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modify delete 20474 - from Simeon205 , 13 yrs (Nigeria) - 2019-08-03
Physics - "physics problem"

Please help me solve this question. An abrupt slowdown in concentrated traffic can travel as a pulse,termed a shock wave, along the line of cars, either downstream (in the traffic direction) or upstream, or it can be stationary. Figure 2-25 shows a uniformly spaced line of cars moving at speed v " 25.0 m/s toward a uniformly spaced line of slow cars moving at speed vs " 5.00 m/s. Assume that each faster car adds length L " 12.0 m (car length plus buffer zone) to the line of slow cars when it joins the line,and assume it slows abruptly at the last instant.(a) For what separation distance d between the faster cars does the shock wave remain stationary? If the separation is twice that amount, what are the (b) speed and (c) direction (upstream or downstream) of the shock wave?

modify delete 20411 - from SHAHRUKH PATHAAN60 , 25 yrs (Australia) - 2019-04-02
Physics - "General Studies"

Here I'm ready for all questions
I like physics and Biology
If you have any questions ask to me
I'm a teacher of a school

20411 -
modify delete 20473 - Reply from Simeon205 , 13 yrs (Nigeria) - 2019-08-03

My name is simeon please can you help me solve this question. Compute your average velocity in the following two cases: (a) You walk 73.2 m at a speed of 1.22 m/s and then run 73.2 m at a speed of 3.05 m/s along a straight track.(b) You walk for 1.00 min at a speed of 1.22 m/s and then run for 1.00 min at 3.05 m/s along a straight track.

20411 -
modify delete 20433 - Reply from Julia64 , 13 yrs (Poland) - 2019-05-29

Hi Charles Reiss, how can I help you? I learn this one mounth ago, so I'll be happy learn you.

20411 -
modify delete 20424 - Reply from Charles Reiss252 (England) - 2019-05-21

Hi there, can you please explain to which forms of energy can exist in

modify delete 20393 - from Kaidence44 , 9 yrs (USA) - 2019-03-11
Physics - "😎😎😎"

If anybody else loves since feel free to answer

modify delete 20392 - from Vivienne165 , 16 yrs (Germany) - 2019-03-10
Physics - "Physics"

Hey folks is there anyone else who loves physics too? Feel free to answer:)

modify delete 20340 - from Rishabh 9 , 20 yrs (India) - 2018-12-25
Physics - "Finding buddies"

Hey there, I am rishabh and I am finding buddies to study chemistry. I know English because all my textbooks are in English. Thanks in advance.

modify delete 20314 - from Eminah41 , 16 yrs (Zimbabwe) - 2018-11-11
Physics - "Looking for buddies who are studying Chemistry."

Hey everyone. i'm doing Chemistry in High school.Anyone interested in Chemistru feel free to talk to mr.

20314 -
modify delete 20328 - Reply from Marek34 , 14 yrs (Netherlands) - 2018-12-03

Hey I'm also in high school and I love chemistry so when do you want to talk about it?

modify delete 20309 - from Sezen9 , 16 yrs (United Kingdom) - 2018-11-02
Physics - "Study Buddy?"


I'm currently studying Maths, Further Maths, Chemistry and Physics at A-Level! Anyone studying similar subjects or just has a genuine interest in STEM, don't be afraid to drop a message! :)

20309 -
modify delete 20479 - Reply from Sandali135 , 17 yrs (Sri Lanka) - 2019-08-09

I'm also studying Physics and Chemistry and Biology. Actually they are very enthusiastic subjects.

