Science & Mathematics - 22 September 2007

2007-09-22 08:12:27 · 3 answers · asked by Anonymous in Engineering

x+5y=-3
-3x+3y=9

help plzzz.

2007-09-22 08:10:14 · 3 answers · asked by Anonymous in Mathematics

2007-09-22 08:09:02 · 7 answers · asked by susan j 1 in Geography

The acceleration function of a bus is given by a(t) = 1.2t

a.) derive the bus's velocity and position functions. Show all appropriate calculus and algebraic steps.

b.) if the bus's velocity at time t = 1.0 sec is 5.0 m/s, what is its velocity at time t = 2.0 sec?

c.) if the bus's position at time t = 1.0 sec is 6.0 m, what is its position at time t = 2.0 sec?

After differenciating, i got
v = 2.4t^2 + vi
x = 4/5t^3 + vit + xi

are these right?, and if they are how would i find the next two answers?

plz show me your steps

2007-09-22 08:08:00 · 2 answers · asked by Alex M 1 in Physics

when salt is added to water it takes a longer time for the water to boil.

what can you conclude about the effect of salt on water?

2007-09-22 08:04:23 · 2 answers · asked by .:.:AODO4EVER2014:.:. 2 in Chemistry

says in my profile I have one star.. Not sure about this star stuff still New on here.

2007-09-22 08:00:36 · 2 answers · asked by Eileen J 7 in Astronomy & Space

how many...
protons__
neutrons__
electrons__

thanks

2007-09-22 07:59:35 · 1 answers · asked by Anonymous in Chemistry

as a paranormal investigator myself, i've only seen an orb with my naked eye, but it was so fast i put it down to 'corner of the eye', but whats yours?

2007-09-22 07:57:10 · 9 answers · asked by Anonymous in Paranormal Phenomena

How many MW (mega watts) does a nuclear power plant generate in a day and wat is the smallest nuclear power plant that can power a small city

2007-09-22 07:56:22 · 5 answers · asked by Tau dreadnaught 1 in Physics

Let's just say that Dr.H has two glasses of water that are 100mL each. One is 80C and the other is 60C. What will be the stable temperature of the mixture when I pour them both in one container?

Is it:
a) 60C
b) 65C
c) 70C
d) 75C
e) I know that it's a number in between the two but I'm not sure how to calculate it.

2007-09-22 07:55:24 · 6 answers · asked by Dr. H(Relax!) 1 in Physics

I tried some approaches,but my answer doesn't seem to be correct.
btw,my answer is 68.2 and proved to be wrong

2007-09-22 07:55:01 · 3 answers · asked by Jason N 2 in Mathematics

A pycnometer with a mass of 51.46 g when empty, has a mass of 97.77 g when filled with water (density = 1.000 g/mL), and a mass of 82.03 g when filled with liquid C.

What is the volume of the pycnometer?

What is the density of liquid C?

2007-09-22 07:54:22 · 1 answers · asked by jacobswilson 2 in Chemistry

I know that all chemical equations must be balanced for example C2H5OH+ 25 O2==> 16 CO2+ 18 H2O but suppose i m doing an expirement and i put ONLY one mole of C2H5OH+ one mole ofO2 what would i get as products? is there would be any reaction?

2007-09-22 07:54:06 · 2 answers · asked by zoozy 1 in Chemistry

2007-09-22 07:52:30 · 2 answers · asked by Anonymous in Chemistry

If pH = -log[H+] then does that mean that the pH for this CH3COOH 1.0M solution is 0? Thanks.

2007-09-22 07:50:52 · 2 answers · asked by Anonymous in Chemistry

2007-09-22 07:50:34 · 12 answers · asked by mccordshelbyanne 1 in Mathematics

2007-09-22 07:48:56 · 2 answers · asked by Mike c 1 in Chemistry

ive done lots of research on grays a type of alien me and my friends have seen 3 in my backyard hiding in the shadows i came face to face with one of them i found out there extremly weak should i kill them or leaf them to freak me out.

