Recent content by 121910marj

Dear all, Me and my friends are arguing how many significant figures does 0.0 and 0.0000 have? Me and my other friend say it does not have any significant figure and the others say it's 1 significant number and exact, a special case. Please advise for the correct one. Thanks!

Thank you very much for all your help. Especially, DocAI, the PF mentor & NascentOxygen.. Thanks so much! :))

Yes, thank you. But my concern is about the average velocity.. if the track is circular would that mean that average velocity is 0 m/s.

Hi guys, sorry because I am quite confused. If a person runs a quartermile circular race track for 8 laps for 25.0 min, what is the average speed? What is the average velocity? Does that mean that the average velocity is zero m/s? Because the runner ends on the point where he started...

thank you all for the replies, very well appreciated. :)

Here's the story, me and my boyfriend share things we learned from attending seminars. He told me that a speaker in one of the seminars he attended last month told them that by rubbing our two hands together, we could experience the presence of 'plasma' - the fourth state of matter. Here's...

I do not want you to be pessimistic about it but it's the story about me being frustrated to be a singer but no matter i try, i really sound awful. Anyways, you can always hope and try as you can. =)

I think no. the torsion pendulum has a disk suspended to its end that rotates on its vertical axis (the string where it is attached) while the one fixed to a sphere as you say (simple pendulum) swings from side to side (left-right/right-left manner).. :))

DaleSpam & Pengwuino, Thanks, it's all clear to me now.. :))

I got confused.. XD "Under Einstein's theory of relativity, an object accelerated close to the speed of light gains a tremendous amount of mass.That is why no amount of energy can suffice to accelerate any object, even an elementary particle, to the speed of light - it becomes infinitely...

that's easy.. you're online, so you can browse about it first using the internet. :)) Getting the 'right' answer is important, but understanding how to solve the problem is just as important, if not more so..#physicsforums

three dimensions are length, width and height.. the forth dimension is TIME. we all ready are in a 4-dimensional universe.. :)) you may browse more info by reading relativity.. :))

FREQUENCY of SOUND WAVES The farther you are from the source the lesser the frequency of sound waves your ears absorb,so the lower/softer the sound as perceived by the ears. On the other hand, the nearer you are from the source, the greater the frequency, the more sound waves our ears absorb...

yes. the energy added is used only to change its phase from solid to liquid but not used to raise its temperature from 0*C. Same thing goes when you vaporize water at let's say 110*C, you add heat to change its phase from liquid to gas at constant temperature. :)

how would you like to give the specific problem? but just a reminder,we are not allowed to post assignments here. doing it your way first will deliver you to close answer. start the computation so everyone could help you in some parts, but not totally, get me?