Science & Mathematics - 30 September 2007

Daniel walks directly towards a flat mirror with a rapidity of 0,25 m/s
he determines the rapidity of his image with respect to.

to 0,13 m/s
b 1,0 m/s
c 0,50 m/d
d 0,25 m /s
and 0.75

I chosen i C, am correct


thanks

2007-09-30 06:30:32 · 2 answers · asked by Anonymous in Mathematics

carbon dioxide do to the atmospere?

2007-09-30 06:30:14 · 1 answers · asked by Tweek 3 in Earth Sciences & Geology

i mean like what types of trees are in the us the most you can name! please and thanks.

2007-09-30 06:24:04 · 2 answers · asked by gratefulbuehler 3 in Earth Sciences & Geology

Find the Density of the water.


Density = Mass/Volume

Here is some information you will need. The data has been collected for you.

Item Mass
Empty graduated cylinder 41.6 grams
Graduated cylinder containing 82 ml of water 123.1 grams
Mass of the water ? grams
Density of the water ? g/mL

What was the density of the water in g/mL

2007-09-30 06:20:37 · 4 answers · asked by Anonymous in Chemistry

... for my physics hwk (gcse level) i have to 'write an epitaph dedicated to Newton' - can someone plz help me with any ideas?
thanks

2007-09-30 06:18:06 · 6 answers · asked by no-one listens... 2 in Physics

2007-09-30 06:07:01 · 3 answers · asked by beth 1 in Geography

What's 90% as a fraction? And whats 5% as a fraction. BUT tell me how you got this. lol 10 points for winner

2007-09-30 06:04:50 · 6 answers · asked by Revinder 2 in Mathematics

2007-09-30 06:03:07 · 4 answers · asked by m&m's are the best !!! 2 in Weather

2007-09-30 06:01:49 · 10 answers · asked by southern_rdhd_angel 1 in Mathematics

a 1300Kg car moves along a horizontal road at speed v0=25.2m/s . the road is wet so the static friction coefficient between tires and the road is only Us= .379 and the kinetic friction coefficient is even is even lower, Uk= .2653. Assume acceleration of gravity is 9.8m/s^2.

2007-09-30 05:55:38 · 1 answers · asked by Anonymous in Physics

2007-09-30 05:51:58 · 4 answers · asked by Random_girl 2 in Mathematics

2007-09-30 05:51:18 · 5 answers · asked by Jared v 1 in Engineering

a) e^(2x+3) - 7 = 0
b) ln(5-2x) = -3

2007-09-30 05:44:29 · 9 answers · asked by Vince 1 in Mathematics

its for a science project.. in french...

2007-09-30 05:42:26 · 3 answers · asked by KeepingTheFaith♥ 4 in Botany

A teacher says the following is true:

XY + ¯X ¯Y = 1

Do you agree or not, if yes then why?
I don't because:
Z + ¯Z = 1 BUT if Z=XY then ¯Z is not equal to ¯X¯Y
in fact ¯Z = ¯(XY) = ¯X + ¯Y

any other opinions?

2007-09-30 05:40:59 · 3 answers · asked by Wayne 2 in Engineering

The Sun is in the sky. Genesis 1

2007-09-30 05:34:58 · 13 answers · asked by Anonymous in Astronomy & Space

2007-09-30 05:34:28 · 3 answers · asked by ? 5 in Chemistry

aparently a human babie and a chimpanzie baybe are exactly the same until a certin point in theire lives. how old (aproximatley) are they at this point.

2007-09-30 05:34:15 · 11 answers · asked by Floyd U 2 in Biology

i want an official website of where u can buy/name a star for REAl and not some fake printout

i want to buy a star for my mom for her b-day

2007-09-30 05:28:04 · 9 answers · asked by Anonymous in Astronomy & Space

2007-09-30 05:27:37 · 7 answers · asked by Cody 1 in Earth Sciences & Geology

2007-09-30 05:23:04 · 10 answers · asked by Tony P 2 in Earth Sciences & Geology

it seems every time I use window cleaner and 409...the next day i have sinus headache...could the cleaners cause this?

2007-09-30 05:21:32 · 1 answers · asked by S i r i 1 in Medicine

Be objective plz

2007-09-30 05:19:00 · 4 answers · asked by Anonymous in Physics

Do you live in western Colorado? Do you think your house is Haunted and have things going on you cannot explain?Have you tried everything you can think of and are at your witt's end? leave a answer for me and I will be in touch.we can help

2007-09-30 05:14:46 · 6 answers · asked by Ron F 4 in Paranormal Phenomena

I'm really dumb for not getting this one but I'm really exhausted after 60 problems. So a guy tosses a basket ball into a hoop that is 3.048 m high at an angle of 47 degrees and a velocity of 17 m/s. The man's height is 2.554 m. How long does it take the ball to achieve its maximum height (the half g a^2 formula is not working for me). How long for it to reach the hoop and the horizontal length of the shot. I've been up all night so please help me.

2007-09-30 05:13:25 · 1 answers · asked by Crashovdr 4 in Physics

track* is a wall that slopes upward at a 12 degress angle with the horizontal. As you face the window (o.9m high, 2.0m wide) in your compartment, the train is moving to the left, as the rawing indicates. The top edge of the wall appears at window corner. The top edge of the wall first appears at a window corner A and eventually disappears at window corner B. How much time passes betwen appearance and disapppearance of the upper edge of the wall?

2007-09-30 05:08:05 · 1 answers · asked by Anonymous in Physics

please explain?

2007-09-30 05:06:09 · 6 answers · asked by Anonymous in Physics

2007-09-30 05:06:06 · 18 answers · asked by CLAIRE L 2 in Astronomy & Space

Solve the equation by making an appropriate substitution:

(x2 - 3x)2 - 14(x2 - 3x) + 40 = 0

a. {-2, -1, 5, 4}
b. {-2, -1, 10, 4, 5, 4}
c. {10, 4}
d. {5, 4}

2007-09-30 05:05:29 · 6 answers · asked by charliemo 1 in Mathematics

A pumped-storage reservoir sits 155 m above its generating station and holds 8.5 *10^9 kg of water. The power plant generates 320 MW of electric power while draining the reservoir over an 8.5 hour period. What fraction of the initial potential energy is lost to nonconservative forces (i.e., does not emerge as electricity)?

2007-09-30 05:04:39 · 2 answers · asked by dsgdh 2 in Physics