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Transdude1996
Post #585740 - Reply to (#585739) by neonkitty
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1:33 am, Jan 31 2013
Posts: 350


Here is the unit conversion if that is what your looking for.

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007demosthenes
Post #585741 - Reply to (#585739) by neonkitty
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1:38 am, Jan 31 2013
Posts: 71


Quote from neonkitty
Everything went well. I got a 40/40. bigrazz
- - - - - - - - - - - -
Biology Lab homework help. ~_~"


Head CT Scan (2 mSv)
Airplane flight from New York to LA (40 µsv)

Radiation exposure of 4 Sv can be lethal.
REMEMBER YOUR METRICS PREFIXES!!

22. How many airplane flights from ...

Hit me if I'm wrong, but...
You'd take the number of µsv in a CT scan and divide it by the number of µsv in an airplane flight.
An equation equation is something like
Number of µsv in a CT scan=Number of µsv in airplane flight X number of flights


neonkitty
Post #585743 - Reply to (#585741) by 007demosthenes
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1:41 am, Jan 31 2013
Posts: 318


Quote from Transdude1996
Here is the unit conversion[/url] if that is what your looking for.

saved me the trouble of having to convert. bigrazz

Quote from 007demosthenes
Hit me if I'm wrong, but...
You'd take the number of µsv in a CT scan and divide it by the number of µsv in an airplane flight.
An equation equation is something like
Number of µsv in a CT scan=Number of µsv in airplane flight X number of flights


And that's it, I just checked with a few friends and we ended up with the same answer. smile We are very good at making things 10xs harder than they really are. laugh

Transdude1996
Post #586152
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10:17 pm, Feb 3 2013
Posts: 350


Two friends and I have to build a cardboard boat that can carry at least two of us. We are trying to figure out the volume that the boat will have to displace to at least do it. The total mass of the both of us is 200 kg. How do we find the volume of water that we displace, and what are some recommended equations that we should use?

Last edited by Transdude1996 at 3:18 am, Feb 4

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story645
Post #586243 - Reply to (#586152) by Transdude1996
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forum bunny
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4:16 pm, Feb 4 2013
Posts: 506


Looks pretty comprehensive: Cardboard boat

sakura8429
Post #586246
Member

4:30 pm, Feb 4 2013
Posts: 211


isn't that 200kg of water?

Transdude1996
Post #586427
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10:16 pm, Feb 5 2013
Posts: 350


Thank you. We kept on getting .2 m cubed as an answer, but we believed that it was wrong. Guess that we were right.

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jelzin89
Post #586442
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12:20 am, Feb 6 2013
Posts: 270


do you mean the volume of the water you displace when boarding the boat?

the weight force is : F= m*g (this m is the total mass of you two and the boat)

the force F you get is epuivalent to the weight force of the water you displace.

so you use: m= F/g to get the weight of the displaced water.

with the density equation you get the volume

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Transdude1996
Post #586444 - Reply to (#586442) by jelzin89
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12:44 am, Feb 6 2013
Posts: 350


That's what I said already. Thanks anyway.


Case Closed

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neonkitty
Post #589843
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7:37 am, Mar 7 2013
Posts: 318


anyone know what mytho-poetic explanations are?

Edit: never mind (:

Last edited by neonkitty at 4:22 pm, Mar 7

gojen
Post #614315
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Member

8:38 pm, Sep 12 2013
Posts: 122


Okay guys, this one is driving me nuts, and Google doesn't have any answers.

The problem is this

arccos(5)=x, which is the same as saying cos(x)=5. What is the value of x? I know it is supposed to be a complex number.

I can get as far as to say 10=e^(ix) + e^(-ix), but I don't remember what to do from here.... any takers?

for those wondering how I got to that,
e^(ix) = cos(x) + isin(x)
e^(-ix) = cos(x) - isin(x)

cos(x) = (e^(ix) + e^(-ix)) / 2

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Ashen-Shugar
Post #614319
Member

10:01 pm, Sep 12 2013
Posts: 27


arccos can be defined in terms of the complex logarithm to be arccos(x) = -i*ln(x + i*sqrt{1-x^2})

I think. You should go through the proof yourself.

theta = arccos(x)
e^(i*theta) = cos(theta) + i*sin(theta) = cos(arccos(x)) + i*sin(arccos(x))
= x + i*sqrt(1-x^2)

so: ln(e^i*theta) = i*theta = ln(x + i*sqrt(1-x^2))

FINAL ANSWER: arccos(5) = -i * ln(5-sqrt(24)) ~= 2.29 i

edit: checked in matlab, this is a correct answer. the general solution is x = -i * ln(5-sqrt(24)) + 2*n*pi because, of course, cosine is periodic (even in the complex plane)

Last edited by Ashen-Shugar at 10:52 pm, Sep 12

gojen
Post #614516
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Member

2:32 pm, Sep 14 2013
Posts: 122


Thank you. Also, your proof is quite nice. Now I don't have to go mad. smile

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strixflash
Post #651828
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Noblesse Forever!
Member

1:59 pm, Sep 11 2014
Posts: 1002


Urgent help! I am in first year in my undergraduate course and we are having C programming. Sadly tomorrow is exam! We are at very basic level so it's going to be easy or so I hope.

Could anyone please write a c code for the foll. question? I know how to find the average but how to find the best of two? Please write the program using stdio.h only... i mean no help of conio or some special functions as we haven't stsrted them.

Question: C-program to accept three test marks from user and print the average of best of two.

I would be greatful if you can provide the answer in few hours as we are having exam after 13 hours! T_T Thanks.

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lambchopsil
Post #651831
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Archon Solon
 

3:42 pm, Sep 11 2014
Posts: 7968


May not be exact C syntax since I didn't throw it into a compiler

The key is that it's harder to find the highest 2 of 3 than the lowest 1 of 3 (difference of finding 2 things vs 1 thing). But the two are actually equivalent in meaning for this question. Trying to find the former would involve more nested if/else statements


int averageofbestoftwo (double a, double b, double c)
{
double result = 0;

//find lowest number

//if a is lowest
if (a < b && a < c)
{
//then average b and c
result = (b + c) / 2;
}
//if b is lowest
else if (b < a && b < c)
{
//then average a and c
result = (a + c) / 2;
}
//then c is lowest
else
{
//then average a and b
result = (a + b) / 2;
}

return result;
}

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