20309 -
modify delete 20360 - Reply from Sam181 (Germany) - 2019-01-30

Hey, I am interested. :)

20309 -
modify delete 20358 - Reply from Anna57 , 20 yrs (China) - 2019-01-24

Yes,I am a collage student to learn chemistry!!
But I cannot said it in English haaaaa

20309 -
modify delete 20353 - Reply from Emina41 , 15 yrs (Zimbabwe) - 2019-01-17

i'm interested in those subjects too

modify delete 20239 - from Martin178 , 19 yrs (Burkina faso) - 2018-06-16
Physics - "Science process"

I am just looking for people who love science and technology

20239 -
modify delete 20421 - Reply from Nattcha12 , 22 yrs (Thailand) - 2019-05-10

Hello .. I'm interested in science too you can send me an email. If you want ...thanks

modify delete 20228 - from Felicia85 (Vatican) - 2018-06-06
Physics - "SIENSE"


modify delete 20206 - from Minfan83 , 31 yrs (Taiwan) - 2018-04-17
Physics - "PER"

Anyone interested in physics education? I'm going to Washington DC this summer for a conference about physics education research. (kind of nervous.....)

modify delete 20199 - from sasha217 , 17 yrs (england) - 2018-04-02
Physics - "STUDYBUDDY"

Does anyone want to be study buddies? I am doing a level CHEMISTRY and BIOLOGY and we could help eachother :)

20199 -
modify delete 20292 - Reply from Sun155 (China) - 2018-09-22

Hello!You can call me Delis.I am an senior high school student in China.In fact I know a lot about Chemistry and Biology.I am glad to become your friend!

20199 -
modify delete 20277 - Reply from Eric230 , 18 yrs (Spain) - 2018-08-27

Hey! I'm studying a Biochemistry university degree in Spain! We could talk if you want to!

20199 -
modify delete 20263 - Reply from Marvin215 , 13 yrs (GHANA) - 2018-07-09

Marvin is my name.I'm 13 years old.I have hobbies. Such hobbies like;reading,painting and drawing,watching television etc.

20199 -
modify delete 20255 - Reply from Kelvin173 , 28 yrs (Poland) - 2018-07-07


Kelvin here from Poland. We can be study buddies for sure. Kindly email me for more details and it will be worth it. I am an Informatics student in Poland. My email address


modify delete 20176 - from Emilija15 , 19 yrs (Lithuania) - 2018-02-10
Physics - "Physics"

Hello, I am studying physics and would love to find people who are studying the same subject or are at least interested in physics. I will wait for your messages ;)

20176 -
modify delete 20552 - Reply from aldo 187 , 21 yrs (mexico ) - 2019-11-12 >> NEW

Hello, I study aeronautical engineering where physics is the most important thing I would like to talk to you about how physics looks in your countries and how they analyze it
greetings, I wait for your message

20176 -
modify delete 20361 - Reply from Samantha181 (Germany) - 2019-01-30

Hey, I want to study physics later on in my life but I always searched for someone to talk to about it.

We could learn together?

20176 -
modify delete 20273 - Reply from ALI178 , 31 yrs (maroc) - 2018-08-23

I have a degree in physics and now I am preparing a new degree in Applied Math

20176 -
modify delete 20238 - Reply from Martin178 , 19 yrs (Burkina faso) - 2018-06-16

I like physics and chemistry too.Tereby i study in physics field and i will love to be in touch with other physics fans

20176 -
modify delete 20205 - Reply from Minfan83 , 31 yrs (Taiwan) - 2018-04-17

I love physics and the philosophy in it. (Relativity and Quantum Physics are amazing~)

20176 -
modify delete 20180 - Reply from Omar46 , 17 yrs (iran) - 2018-02-15

I am much intrested in Big Bang theory of the universe.
And yeah my field is math and physics with includes science in it to.
I'll be waiting to learn something from you or from someone else.

20176 -
modify delete 20179 - Reply from Maelis233 , 16 yrs (France) - 2018-02-12

Hello ! :) I like physic too more precisely astronomy and the infinitesimal. What fields are you studying ?

modify delete 20158 - from Edith115 , 21 yrs (Haïti) - 2018-01-12
Physics - "éthanol"

Comment maîtriser ce thème facilement ??

