Kurzgesagt titled How far can we go? Limits of humanity The video attempts to explain why we may be limited to our local galaxy group even with science fiction technologies. During a part of the video (starting at 2:26), they try to explain how...
4. ### UG EE. Anything valuable I can learn this summer?

So any small, one man projects/hacks or anything that I might be able to work on and learn through experience? So far I have studied the following courses that might be somewhat directly applicable (other than the basic sciences and math): 1. Programming (OOP and basic Data structures and...
5. ### UG EE. Anything valuable I can learn this summer?

Hello. :) I am an undergrad EE student at the end of my fourth semester. I have to take a couple of courses in the summer semester to improve them. So a full time internship might not be possible. Are there any small things I can learn along the way in the summer, on my own? Any new software...
6. ### Logic Design: Interpreting entering and leaving a room.

No. Haven't studied any synchronizer circuit or their uses.
7. ### Logic Design: Interpreting entering and leaving a room.

What is the "wait" operation? Staying in the same state if the inputs from the IR receivers remain unchanged? Or is it something more complicated? For the sequence detector to wait if nothing changes is exactly what I think I need.
8. ### Logic Design: Interpreting entering and leaving a room.

What I meant to say was that each sequence detector would be looking for a particular sequence. One sequence detector would output '1' for incrementing the counter when the input sequence for entering is detected. (lets say it would be 00->01->11->10->00), while the other does the opposite for...
9. ### Logic Design: Interpreting entering and leaving a room.

Homework Statement Hello. We have been given a project in our course "Digital Logic Design", which is an introductory course to Digital Logic. We are only allowed to use gates, multiplexers, flip-flops/latches, counters, comparators, simple displays (like seven segments) etc. I am making...
10. ### Studying Popular science books, science documentaries bad?

I went through someone's thread asking regarding a popular science book, a considerable time ago. I got the impression that the more knowledgeable members in the discussion did not approve of most popular science books (if my memory serves me right the point mainly was that it gave people the...
11. ### The term: New Math

Are the wikipedia articles about long and short division accurate? There isn't much different in the two methods they show.
12. ### Meet a Mentor: berkeman

Good one. Sort of inspirational. Can relate myself to more than one part. Was confused between physics and EE (although my physics never was very good). Now doing EE and the first year so far (in 2nd semester) has been very bad. Hope I can pull it off nicely from here onward like berkeman did. :)
13. ### Mgh at infinity.

So mgh is fundamentally incorrect and it only works in a particular case? And the g.p. energy actually does keep increasing the farther the body goes?
14. ### Mgh at infinity.

According to the eq. U=mgh the gravitational potential energy should keep increasing with height. But it actually reaches zero at infinity. At what point does the g.p energy start decreasing when going away from earth? Why does this eq. seem to contradict -GMm/r where g.p energy decreases with...
15. ### Range of quadratic equation.

Thanks a lot genericusername. :smile:. That cleared it up.
16. ### Range of quadratic equation.

Just a couple of questions to clear it up. When all the three possibilities were tried, how should I have known that the answer I got by y-4<0 one of the two intervals? And can I find the second interval that I had found in my original solution using this method?
17. ### Range of quadratic equation.

y ≤ 0. :smile: Thank you.
18. ### Range of quadratic equation.

y-4 = 0 => y=4 y-4 > 0 => y>4 y-4 < 0 => y<4? Still I don't get you. I take the three different possible cases. What do I do with them? Do I have to check each to see which are correct? Or somehow use them to get y ≤ 0?
19. ### Range of quadratic equation.

Do you mean this is the way to do it?? y2-4y ≥ 0 y(y-4) ≥ 0 ---------(i) multiply both sides by '-1' -(y-4)y ≤ 0 divide both sides by -(y-4) y≤0?
20. ### Range of quadratic equation.

-a≥-b? But isn't that because we multiplied '-' on both sides of the inequality?? :confused:
21. ### Range of quadratic equation.

I don't get what you're trying to say. What I mean is that along with y-4 ≥ 0, there is another interval for values of range which is supposed to be y ≤ 0. How do I get that?
22. ### Range of quadratic equation.

Homework Statement The following equation defines a rational function.Find its Range f(x) = x2/(x-1) The attempt at a solution Let y = x2/(x-1) =>y(x-1) = x2 =>xy-y = x2 =>x2-xy+y = 0 comparing with the general form of quadratic equation ax2+bx+c = 0, a=1, b=-y, c=y...
23. ### Compton effect and Photoelectric effect explained by wave theory?

I'm sorry I might have given wrong impression about my education level. I use the HRK for extra knowledge that I find interesting in my high school physics. I am actually only a high school student.
24. ### Compton effect and Photoelectric effect explained by wave theory?

I have the fifth edition of 'Physics' by Halliday, Resnick and Krane. In the chapter 'The Nature of Light' it is stated that it is possible to explain both photoelectric effect and Compton effect in classical electromagnetic wave theory and this has been known since 1927. It says that...
25. ### Confused about time dilation. (Just got introduced to relativity))

Found this. Maybe it'll be helpful to someone. http://www.walter-fendt.de/ph14e/timedilation.htm
26. ### Confused about time dilation. (Just got introduced to relativity))

Our physics textbooks have had errors in the past. The whole time dilation section appears wrong to me now except for the rearranged equation you explained. Thanks for clearing it up. You helped me a lot.
27. ### Confused about time dilation. (Just got introduced to relativity))

1- How does the equation change for both cases? Here is the exact paragraph from of the textbook, Can you please clarify this with that Ted and Alice example? And what is t?
28. ### Confused about time dilation. (Just got introduced to relativity))

So for example if Ted's clocks measure 10 seconds, as Alice moved between those two clocks, he will see Alice's clock to have measured e.g 4, 5 or 6 seconds.(I mean less than his 10s). But the equation in my textbook is t = to/√(1-v2/c2) Where to is the...
29. ### Confused about time dilation. (Just got introduced to relativity))

Sorry bobc. Most of it passed over my head. And I don't see how it answers my straight forward question.
30. ### Confused about time dilation. (Just got introduced to relativity))

Another small confusion/question related to time dilation which I think doesn't need a thread of its own. :smile: When we say a moving clock ticks slower, does it mean it will count less number of seconds than a stationary clock? e.g 5s in my stationary clock , I'll observe less than 5s in a...