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Science & Mathematics - 16 October 2007

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A series circuit of 12V source of emf, a 2.00 mF capacitor and a 1000 ohms resistor and switch. When the switch is closed, how long does it take for the current to reach one half its maximum value?

a) 0.693 s
b) 1.39 s
c) 2.00 s
d) 1.69 s
e) 0.0250 s

please help, thanks

2007-10-16 05:06:12 · 2 answers · asked by Anonymous in Physics

2007-10-16 05:05:06 · 12 answers · asked by Umka_J_N. III 1 in Astronomy & Space

1/x +3/x^2
------------------------
1 + 1/x -6/x^2

2007-10-16 05:01:43 · 13 answers · asked by JEEZY 1 in Mathematics

f(x) = square root of [9 - x(squared) ]

What do I do?

I think it has something to do with the inverse f-1

2007-10-16 04:59:17 · 5 answers · asked by Luby 5 in Mathematics

compare and contrast the two

2007-10-16 04:57:31 · 1 answers · asked by Fern 1 in Botany

is there any particular type of medicated oil used for relieving pain such as muscle or shoulder pain contraction caused by vomitting too much? how i know if its safe?

2007-10-16 04:56:13 · 1 answers · asked by mikecivic2003 1 in Medicine

im doing this for a science project and could anyone please tell me the highest mountains name and hight

2007-10-16 04:51:17 · 12 answers · asked by Anonymous in Astronomy & Space

I think thinking is faster than the speed of light, maybe someday I can creat a technology to use thinking to travel to another star anywhere in the big bang within less than a second. What do you think?

2007-10-16 04:50:13 · 15 answers · asked by IBoyIHeartIDragon@yahoo.com N 2 in Astronomy & Space

2007-10-16 04:50:06 · 4 answers · asked by Padmini Gopalan 4 in Physics

If x people, all working at the same rate, can do a certain job in y hours, then one person working alone at this rate, could do the job in how many hours. (in terms of x and y)

2007-10-16 04:38:42 · 4 answers · asked by i-play-the-fish 3 in Mathematics

A small block with mass m rests on a frictionless horizontal tabletop a distance r from a hole in the center of the table (the figure ). A string tied to the small block passes down through the hole, and a larger block with mass M is suspended from the free end of the string. The small block is set into uniform circular motion with radius r and speed v.What must v be if the large block is to remain motionless when released?Express your answer in terms of the variables r,M ,m , and g.

2007-10-16 04:36:49 · 1 answers · asked by Natiphy2007 1 in Physics

I read in astronomy magazine that mercury is comming into view next month. Has anyone ever seen mercury?

2007-10-16 04:27:35 · 4 answers · asked by Anonymous in Astronomy & Space

2007-10-16 04:24:09 · 9 answers · asked by Anonymous in Mathematics

My submersible pump installed at a depth of 160' in a 4.5" borehole got stuck in mud during the last september rain.How to recover it .Pl.help m in recovering it?

2007-10-16 04:19:52 · 3 answers · asked by Yogi 1 in Engineering

2007-10-16 04:17:51 · 2 answers · asked by jacqueline u 1 in Botany

1

is there cost effective way to store up the electricity or energy generated by a solar cell in the day and use it at night? can you explain it thanks

2007-10-16 04:11:35 · 3 answers · asked by mark 2 in Engineering

(Answer if you know correctly about it........)

As we know.....................

When an electron moves from one orbit to another a it get wiggled.And emit radiations.................

Now the question is....... How this radiations produce?
What is this radiations?
Is this Energy which it emit in form of radiations?

2007-10-16 04:06:56 · 3 answers · asked by fha_chafzeto 2 in Physics

2007-10-16 04:03:05 · 7 answers · asked by Jose M 1 in Astronomy & Space

It will destroy everything. No survivors. For those 60 minutes, what would you do?

2007-10-16 03:49:42 · 12 answers · asked by I love my baby boy! 5 in Astronomy & Space

We're doing an experiment and it's hard to derive the relationship between a metal's density and its ability to conduct heat... Is there such a relationship or does the metal's ability to conduct heat based solely on atomic structure?

2007-10-16 03:49:17 · 3 answers · asked by grnd_brkr17 2 in Physics

the discoverer of the patented enola bean.

2007-10-16 03:48:02 · 3 answers · asked by Frances 2 in Botany

the smokey crystal quartz is roughly 12" by 12" by12" and weighs about 35 kilos and the geode is 18"long by 6"wideby6" high and weighs around 15 kilos and the amethyst stones are almost black

2007-10-16 03:43:41 · 1 answers · asked by ibwayne4u 1 in Earth Sciences & Geology

I know that certain forms of household and industrial waste can be recycled, paper, glass and aluminium for example.

Whilst I know that after a certain point recycling stops being an efficient use of resources. I was curious as to how far recycling could be taken as a technology.

For example, would it be more cost effective at some point in the future to mine rubbish dumps for the resources they contain as opposed to mining the raw matreials.

I'm not sure but I vaguely recollect something about "energy" used in recycling versus that used in refining and that at some point theres a trade-off between the two.

2007-10-16 03:40:51 · 5 answers · asked by shaithin 1 in Engineering

Did anyone actually find gold there? even a small amount?

Thanks.

2007-10-16 03:39:29 · 5 answers · asked by Sofia 1 in Earth Sciences & Geology

People who have accidentally swallowed heavy metal salts (such as those with mercury, silver or lead) may be g
People who have accidentally swallowed heavy metal salts (such as those with mercury, silver or lead) may be given egg white as an emergency treatment Explain why egg whites would be used?

2007-10-16 03:31:34 · 1 answers · asked by Mark F 1 in Medicine

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