20158 -
modify delete 20258 - Reply from Magali94 (France) - 2018-07-07

Salut pour maitriser le sujet qu'est l'éthanol. Il faut savoir pour commencer sa formule :CH3-CH2-OH. ensuite il faut savoir que c'est un liquide incolore, inflammable et miscible comme avec de l'eau par exemple. L’éthanol est un solvant tu peux le retrouver dans les produits cosmétiques. C'est un isomère de l'éther. L'éthanol peut-être créé industriellement ou naturellement (ex : la levure...)
J’espère avoir pu t'aider. ;)

modify delete 20099 - from bichat223 , 20 yrs (france) - 2017-10-30
Physics - "aider moi svp"

calculer le nombres de protoons et dedui en le nombre d electrons et de neutronsd ammoniac et merci beaucoup

modify delete 20027 - from Ziz215 , 16 yrs (Indonesia) - 2017-08-08
Physics - "you and i"

Hi everybody,I love to study scienice and math.almost everytime I study about them. And do not worry about english, I have book about science and math in english, so don't worry , I can talk or explain something about science and math in english fluently,if you want study with me it's okay or we can talk somethinge about it.

20027 -
modify delete 20362 - Reply from Samantha181 (Germany) - 2019-01-30

Hey, I am interested in math and physics, maybe we could learn together or just talk about it?

20027 -
modify delete 20108 - Reply from huanhuan97 , 18 yrs (Chian) - 2017-11-05

Hello, You are good at physics, and I want to learn physics with you in English. It is better for us to communicate with spoken english!

20027 -
modify delete 20074 - Reply from Sarah233 , 12 yrs (Australia) - 2017-09-26

What year are you in?

modify delete 20003 - from Irina222 , 17 yrs (Russia) - 2017-07-24
Physics - "Science and techology"

I'm just looking for people who are interested in sceince and techology :D (it'd be perfect if you're interested in robotics, too)

20003 -
modify delete 20078 - Reply from Allou Michel145 , 16 yrs (cote d ivoire) - 2017-10-04

slt les amis j'aimerai qu'on devient des portes

20003 -
modify delete 20067 - Reply from Prisca158 , 13 yrs (France) - 2017-09-15

Bonjour je m'intéresse beaucoup aux sciences.
Cela me passionne depuis longtemps.
Si tu veux en discuter contacte moi en priver

PS: sait tu parler français, si oui répond moi en français.

20003 -
modify delete 20041 - Reply from Vincent0 , 15 yrs (Kenya) - 2017-08-19

I've a problem with Albert Einstein's relativity theory

20003 -
modify delete 20014 - Reply from Ishwarya151 , 18 yrs (India) - 2017-08-02

Hey Irina. I have been wanting to find someone who shares my interest in robotics and artificial intelligence for forever now. So I feel like I can sleep more in peace at night after having 'kind of' met you(over dramatic, I know).
Hence here is to hoping we can build our friendship on our love for science and technology(robotics especially). Looking forward to talking to you!!

modify delete 19983 - from faith167 (Kenya ) - 2017-06-21
Physics - "Need help in balancing chemical equations."

I really need help in balancing chemical equations. Also writing ionic equations in preparation ofsalts. I

19983 -
modify delete 20114 - Reply from robin54 , 40 yrs (USA) - 2017-11-15

Please post your equation. Let's check if I can solve it.

19983 -
modify delete 19985 - Reply from jackson26 , 17 yrs (tanzania) - 2017-06-25

bring your equation,(.......) eg.NaOH+HCl-NaCl+H2O

modify delete 19954 - from Srikanth49 , 30 yrs (India) - 2017-05-26
Physics - "I am an Expert in Electromagnetism"

You want to know some simple things in Electromagnetism, you are welcome to ask me doubt, In theory and simple problems. I dont deal with relativity and I am an electronics engineer doing PhD. My area is ultrasonics.

modify delete 19892 - from Arki218 , 13 yrs (UK) - 2017-03-17
Physics - "S,p,d,f orbitals"