2007-09-22 07:48:19 · 14 answers · asked by 🤷‍♂️ 2 in Astronomy & Space

Say I go to a fast food restaurant 10 miles away to get lunch. I averaged 29 miles per hour on the way there. Anyway, I need my average speed to be 60 miles per hour for the whole round trip. How fast do I need to go on the way back?

Just say that I got the food in record time so it's negligible and time spent actually traveling is all that matters.

2007-09-22 07:46:07 · 5 answers · asked by Anonymous in Physics

i did this long ago but now i dont remember plz help
1.) Round 43.8516070 to the given place
.thousandths .ten thousandths

2.) Solve. Identify any nymber properties used.
.(25*7) + (25*3) . 82+67+18+33

3.) Estimate by rounding each number tp its greatest place value position. Then find the actual answer.

a.)7903*387 b.)76/19836

c.) 24/14100 d.) 82/885.6

e.) 7.2/275.184

4.) To travel on an airplane from New York to Milan and back costs $825 per person. How much money will be paid to the airline for 436 round trip passengers?



pleasee help me wit some theres around 40 problems on my hw...i only need this answers plz help me wit some =]]

2007-09-22 07:44:42 · 3 answers · asked by Anonymous in Mathematics

A. the speed of the object as it falls is 9.8m/s.
B. the object falls 9.8 meters during the first second only.
C. derivative of the distance with respect to time for the object equals 9.8m/s^2.
D. speed of object increases 9.8 m/s during each second
E. object falls 9.8 meters during each second

I think its D

2007-09-22 07:41:59 · 3 answers · asked by XzoeyX 2 in Physics

i've been a member of a local ghost hunting group for a year now & have enjoyed investigations etc, but the group seems to be falling apart, have you ever left one group & joined another one? if so, what was the transition like please?

2007-09-22 07:40:18 · 4 answers · asked by Anonymous in Parapsychology

(x-5)^2-4?
Help?

2007-09-22 07:39:09 · 4 answers · asked by Sophia D 1 in Mathematics

Do you believe California is in for a large earthquake soon. Southern Californians, please answer. Do the recent earthquakes in Sumatra and Chatsworth scare you?

If you are not from SoCal please state your residency state.

2007-09-22 07:28:01 · 3 answers · asked by dreamliner787 1 in Earth Sciences & Geology

state the domain (rounded accurate to four decimal places) and the range 9exact values) of the function f(x)= (x^3-5x+2)^1/2.

It is (x^3-5x+2) under square root.
Thanks

2007-09-22 07:27:50 · 2 answers · asked by Kakak 1 in Mathematics

On monday, Brad buys a space hero model for $8. HE sells it to a friend for $10 on Tuesday. On Wednesday he buys it back for $12. He sells it to another friend on Thursday for $14. How much did Brad make or lose all together on these transactions

2007-09-22 07:27:07 · 6 answers · asked by Anonymous in Mathematics

Any help will be greatly appreciated.

2007-09-22 07:25:28 · 11 answers · asked by biggdogg75951 2 in Mathematics

can you help me identify the following,,,?

1.) salad dressing
2.) motr oil
3.) pancake syrup
4.) marbel chips
5.) paper towel
6.) coal
7.) glass
8.) sand
9.) wood
10.) salt water

and can you tell me your reason why?

2007-09-22 07:24:36 · 1 answers · asked by Juan C 6 in Chemistry

You plan a trip on which you want to average 90km/h. You cover the first half of the distance at an average speed of only 48km/h. What must your average speed be in the second half of the trip to meet your goal? Note that the velocities are based on half the distance, not half the time.

2007-09-22 07:21:14 · 3 answers · asked by Anonymous in Physics

2007-09-22 07:21:08 · 3 answers · asked by magpie 6 in Earth Sciences & Geology