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Physics question
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PostPosted: Mon Oct 09, 2006 10:35 pm    Post subject:  
buttersdan wrote:
Two objects A and B accelerate from rest with the same constant acceleration. Object A accelerates twice as long as object B. Which statement is true concerning these objects at the end of their respective periods of acceleration?

a. Object A will travel twice as far as object B.
b. Object A will travel four times as far as object B.
c. Object A will travel eight times further than object B.
d. Object A will be moving four times faster than object B.
e. Object A will be moving eight times faster than object B.



buttersdan wrote:
A trucker drives with an average velocity of 27 m/s toward the east on a perfectly straight highway. What will the trucker's displacement be after 2 hours?
a. 97 km to the east
b. 190 km to the east
c. 1600 km to the east
d. 3200 km to the east



NightWish wrote:
How many calories does it take to heat 50ml of H2O +5 degrees kalvin at room temp (70degrees F).

It's been awhile since I've done thermodynamics (which is physics, not chemistry, ra9e) but is it ~ 580 cal? Could be wrong, been doing work all day and will continue to do so for the next 20 hours or so.
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PostPosted: Tue Oct 10, 2006 12:55 am    Post subject:  
I HAVE JUST BEEN PWNT.

All this stuff sounds familiar though, my girlfriend is a mechanical engineer...
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PostPosted: Tue Oct 10, 2006 8:54 am    Post subject:  
*sits with jaw on the floor* omg im in for hell
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PostPosted: Tue Oct 10, 2006 9:29 am    Post subject:  
lld_newb wrote:
*sits with jaw on the floor* omg im in for hell


Physics is awsome Very Happy, electricity, heat, movment Very Happy design 1500^2 ft house that has low heating bills and does not cost much to construct Very Happy

zomg i love that class, but I love chemistry more!


Whats the potential kenetic energy of a 3cmx5"x1cm object standing on its 3cm side ( with the 1cm side parralel to the edge) on a platorform 5 meters tall. That has a mass of 12g/m^2.

Very Happy comon, figure it out Razz
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PostPosted: Tue Oct 10, 2006 10:40 am    Post subject:  
Quote:
Whats the potential kenetic energy of a 3cmx5"x1cm object standing on its 3cm side ( with the 1cm side parralel to the edge) on a platorform 5 meters tall. That has a mass of 12g/m^2.


what..i...know..is.....potential n kanetic
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B[x]


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PostPosted: Tue Oct 10, 2006 7:50 pm    Post subject:  
NightWish wrote:
Whats the potential kenetic energy of a 3cmx5"x1cm object standing on its 3cm side ( with the 1cm side parralel to the edge) on a platorform 5 meters tall. That has a mass of 12g/m^2.

Very Happy comon, figure it out Razz

I would if it was possible to answer.
1. I've never heard of "potential kinetic", only one or the other. However, based on the problem statement, I'm sure you meant "potential".
2. In BG units, mass is in g (or kg, etc.), not g/m^2. I think you meant to say "density". However, the units of density in BG are mass/volume, not mass/area.

If you're going to pose questions, please make sure that they make sense AND you post an answer for them afterwards -- I'm still waiting on the answer for the thermo problem.
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PostPosted: Wed Oct 11, 2006 10:41 am    Post subject:  
eh, sorry no internet at home. and thanks for a bit o termonolgy correction yea, it was density and you have to convert it into g/cm^2 ill post the answer next monday., sorry for bad termonolgy/grammar, had physics last year lol. and my notes are hard to read (i have bad hand writing) but to answer the calorie question, yes, its around the 550-600 area.
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PostPosted: Wed Oct 11, 2006 8:45 pm    Post subject:  
NightWish wrote:
eh, sorry no internet at home. and thanks for a bit o termonolgy correction yea, it was density and you have to convert it into g/cm^2

You must have glossed over my post. Not only was it a terminology issue, it was also a correction of units. Density is not measured in mass/area, as you seem to be convinced. Please don't tell me that I "have to convert it to g/cm^2" because not only can density not be converted to what you suggested, I can convert it to whatever I want, provided the units are consistent (the units you choose are not).

Aside from all this (I glanced over this before), the dimensions you provide for this rectangular object are in cm as well as in inches. No problem statement nor any situation encountered in real life will give measurements in both BG and SI units.

Another point -- You say this object is resting on its 3cm side. I hate to break it to you, but this object doesn't have a 3cm side; it has a 3cm edge.

In its current jumbled state, this problem cannot be answered, in any way, shape, or form.
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