I am 13 but really interested in chemistry and physics. Our chemistry classes are a bit slow for me so I tend to read ahead but when I came across the s,p,d and f orbitals I was a little puzzled. Right now we are learning about the periodic table and I was curious, when are the d orbitals filled? I read that in some cases the electron valence changes and was wondering under which circumstances the third shell can allow 18 electrons? I will be very grateful for any kind of help :)

19892 -
modify delete 19904 - Reply from Maria211 , 25 yrs (Venezuela) - 2017-03-29

Now, when can a metallic atom host 18 electrons? When it forms "coordinated" bonds with "ligands". These bonds are a different type of bond. They aren't covalent or ionic. It's a way of sharing electrons through the "d" orbitals of the metals, that is, the metal "accept" the electrons of the ligand, forming "complexes". These complexes can have certain geometrical structures, that depend of the metal and the ligands nature. So, sometimes, they form complexes in with the metal has a total of 18 electros (counting it's s and p electrons).
Good luck!

19892 -
modify delete 19903 - Reply from Maria211 , 25 yrs (Venezuela) - 2017-03-29

Hello :) I hope I'm able to help you. The periodic table has different sections: metals, metalois and no-metals. The metals (the one we're interested in) are separated in three groups, one of those groups is called transition metals. Those metals are the ones that can extend their shell to accept up to 18 electrons. Why it happens? If you're interested I can tell you about it in another post. So, now, how can the metals extand their shell? Well, it is because the transition metals have "d" orbitals in which the extra electrons can be located. See this:

A metallic atom has s orbitals (2 electrons), p orbitals (6 electrons), d orbitals (10 electrons), in total, there are the 18 electrons ^_^

modify delete 19849 - from Alyssa174 , 10 yrs (France) - 2017-02-22
Physics - "chimie,science et construction"

la construction,la chimie et la science j'adore ça parce que j'ai toujours aimer ça c'est trop bien les experience!

19849 -
modify delete 20079 - Reply from Aidan7 , 9 yrs (United States) - 2017-10-06

hi mi name is aidan

19849 -
modify delete 19978 - Reply from anthony29 (France) - 2017-06-14

moi aussi j'adore l'electricitée les experciences TOUT

modify delete 19840 - from Vincent239 (France) - 2017-02-18
Physics - "Theory of relativity/Universe/Multiverses"

Hi! Would someone be interested in debating about our world ? I mean, I'd like to argue about how do you imagine about our universe and all of that :)

19840 -
modify delete 19998 - Reply from Bugra209 , 13 yrs (TURKEY) - 2017-07-13

Hi I think all the human history periot is just a second in cosmic time. So after a cosmic second there will be no life in the world as we know.

19840 -
modify delete 19949 - Reply from axi54 , 16 yrs (Greece) - 2017-05-22

yes absolutely

19840 -
modify delete 19946 - Reply from Denis246 , 17 yrs (Indonesia) - 2017-05-18

I also want debating about that. If you want I will debate with you

19840 -
modify delete 19847 - Reply from Camille216 (France) - 2017-02-20

Hi !
I'm crazy about science of the universe and want to speak about this with other people.
You can send me a message !

modify delete 19804 - from karan67 , 17 yrs (india) - 2017-01-13
Physics - "help"

hey, every one physics is my favourite subject. if you have any problem, you asked me.

modify delete 19777 - from Sofia125 , 11 yrs (Trinidad and Tobago) - 2016-12-14
Physics - "I might be 11 but I know some Science."

I might be 11 but I know some things about science. Not just General or Agricultural. I mean Chemistry and Physics. Since everyone in my family took or is taking the Physics/Chemistry Course I picked up some lessons from them.
I can also help with English :P ^^
I have taken extra lessons in Language Arts, so I would think my vocabulary is of high standard. Not saying I'm the best though...

19777 -
modify delete 19779 - Reply from Sofia125 , 11 yrs (Trinidad and Tobago) - 2016-12-15

Thanks ^^ I will.

