Science & Mathematics - 20 October 2007

2007-10-20 13:44:51 · 3 answers · asked by nana ♥ 2 in Chemistry

If you could answer any of these that would be great..
A: If you spend a million dollers a day, how many years would it take to spend one mole of dollars?
B: How many moles of pencil marks can can you make in one minute?
C: If the surface area of the Pacific Ocean is 1.6576x10>8 sq. km and the average depth is 4,028 meters, how many moles of water are in the pacific? (Hint: 18cm>3 = 1mole water)
D: If the average penny is 2mm thick, how far toward the sun would a 1 mole stack of pennies reach?

2007-10-20 13:44:47 · 2 answers · asked by EM 2 in Mathematics

I have a question that requires me to "write the inverse of matrix A as a product of 4 elementary matrices" How would I go about doing this? I have already written A as a product of elementary matrices does this help at all?

2007-10-20 13:43:25 · 3 answers · asked by Bikki 3 in Mathematics

2007-10-20 13:43:22 · 10 answers · asked by Anonymous in Physics

y is it more people have recessive traits compared to people having dominant traits?

2007-10-20 13:40:51 · 5 answers · asked by Anonymous in Biology

the title says it all

2007-10-20 13:40:45 · 6 answers · asked by fisher132 1 in Astronomy & Space

2007-10-20 13:39:19 · 13 answers · asked by wats2004 2 in Mathematics

Question: A beech tree has small, green-coloured flowers. Explainwhy it is unlikely that beech lowers are pllinate by insects. Suggest the most likely mothod of pollination. (I know its by wind but i have no idea why insects don't pollinate it =S THANKS!! <3)

2007-10-20 13:37:28 · 4 answers · asked by Anonymous in Botany

(a) 14.7
(b) 44.0
(c) 78.0
(d) 26.0

2007-10-20 13:37:01 · 1 answers · asked by Edgardo M 1 in Chemistry

2007-10-20 13:33:25 · 3 answers · asked by Danny 1 in Physics

2007-10-20 13:32:50 · 9 answers · asked by Anonymous in Mathematics

a. If you press a book flat against a vertical wall with your hand, in what direction is the friction exerted by the wall on the book?

b. A crate is shitting in the center of a flatbed truck. As the truck accelerates to the east, the create moves with it, not sliding on the bed of the truck. In what direction is the friction force exerted by the bed of the truck on the crate?

Please also explain why. Thank you.

2007-10-20 13:32:29 · 7 answers · asked by Anonymous in Physics

2007-10-20 13:31:31 · 6 answers · asked by susan l 2 in Other - Science

t^2/3 + t^1/3 - 6 = 0

Please tell how you got the answer too because I need to understand it for a test coming up. Thanks so much.

2007-10-20 13:30:42 · 6 answers · asked by Anonymous in Mathematics

x^2 + 6x = 7

Please tell how you got the answer too because I need to understand it for a test coming up. Thanks so much.

2007-10-20 13:29:11 · 14 answers · asked by Anonymous in Mathematics

A rectangular class seats 72 students. If the seats were arranged with 3 more seats in each row, the class would have 2 fewer rows. Find the original number of seats in each row.

How many liters of water must be added to 20 L of a 24% salt solution to make an 8% salt solution?

Two planes leave simultaneously from the same airport, one flying due north and the other flying due east. The northbound plane is flying 50 mi/hr faster than the eastbound plane. After 3 hours, the planes are 2440 miles apart. Find the speed of each plane.

Before you yell at me to do my own homework, keep in mind that I already did attempted these problems. These are the only three problems I keep missing on my math homework. Any help would be appreciated. There is no need to give me the answers, but it'll be helpful if you point me in the right direction.

2007-10-20 13:29:01 · 3 answers · asked by xılǝɥ ⋆ 5 in Mathematics

A 450 kg mass is accelerated at 2.5 m/s^2.

a. What is the net force causing this acceleration?
b. How much distances will it cover after 3.5s

Please show me how to do this problem.

2007-10-20 13:28:29 · 3 answers · asked by Anonymous in Physics

Please tell how you got the answer too because I need to understand it for a test coming up. Thanks so much.

2007-10-20 13:27:43 · 5 answers · asked by Anonymous in Mathematics

5 - i / -7 + 2i

I think the i's mean imaginary numbers or something.
Please tell how you got the answer too because I need to understand it for a test coming up. Thanks so much.

2007-10-20 13:26:52 · 3 answers · asked by Anonymous in Mathematics

009 (part 1 of 1) 10 points
A person of mass 77.9 kg escapes from a burn-
ing building by jumping from a window situ-
ated 23.7 m above a catching net.
The acceleration of gravity is 9:8 m/s2 :
If air resistance exerts a force of 76.7 N on
him as he falls, determine his speed just before
he hits the net. Answer in units of m/
s.

2007-10-20 13:23:28 · 3 answers · asked by dojorno5 2 in Physics

2007-10-20 13:23:24 · 1 answers · asked by Sergio P 2 in Physics

how long is 5 km/hr for 15 minutes?

the answer needs to be in kilometers. please show how you figured out your answer. thanks in advance :)

2007-10-20 13:21:38 · 7 answers · asked by skateme1 2 in Mathematics

If a doctor was to diagnose a patient's tumor as benign and encapsulated, how would they describe this condition to the patient?

2007-10-20 13:20:44 · 21 answers · asked by lvliss.lvlanda 4 in Medicine

x Tan(9/x)
Lim x-> infinity
I know it would be tan(9/x)/(1/x) or x/(1/tan(9/x) but I am not sure which one to use help please

2007-10-20 13:19:32 · 1 answers · asked by Smokey. 6 in Mathematics

2007-10-20 13:17:58 · 3 answers · asked by Class of '09 3 in Astronomy & Space

2007-10-20 13:13:39 · 4 answers · asked by Anonymous in Mathematics

2007-10-20 13:10:54 · 2 answers · asked by Lostwithchem 1 in Physics

Corollary 4.2 - there can be at most one right or obtuse angle in any given triangle.

2007-10-20 13:07:32 · 2 answers · asked by Sabreen 2 in Mathematics

V= Volt
I= current or amp
R= resistance or ohm


Your iPod’s battery produces 3.7v and the iPod circuit draws 0.1Amp from the battery. Check True or False (T/F) for the statements on the answer sheet (page 4 of this homework) for this problem.


(3) __F_ From Ohm’s law V=IR, there must be a 37Ohm resistor in your iPod.

By V=IR 3.7 V/.1 Amp = 370 R

___T_ Your iPod consumes 0.37W power.

P= VI .1 amp * 3.7 volt = .37 W

__T__If a 37Ohm resistor is connected to the iPod battery, it will consume the same power as your iPod.

V=IR V = .1 amp * .37 ohm = 3.7v’
P=VI 3.7 volt * .1 amp = .37 W


____You can store and play your favorite music on a 37 Ohm resistor.

WTF? FALSE?

____When you turn off the iPod, the battery voltage drop to zero.

TRUE?

____When you turn off the iPod, the current drawn from the battery drop to zero

TRUE?



Can you check my work for first 3 parts? Last parts I'm stuck. help?

Thanks for looking

2007-10-20 13:07:11 · 1 answers · asked by Ali G 1 in Physics

Why is there 3 Oxygen atoms? why not 2 or 1?
and last but not least.....why do we put the negative and positive after the number when stating the oxidation number and the charge?
thanks

2007-10-20 13:04:37 · 5 answers · asked by Boo Radley 4 in Chemistry