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modify delete 20856 - from rajesh34 , 15 yrs (india) - 2021-05-27
Physics - "I need help with homework"

is someone smart enough to solve this? i asked my brother ha cant help me...


An athlete throws the hammer at an angle of about 39.95 ° reaching the
distance of 86.74 m. The tool consists of a sphere weighing 7.26 kg and radius
0.06 cm and a chain and a handle for a total length of 1.195 m. The height from
from which the tool started was about 1.7 meters. The total turning radius is 1.95 m.
1. Calculate how fast the hammer was thrown
2. Calculate the angular speed of rotation of the athlete at the moment of the throw.
3. Calculate the centripetal force exerted by the athlete immediately before the release (assuming
a uniform circular motion and neglecting the force of gravity)
4. Write the trajectory equation and draw its graph. Calculate the coordinates of the
point of greatest height.
5. Assuming that once launched, the hammer rotates on itself at the angular speed of
0.2 rounds per second calculate the kinetic energy and potential energy at the point of maximum altitude.
Note: the moment of inertia of the hammer is 0.2 kg * m2


modify delete 20847 - from Andy65 , 14 yrs (China) - 2021-05-06
Physics - "I'd like to know the English translations of some chemistry nouns"

If you're a contemporary from English-speaking countries who have started learning chemistry in your school, please let me know. I have also started learning chemistry (inorganic only) and I'd like to know how everything chemical is called in English.


modify delete 20812 - from Solomon210 , 14 yrs (Uganda) - 2021-03-03
Physics - "pressure in a U tube manometer"

Hi am Solomon, I wish to know if there's some one who can help me calculate pressure in a U tube manometer


20812 -
modify delete 20825 - Reply from yangrunze8 , 15 yrs (China) - 2021-03-20

p=rho gh

modify delete 20811 - from Lasandi231 , 15 yrs (Sri Lanka) - 2021-02-27
Physics - "learning physics"

It's too hard to study equations of physics like acceleration,gravitational acceleration....if u know any easy way or study trick let me know...


20811 -
modify delete 20865 - Reply from Kyle123 , 16 yrs (Canada) - 2021-07-13

I don't think like that. Physics is the easiest among the all branches of science. It's so fun to study it.

modify delete 20796 - from Lasandi157 , 14 yrs (Sri Lanka) - 2021-02-16
Physics - "How to be an research scientist about universe!!!!"

If someone know how to become research scientist in sri lanka let me know...i already search but i do not know find any steps to be followed to become research scientist...what should i learn to become research scientist...


20796 -
modify delete 20805 - Reply from Augustin220 , 14 yrs (France) - 2021-02-20

Hello, to become a researcher in Physical Sciences, you must have a Scientific Bac. Then, you must have at least a Master (Bac +5) in Physics, Chemistry.

modify delete 20745 - from Oneli161 , 13 yrs (sri lanka) - 2021-01-01
Physics - "Aerospace engineer"

Hi! My ambition is to become an Aerospace engineer.i'm choosing physics,Chemistry and combined mathematics as my A/L subjects. I just want to know how much of the periodic table you have to study. I mean it's not like all 118 elements are coming. I also wish to make friends with a girl who works in Caltehc.


20745 -
modify delete 20750 - Reply from Mevindu135 , 20 yrs (Sri lanka) - 2021-01-20

You don't have to remember that.It's unnecessary work.It is given at the exam.And it is automatically remembered when you work for A/l.If you really need it,I have a short method.But it cannot be sent here because it is a picture. So tell me your father's or mother's email address.I'll send it to you.

modify delete 20737 - from amalnee135 , 12 yrs (sri lanka) - 2020-12-18
Physics - "science is brilliant"

I like science because there are many experiments and about animals too. My father is physics teacher then I can learn science easily. There are science in physics too. I like science very much.


modify delete 20685 - from Mevindu135 (Sri lanka) - 2020-08-30
Physics - "I can help you for chemistry or biology"

Im studying Chemistry,physics and biology for my advanced level exams.I can help you for chemistry or biology. I think im very good for those subjects.So anyone need a help feel free to contact me.I will treat you 100% respectful and kindness.Hope you guys are same.


20685 -
modify delete 20749 - Reply from Mevindu135 (Sri lanka) - 2021-01-20

rmevindu@gmail.com

20685 -
modify delete 20748 - Reply from Moses210 (Uganda) - 2021-01-13

Send me your email address for further inquiry

modify delete 20665 - from Charlotte218 , 15 yrs (United States) - 2020-07-20
Physics - "Stuck on my Summer work, SOS"

I am having trouble with a problem on my summer work.
it is this:
A block of mass m is hanging by two strings of negligible mass as shown in the figure. String 1 is at an angle of 60∘ with the horizontal and string 2 at an angle of 45∘ with respect to the horizontal. Find the magnitude of the force of tension in strings 1 and 2. Express your answers in terms of m and g


modify delete 20583 - from Beara229 , 16 yrs (China) - 2020-03-05
Physics - "Hello"

hello. I am Beara ,a senior High school student from China. I think chemistry and physics. I hope someone who good at that. can help me. please. My English is not very good ,and I think whenI ask u some questions I can practice my Rnglish. ,too. And I hope to know the student all over the world how you study. :)If u can.,I hoe u can send mail to me. And we can talk about studying,too. :D


20583 -
modify delete 20684 - Reply from Mevindu135 (Sri lanka) - 2020-08-30

I can help you for chemistry

20583 -
modify delete 20597 - Reply from Sanu245 (Sri Lanka) - 2020-03-27

Hi! I'm also searching for soeone who is interested in physics. We'll work together.

modify delete 20561 - from Andrew113 , 13 yrs (United States) - 2019-12-19
Physics - "Hess' Law Question: Chemistry"

Hello, I had my AP Chemistry midterm recently, and there was one question that seemed actually impossible. It probably isn't, and I wanted to see if any of you could solve it. (It seemed like it was impossible to combine the two last equations into the first.) This is the question.

Use Hess' Law to calculate the enthalpy of this reaction in kJ/mol:
4PCl3 => P4 + 6Cl2

Use these two equations and their respective enthalpies:
4PCl5 => P4 + 10Cl2 (1528 kJ/mol)
PCl3 + Cl2 => PCl5 (-111 kJ/mol)


20561 -
modify delete 20683 - Reply from Mevindu135 (Sri lanka) - 2020-08-30

very easy. 1084 KJ/mol

modify delete 20557 - from riemann64 , 100 yrs (germany) - 2019-11-24
Physics - "Riemann hypothesis"

Hello everyone i search a man or a woman who has resolve the Riemann hypothesis because that very important !

:D


20557 -
modify delete 20703 - Reply from Luna202 , 16 yrs (France) - 2020-10-14

Hi, if you found this person, then tell me how he did ! :D

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 20558 - Reply from riemann64 , 100 yrs (germany) - 2019-11-24

hello could you help me how to resolve a bilan of energy with the equation of conservation ?

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:)


20392 -
modify delete 20786 - Reply from ­Zåû20 , 15 yrs (China) - 2021-02-05

Ilove physics!My dream major is closely connected to Physics and I'm working hard for it.

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.
Regards


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 20579 - Reply from Chetan Arya47 , 17 yrs (India) - 2020-02-23

I do care of ot.Maybe you can be my future assistant for DixTec.in. Hope to see you and some other guys there.

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?"

Hi,

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

Hey
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"

SIENSE ISS FUNN ANND MAKS TINGS EXPLOD.


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

Hello,

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 prowrite247@gmail.com

Cheers

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

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."

Hi.
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"

Hey,
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 :)


















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