19777 -
modify delete 19778 - Reply from Altol51 , 17 yrs (S.Korea) - 2016-12-15

Hi Sofia:) Wow!! All of your familiy members are now in Physics/Chem course?? That's nice!! I'm studying for university enrollment(Have you heard of KAIST? It's quite famous in Korea) and I wanna major in chemistry. If you have some questions to me, please feel free to ask!! I'll try my best to answer it:D

modify delete 19755 - from sallqy86 , 16 yrs (China) - 2016-11-18
Physics - "physics"

Hi.I am sallqy. I am weak at physics.😭 Could someone help me.
I'm looking forward to your reply.

19755 -
modify delete 20293 - Reply from Sun155 (China) - 2018-09-22

Nice to meet you!I am an senior high school student in China.May I can help you to improve your physics level(For example,I know a lot on Mechanics,Thermodynamics)

19755 -
modify delete 20144 - Reply from Lola170 , 15 yrs (Argentina ) - 2017-12-17

I’m studying chemistry and physics, if You need help with them, feel free to contact me!

modify delete 19747 - from Linda127 , 13 yrs (USA) - 2016-11-14
Physics - "Physics"

I may be young but when I grow up I want to be a physicist.If their is anything I could do to help me prepare for that then feel free to tell me.

modify delete 19737 - from Lola244 , 16 yrs (Hong Kong) - 2016-11-05
Physics - "Can somebody help me in physics?"

Hi!I am close to my exams and I hope somebody could help me with my physics,because I am very weak at it (TAT) It's okay if you are not very good, it helps a lot enen if you could teach me a little about it. Thanks!

19737 -
modify delete 19950 - Reply from axi54 , 16 yrs (Greece) - 2017-05-22


modify delete 19629 - from abdo132 , 24 yrs (maroc) - 2016-07-22
Physics - "salut à tous"

Je suis un étudiant en master chimie à la faculté des sciences à rabat (maroc )...

modify delete 19547 - from Sandy226 (India) - 2016-05-07
Physics - "Please, help me in physics......"

Hi! I'm going to university this year, I want some help in learning physics.
I'm really a lot weak in it..... but I want to major it 'cuz I like it....
I need a penpal whose good in it...

19547 -
modify delete 19988 - Reply from Gursafal90 , 18 yrs (India) - 2017-07-03

I could help you

modify delete 19504 - from Connor158 (Great Britain) - 2016-03-12
Physics - "Chemistry"

For those in the UK, Im doing GCSE Chemistry, I have a deep interest in Chemistry and Physics. Can anyone Help me with Balancing Chemical Equations?

19504 -
modify delete 19696 - Reply from Alex9 , 14 yrs (Britain) - 2016-09-19

Hello i just saw your post... i may only be 14 but i madly love doing chemistry equations and trying to balance them, im always just a email away if you would like me to help you, i do triple science so yea

19504 -
modify delete 19540 - Reply from Τ13 (Öйú) - 2016-04-30

l am a student in senior high school.l like Chemistry and Physics too.We can learn together

modify delete 19480 - from yan72 , 24 yrs (China) - 2016-02-26
Physics - "Find friends"

Hello everyone,I am from China.My major is Inorganic Chemistry. Now, I 'm studying for a master's degree.So,I hope to become friends with you,and common learn each other.

19480 -
modify delete 19496 - Reply from Janaiya77 , 9 yrs (USA) - 2016-03-08

I love science What is like there????. I like to visit China some time

modify delete 19448 - from anahita122 , 9 yrs (texas) - 2016-01-24
Physics - "Please teach me Physics!"

i want to learn Physics, because i'm going to move to Germany soon, i don't want to go to school there. My dad says if i pass the GED, i don't have to go to school.

Please help me!

19448 -
modify delete 19510 - Reply from Pavel33 , 16 yrs (Russia) - 2016-03-21

Oh, sorry, *cheat notes

19448 -
modify delete 19509 - Reply from Pavel33 , 16 yrs (Russia) - 2016-03-21

Hey, Anahita!
U can use heat notes for explame. Also u can find many articles on WikiHow about exam preparation and study of the whole.
Good luck, Anahita, i hope u can move to Germany school.

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