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Physics help - Page 2

Blogs > Ftrunkz
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evanthebouncy!
Profile Blog Joined June 2006
United States12796 Posts
Last Edited: 2009-11-06 04:06:49
November 06 2009 04:06 GMT
#21
equilibrium so basically
sum all force, 0

forces will be gravity and charge and helium_floating and tension
break tension force on string into 2 parts, horizontal and vertical.


Sooo

Oh the left helium baloon:
4 forces:
1) baloon floating up
2) tension from string pulling down
3) tension from string pulling right
4) electricStatic force pushing right
They sum to 0

On the right balloon
1) same
2) same
3) same but left
4) same but right
They sum to 0

On the mass
1) tension of 2 strings combined, upward
2) Tension of left string going left
3) Tension of right string going right
notice 2,3, cancle
4) Gravity going down
They sum to 0

Unknowns are charge force, helium floating force, rope tension force. 3 unknowns, and you have 3+ equations.
Solve.
Life is run, it is dance, it is fast, passionate and BAM!, you dance and sing and booze while you can for now is the time and time is mine. Smile and laugh when still can for now is the time and soon you die!
SanguineToss
Profile Blog Joined August 2009
Canada815 Posts
November 06 2009 04:13 GMT
#22
evan are u a teacher?
StorrZerg
Profile Blog Joined February 2008
United States13919 Posts
November 06 2009 04:13 GMT
#23
Good luck with the test mate, your in physics c? right?
Hwaseung Oz fan for life. Swing out, always swing out.
gyth
Profile Blog Joined September 2009
657 Posts
November 06 2009 04:20 GMT
#24
I think we've agreed on the correct way to solve the problem.
We just don't know why the solution is wrong.
The plural of anecdote is not data.
Ftrunkz
Profile Blog Joined April 2007
Australia2474 Posts
Last Edited: 2009-11-06 04:25:55
November 06 2009 04:24 GMT
#25
On November 06 2009 13:13 StorrZerg wrote:
Good luck with the test mate, your in physics c? right?

umm, first year second semster physics, it's called "Physics 2: Physical Science & Technology" lol. It's just the standard second semestre physics subject at my uni (otherones are like biological physics and advanced).

edit: re-reading the problem, it says the weight at the bottom "weighs" 5g... not that it's "mass" is 5g... could this be our source of error? (ie, force should be 5*9.8, not 0.005*9.8?)
@NvPinder on twitter | Member of Gamecom Nv | http://www.clan-ta.com | http://www.youtube.com/user/ftrunkz | http://www.twitchtv.com/xghpinder
micronesia
Profile Blog Joined July 2006
United States24650 Posts
November 06 2009 04:49 GMT
#26
On November 06 2009 13:24 Ftrunkz wrote:
edit: re-reading the problem, it says the weight at the bottom "weighs" 5g... not that it's "mass" is 5g... could this be our source of error? (ie, force should be 5*9.8, not 0.005*9.8?)

Eh, you can try substituting in the new number and see what you get but, that would be an incredibly stupid thing to do...
ModeratorThere are animal crackers for people and there are people crackers for animals.
evanthebouncy!
Profile Blog Joined June 2006
United States12796 Posts
November 06 2009 05:07 GMT
#27
On November 06 2009 13:13 SanguineToss wrote:
evan are u a teacher?

nope but I tutor math, or used to.
Life is run, it is dance, it is fast, passionate and BAM!, you dance and sing and booze while you can for now is the time and time is mine. Smile and laugh when still can for now is the time and soon you die!
Hiphopapotamus
Profile Joined July 2009
United States121 Posts
November 06 2009 06:32 GMT
#28
Yeah, I also get Q = 5.55 * 10^-7 using the below three equations...

arcsin(a) = 30/100

mg = 2Tcos(a)

Tsin(a) = kQQ/r^2
My lyrics are bottomless!
gyth
Profile Blog Joined September 2009
657 Posts
November 06 2009 06:34 GMT
#29
They used 60/(100*100) for r^2.
If it wasn't your teacher that made the mistake you might be able to wiggle some bonus out of it.
The plural of anecdote is not data.
GTR
Profile Blog Joined September 2004
51418 Posts
November 06 2009 06:35 GMT
#30
i'm so happy i dropped physics for my hsc, it's just nothing but maths and theory =[
Commentator
Divinek
Profile Blog Joined November 2006
Canada4045 Posts
November 06 2009 10:36 GMT
#31
On November 06 2009 15:35 GTR wrote:
i'm so happy i dropped physics for my hsc, it's just nothing but maths and theory =[


Which is what's so wonderful about it!
Never attribute to malice that which can be adequately explained by stupidity.
Oh goodness me, FOX tv where do you get your sight? Can't you keep track, the puck is black. That's why the ice is white.
micronesia
Profile Blog Joined July 2006
United States24650 Posts
November 06 2009 11:53 GMT
#32
On November 06 2009 15:35 GTR wrote:
i'm so happy i dropped physics for my hsc, it's just nothing but maths and theory =[

This is so wrong!
ModeratorThere are animal crackers for people and there are people crackers for animals.
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