PHYSICS QUESTION for all you science people!
felt like putting up a question for people here who might wanna try their luck at this question. mind you i have the answer and a method (there might be more than one method to reach the answer). so good luck
"Jock is at the Highland Games. He swings a 5.0 kg ball and chain at 80(degrees) to the vertical. The radius of rotation is 1.0metres. Calculate the period."
(sorry for all u guys who use feet or w/e. we use metric system here lol)
May 10, 2011
26 Comments • Newest first
I'll have a go; sorry if a solution has been posted.
Tan(80) = Centripetal Acceleration/Gravitational Acceleration
Thus Centripetal Acceleration is 9.8*Tan(80) = 56 (approximation).
V = a^2/r, so V = 56^2 = 3136m/s. (Holy crap).
Time = Distance/Speed. Distance = 2pir = 2pi.
2pi/3136 = 2 milliseconds.
Either this guy is a juggernaut or I made a mistake somewhere.
My first line, idk where I got it from, lol. Maybe I should consider tension, but too lazy.
Ah kinematics good times.
[quote=kimay]@FirezRage: i hope you do too [/quote]
thanks .
[quote=kimay]@FirezRage: that's so effed up. LOL[/quote]
yeah but i mean its for scholarship physics so i dont expect any easier. hope i pass arghh
The answer is 42.
[quote=kimay]@FirezRage: yeah, physics is interesting. too bad it's a head do-er [/quote]
definitely. u should see some of the questions i get >_>. its like this one i posted except 5x harder..
@Mmaple too easy? is that so?
@kimay i do chem, physics, physical education and english. i like physics cuz all of it can be found in life, like how refrigerators work, how theres a gravitational pull on all of us and etc
@magemaester noooo why did u have to say it
@kimay aww well i quite like physics . i think its my favourite subject out of all the ones i got. pretty interesting stuff i reckon
@LordAriates there is no spring constant involved. it is a ball attached to a chain so there is no extension of a spring, its not SHM. funny that u mention that equation cuz i learned about it today in class lol. turns out i shouldve had that weeks back but the classmate whose notes i copied from didnt have that >_>
Only if Sheldon were here
uuuuuuuuuuuuuuuuuuuuuuuuuuuuuhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh
what?
@kimay: o_o erm this is my 3rd year of physics. my intentions? i guess i plan on going to university with what i know. how bout you?
Yea.... No I'm done with physics. AP Physics exam over .
Edit: You don't involve air resistance in high school level physics. Air resistance is covered in college level physics. T=2pi x square root of theta/I. I think that's the equation your looking for, where I=sigma mr^2.
@kimay: i have to do these kinds of questions at the end of the year. and questions even harder than this arghhhh
Screw Kinetics I'm going over circuits and electricity now. Junction Rule ftw =]
[quote=kimay]i do physics. i don't know why. it hurts my head [/quote]
cuz ur stoopid LOL JK. dw its not a very easy question to grasp. 90% of the issue lies in the comprehension of the question and situation and 10% is calculation. once u understand how to do it its so easy to get the answer. some people are just thinking too deeply into it like which way it swings, air resistance, etc
@bobjones96 there are assumptions u need to make about this situation
@danarutox the thing about this question is that the maths and calculations involved arent that hard, its just the understanding which gets everyone (including me, i didnt get this at first lol)
@kimay there are some assumptions u need to make about this situation such as no air resistance, no friction
@cheongasaur you're somewhat on the right track just some little things that went the wrong way
guuuuuuhh my brain went KAPLOOSH
[quote=KingHippo2]Another metric user, their rare these days[/quote]
You do realize the US is practically the only country which doesn't use the metric system?
@XiaoGao nope u do need the angle. no v=f(lambda) is used for wavelength and this is not one of them.
@Mangofries nope
@iJoonz you're catchin onto somethin but u made a bit of a mistake somewhere
@SaderSader the guy is holdin onto a chain with a ball attached to it and is spinnin it
[quote=ellzzrawrr]OH, OMGOMGOMGOMG, I know! [: It's--
-gets knocked out by that 5kg ball-[/quote]
weakling.
@below yes. u relate weight and centripetal force. lol everyone else is thinkin too deeply into this dont worry at first i was like whaaaaa
OH, OMGOMGOMGOMG, I know! [: It's--
-gets knocked out by that 5kg ball-
Do you use the formula for a conical pendulum?
[quote=rizaruii]Uh, I'm guessing from your problem you're assuming this is an ideal pendulum?
Then the period only depends on the length of the 'string', or the radius of rotation.
w = Sqrt[g/L] = 2*pi*f = 2*pi/T
T=2*pi*Sqrt[L/g] which is around 2 seconds o-o[/quote]
nope. u have to take more than the length of the pendulum into account.
@sellinscrolls nope.
I'm [b]calculating[/b] so its one.
[quote=Hyun]What is this, your homework[/quote]
nope. if u read carefully, you would know that i already have the answer + method. i'm just throwin this out here to see if anyones also able to get the answer.
Too bad I broke my calculator