Science & Mathematics - 13 November 2006

h(t)=-1.96t^2+10t+0.5 models the height of the mass of a rock, so when did the mass hit the surface of the lake?

2006-11-13 11:50:28 · 3 answers · asked by KE 1 in Mathematics

2006-11-13 11:49:32 · 3 answers · asked by Samantha M 1 in Chemistry

I believe it is b, just wanted to double check.

A flatbed truck is carrying a 20.0-kg crate along a level road. The coefficient of static friction between the crate and the bed is 0.400. What is the maximum acceleration that the truck can have if the crate is to stay in place?
a. 3.92 m/s squared.
b. 8.00 m/s squared.
c. 78.5 m/s squared.
d. 196 m/s squared.

2006-11-13 11:48:57 · 1 answers · asked by Banana28 1 in Physics

2006-11-13 11:48:51 · 5 answers · asked by Joshua B 1 in Zoology

If a weather report indicates that the relative humidity is 90%, what would happen if the temperature dropped by ten degrees celcious?

2006-11-13 11:48:40 · 5 answers · asked by lala 2 in Other - Science

2006-11-13 11:46:36 · 4 answers · asked by Joshua B 1 in Zoology

Why? Because lunar bases will have limited amounts of power stored in fuel cells during the 2 week lunar night and crop illumination demands lots of power. If the crops could be cooled down and hibernate during 2 weeks of night under low light or no light at all it will make lunar bases more likely to suceed. Eventually, there will be solar power plants on both sides of the Moon and a power grid for constant power to bases. Getting a nuke pwr. plant to the Moon will face intense opposition but would be the best thing for a lunar base. During lunar day plentiful solar energy could power all sorts of industry and supply filtered light for crops, but at night we'd power down industry and rely on stored power. Just a small nuke for crop light would be welcome. If we can't have it and crops can hibernate for 2 weeks/mo. farms could still suceed. O2 would be stored up by day and CO2 could be frozen out by night cause the hibernating plants won't be able to recycle CO2 to oxygen.

2006-11-13 11:46:25 · 5 answers · asked by David D 1 in Astronomy & Space

Since the space station's main purpose to be a stepping stone toward colonization of the moon and mars, why don't they try to grow their own food and be more self sufficient? Also, if they created such a room it would make the sterile life on the station more tolerable. The plants would remove co2 and add o2.

2006-11-13 11:46:06 · 3 answers · asked by timespiral 4 in Astronomy & Space

Is this the truth? I want to know.

2006-11-13 11:45:12 · 5 answers · asked by American Splendor 5 in Other - Science

du/dt=u^3(t^3-t) find Antideritive, U=?

Find the general solution to the above differential equation.

2006-11-13 11:44:56 · 2 answers · asked by Good life 2 in Mathematics

me and my friend were having an argument, he said it will join back together, i say it will die.

2006-11-13 11:44:28 · 7 answers · asked by Anonymous in Zoology

Please help me!

2006-11-13 11:44:12 · 3 answers · asked by ♥IslamForever♥ 5 in Earth Sciences & Geology

2006-11-13 11:42:04 · 3 answers · asked by Anonymous in Mathematics

different shapes of polygons are given and which one can reduce the cost of manufacturing aluminium can.

2006-11-13 11:42:03 · 2 answers · asked by A'in 1 in Engineering

Woula spacecraft need as much fuel to escape from the moon's gravity as it would to escape from the earth's?



(True or False) If the moon did not reflect any of the sun's light, it would not be visible from earth

2006-11-13 11:41:48 · 16 answers · asked by Anonymous in Astronomy & Space

1)Find the equation of a parabola with vertex (3,4) and y-intercept (0-5)

2) The sum of two the numbers 325 and the difference of the squares of these two numbers are 125. Use the system of two equations to find the numbers.

3) Write y=1/4X^2 +4X -7 in the form y= a(x-h)^2 +k

2006-11-13 11:41:06 · 4 answers · asked by Aleister 2 in Mathematics

L1 +L2, with L1 = 20cm and L2 = 80cm. The rod is held horixontally on the fulcrum and then released. What are the magintudes of the initial acceleratoins of (a) particle 1 and (b) particle 2?

2006-11-13 11:40:23 · 2 answers · asked by gods1princesschanel 1 in Physics

Anyone evr taken this class is college? what was it like - any suggestions

2006-11-13 11:40:14 · 4 answers · asked by Question! 1 in Astronomy & Space

2006-11-13 11:38:25 · 7 answers · asked by robert a 1 in Astronomy & Space

if you know what it is?

2006-11-13 11:37:58 · 3 answers · asked by oharakage 1 in Biology

Can you help me?
I'm so out of it right now. Here are the problems,show your work please!
57.9÷3
44÷55000
thanks!

2006-11-13 11:37:41 · 1 answers · asked by Anonymous in Mathematics

2006-11-13 11:37:29 · 7 answers · asked by jennylo 2 in Mathematics

she won the lottery, she gave 4/5 to her teacher, and the rest divide it with her 4 friends, then she only had 3 $ left. What did she started with.
Hint: work backward

2006-11-13 11:37:15 · 3 answers · asked by magiccumbito 2 in Mathematics

For what values of k does the equation kx^2 + k = 8x - 2kx have 2 zeros? Show your work.

2006-11-13 11:37:10 · 3 answers · asked by thomasgraham880 1 in Mathematics

A rough-coated male guinea pig is crossed with a homozygous smooth-coated female (rr). Their offspring are rough-coated and smooth-coated in a 1:1 ratio. Use a Punnett square to calculate the genotype of the male parent

2006-11-13 11:36:47 · 2 answers · asked by Anonymous in Biology

2006-11-13 11:36:09 · 3 answers · asked by superstar 2 in Chemistry

and longitude 102degres E; the fire ball thus created was the bightest flash seen by anyone before nuclear weapons. The Tunguska Event, which according to one chance witness "convered and enormous part of the sky," was probably the explosion of a stony asteroid about 140m wide. (a) Considering only Earth's rotation, determine how much later the asteroid would hav had to arrive to put the explosion above Helsinki at longitude 25degrees E. This would have obliterated the city. (b) If the asteroid had, instead, been a metallic asteroid, it could have reached Earth's surface. How much later would such an asteroid have had to arrive to put the impact in the Atlantic Ocean at longitude 20degrees W?

2006-11-13 11:34:49 · 3 answers · asked by gods1princesschanel 1 in Physics

2006-11-13 11:34:10 · 10 answers · asked by Anonymous in Mathematics

2KClO3(s) → 2KCl(s) + 3O2(g)

what volume (mL) of O2 is collected over water at 24.0 C by the reaction of 0.251g of KClO3 if the barometric pressure is 721.8 mm Hg.

The vapor pressure of water at 24.0 C is 22.4 mm Hg

2006-11-13 11:32:46 · 1 answers · asked by geebgeebgeeb 1 in Chemistry

2006-11-13 11:32:45 · 3 answers · asked by Edward S 1 in Mathematics