Science & Mathematics - 29 October 2006

2006-10-29 10:59:18 · 4 answers · asked by tameem s 1 in Mathematics

Marneshia, who is 1.676 meters in height, stands at the base of the Eiffel Tower. Marneshia’s shadow at 2.5 meters is far shorter than the Eiffel Tower’s 412 meter shadow. What is the height of the Eiffel Tower, rounded to the nearest meter? Show all your work for credit.

2006-10-29 10:57:37 · 3 answers · asked by Roberta A 1 in Mathematics

It is rotating in the xy plane about the z axis passing through its center, perpendicular to its length. The mass of each oxygen atom is 2.66 x 10^-26 kg, and at room temperature, the average separation distance between the two oxygen atoms is
2.02 x 10^-10 m (atoms treated as point masses). if the angular speed of the molecule about the z axis is 5.61 x10^12 rad/s, what is the rotational kinetic energy (answer in J)?

2006-10-29 10:57:35 · 1 answers · asked by Anonymous in Physics

2006-10-29 10:56:31 · 2 answers · asked by John 1 in Physics

Lisa packs pencils in boxes.
She packs 12 pencils in each box.
Lisa packs X boxes of pencils.

a) Give an expression, in terms of X, for the number of pencils Lisa packs.

Lisa also packs pens in boxes.
She packs 10 pens into each box.
Lisa packs Y boxes of pens.

b) Give an expression, in terms of X and Y, for the TOTAL number of pens and pencils Lisa packs.


Hope you can help, could you please explain how you got to your answer.

2006-10-29 10:55:53 · 16 answers · asked by Anonymous in Mathematics

A player plays a gam against the bank, where she tosses two coins. The player wins if two heads, whilst the bank wins if any other combination appears.

a) Is two heads equally likley to come up as any other single number?
b) if the coints are tossed 60 times, how many times woudl you expect wo heads to come up?
c) if you bet $1 on getting two heads, what would you have to win back so that in the long term you win as much as you lose.


I didn't understand the calculations or formula for this at all, so if you could explain in elementary terms, (make it long if you have to) that would be really helpful.

2006-10-29 10:51:49 · 3 answers · asked by Anonymous in Mathematics

2006-10-29 10:50:36 · 5 answers · asked by Cali 1 in Zoology

If a pesticide inhibits Acetylcholinesterase(an enzyme that breaks down acetylcholine, what response would you expect in a case of accidental poisoning with the pesticide?

A. Excitatory responses of the neuromuscular junction will be inhibited
B. Excitatory responses of the neuromuscular juction will be enhanced
C. Too much acetylcholine will be released at the neuromuscular junction.

2006-10-29 10:49:05 · 2 answers · asked by Christopher R 1 in Botany

If a pesticide inhibits Acetylcholinesterase(an enzyme that breaks down acetylcholine, what response would you expect in a case of accidental poisoning with the pesticide?

A. Excitatory responses of the neuromuscular junction will be inhibited
B. Excitatory responses of the neuromuscular juction will be enhanced
C. Too much acetylcholine will be released at the neuromuscular junction.

2006-10-29 10:48:51 · 3 answers · asked by Christopher R 1 in Biology

2006-10-29 10:47:41 · 6 answers · asked by Anonymous in Other - Science

Please help me. I am at my wits end on how to answer this question.
Thanks in advance.

2006-10-29 10:47:16 · 1 answers · asked by Anonymous in Chemistry

A grindstone in the shape of a solid disk with diameter 0.520 m and a mass of 50.0 kg is rotating at 800 rev/min. You press an ax against the rim with a normal force of 160 N and the grindstone comes to rest in 8.50 s. Find the coefficient of kinetic friction between the ax and the grindstone.
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2006-10-29 10:44:53 · 1 answers · asked by cheezo12 1 in Physics

2006-10-29 10:44:07 · 3 answers · asked by fwc95 1 in Zoology

Hi, im doing a project for school, and really need some pictures of these things in the rainforest (tropical)!! please help me out and give me some links!!! thanks:

Mutualism
Commensalism
Parasitism
{redator/Prey relationships
Competition
Mimicry
scavenging

thanks again

2006-10-29 10:43:24 · 3 answers · asked by George 2 in Biology

2006-10-29 10:43:19 · 4 answers · asked by P6890T 1 in Chemistry

2006-10-29 10:41:44 · 8 answers · asked by maggie 1 in Physics

I know that theoretically in a singularity all the of the sub atomic particles are extremely condense and are touching each other. I also know that a measure of temperature is molecular movement. From everything I have read, black holes have a high temperature. My question is, if the molecules are "jammed together" how can they move. Therefore if they can't move how can a blackhole be hot?

2006-10-29 10:40:43 · 6 answers · asked by staterules9 3 in Astronomy & Space

between ionic and molecular compounds? I can't find it in my notes and I can't find the definition I'm looking for on the internet. Also, how can you tell the difference just by looking at the formula? Ex: LiBr
Thanks!

2006-10-29 10:40:01 · 2 answers · asked by Anonymous in Chemistry

and plz explain y it is.

h(x) = 1.1 - 2x

2006-10-29 10:39:24 · 8 answers · asked by Anonymous in Mathematics

2006-10-29 10:39:18 · 15 answers · asked by Philip W 1 in Biology

2006-10-29 10:39:13 · 2 answers · asked by Anonymous in Astronomy & Space

2006-10-29 10:38:54 · 5 answers · asked by peewee 1 in Geography

Although I struggled with maths, probably because I didn't like my Maths teacher. I loved Physics, Chemistry and Biology. They were taught separately when I was at school. Chemistry was my favourite.

2006-10-29 10:33:07 · 8 answers · asked by Anonymous in Chemistry

1/8x + 3/4 = 5/2

2006-10-29 10:31:40 · 8 answers · asked by Advisor 1 in Mathematics

can someone tell me all the numbers 55 is dividible by?!?!

2006-10-29 10:29:52 · 11 answers · asked by dancing on the sumbeams 1 in Mathematics

2006-10-29 10:29:51 · 3 answers · asked by Anonymous in Chemistry

2(x + 3) = 6(x - 3)

Now if I am figuring this right, I can mow the 2 and 6 inside the parentheses which would make it (2 + 3) = (6 - 3) ?

2006-10-29 10:29:37 · 11 answers · asked by Advisor 1 in Mathematics

Phosphorus trichloride gas and chlorine gas react to form phosphorus pentachloride gas.
PCl3(g) + Cl2(g) PCl5(g)

A gas vessel is charged with a mixture of PCl3(g) and Cl2(g), which is allowed to equilibriate at 450 K. At equilibrium the partial pressures of the three gases are PPCl3 = 0.124 atm, PCl2 = 0.157 atm, and PPCl5 = 1.30 atm.
(a) What is the value of Keq at this temperature?

2006-10-29 10:28:46 · 3 answers · asked by Anonymous in Chemistry

??????

2006-10-29 10:28:18 · 19 answers · asked by Vibbian is evil 2 in Zoology

Convert 60 miles per hours to inches per minute.

Thanks.

2006-10-29 10:28:00 · 4 answers · asked by Anonymous in Mathematics