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April 20, 2014

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Recent Science Questions

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Science
Which of the following best summarizes the function of the respiratory system? A. to transport oxygen to cells and wastes away from cells. B. to protect the organs in the chest cavity C. to move oxygen from the air into the body and carbon dioxide from the body into the air D...
Sunday, February 2, 2014 at 8:05pm

science
How often would a restriction enzyme such as Not I, which has 8 nucleotides in its recognition sites 5’-GCGGCCGC-3’, cleave DNA on average? Would it cleave a species DNA more or less often if the DNA from that species were 70% A-T rich?
Sunday, February 2, 2014 at 7:57pm

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
Sunday, February 2, 2014 at 7:16pm

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
Sunday, February 2, 2014 at 7:16pm

Science
Which of the following best summarizes the function of the respiratory system? A. to transport oxygen to cells and wastes away from cells. B. to protect the organs in the chest cavity C. to move oxygen from the air into the body and carbon dioxide from the body into the air D...
Sunday, February 2, 2014 at 6:59pm

Physical Science
Explain the energy conversions that occur as a basketball falls, hits the ground, and bounces back up. Ignore frictional forces.
Sunday, February 2, 2014 at 6:02pm

Science
I agree.
Sunday, February 2, 2014 at 5:56pm

law
Ron supervises delivery of flowers for a wholesale distributor of fresh flowers, Flowers. Inc. In order to accommodate one of the company’s best customers, Ron offers to immediately rush a delivery of fresh peonies. All of the delivery trucks are currently out on delivery...
Sunday, February 2, 2014 at 5:31pm

science
pls answer the above question
Sunday, February 2, 2014 at 5:14pm

Science
Name the components of the respiratory system in the order incoming air would encounter them during breathing. A. trachea, pharynx, larynx, alveoli, bronchi B. bronchi, larynx, alveloi, trachea, pharynx C. larynx, trachea, bronchi, pharynx, alveoli D. pharynx, larynx, trachea...
Sunday, February 2, 2014 at 5:11pm

Science
Name the components of the respiratory system in the order incoming air would encounter them during breathing. A. trachea, pharynx, larynx, alveoli, bronchi B. bronchi, larynx, alveloi, trachea, pharynx C. larynx, trachea, bronchi, pharynx, alveoli D. pharynx, larynx, trachea...
Sunday, February 2, 2014 at 3:49pm

science
http://www.google.com/webhp?source=searc​h_app#q=Extraction+of+copper
Sunday, February 2, 2014 at 12:40pm

Computer Science
def jumpAndBackpedal(isMyNumber): ''' isMyNumber: Procedure that hides a secret number. It takes as a parameter one number and returns: * -1 if the number is less than the secret number * 0 if the number is equal to the secret number * 1 if the number is greater ...
Sunday, February 2, 2014 at 8:14am

science
Extraction of copper
Sunday, February 2, 2014 at 4:27am

Course Help meeee
All or just one what? If you enroll in pre-med, curricula differ somewhat on where you enroll and where you hope to get into med school. You will take courses (note plural) in biology, chemistry, math, the usual social science, history, English, etc. At many schools that takes...
Sunday, February 2, 2014 at 12:26am

science
What is energy reformation? I Googled the term and didn't find anything useful.
Saturday, February 1, 2014 at 9:33pm

Science
1. A clementine in my fridge is covered with a nice blue-green lawn of mold, a common decomposer. Assuming that the clementine did not dry out, what do you predict is the weight of the clemintine and mold together compared to the starting weight of the clementine and WHY? 2. ...
Saturday, February 1, 2014 at 9:26pm

science
Where can I find information on Energy reformation for a middle school student to understand?
Saturday, February 1, 2014 at 9:20pm

science
Ws = 0.08m^3 * 7840kg/m^3 * 9.8=6147 N. = Wt. of the steel in air. Ww=0.08m^3 * 1000kg/m^3 * 9.8 = 784 N. = Wt. of the water displaced. Ws in water = 6147 - 784 = 5363 N.
Saturday, February 1, 2014 at 8:28pm

science
Work = F*d = mg*d = 210 * 7 = 1470 J.
Saturday, February 1, 2014 at 6:26pm

physical science
work = m g h = 70 * 9.81 * 2.2 joules power = work in Joules /time in seconds = 70 * 9.81 * 2.2 / 1.2 in Joules per second which is WATTS
Saturday, February 1, 2014 at 6:20pm

physical science
a weigh lifter raises a 70-kg barbell from the floor to a height of 2.2 m in 1.2s what was his average power output during the lift?
Saturday, February 1, 2014 at 5:54pm

College science
Do you have answers. If you checked my last answer and it was right you can look at this one. X = distance = Vo*t + 1/2*g*t^2 Vo is 0 and the mass of the pick (piton) doesn't matter. X = 295 m, solve for t = time to strike the ground. Then use V = Vo + g*t. Again, Vo is 0.
Saturday, February 1, 2014 at 4:52pm

College science
Im in Chem. but looks like physics.. If a rock climber accidentally drops a 70.5 g piton from a height of 295 meters, what would its speed be just before striking the ground? Ignore the effects of air resistance.
Saturday, February 1, 2014 at 4:34pm

science - gas chromatography
well, the manual says we have to plot area and also to plot peak height. but i was also looking into plotting it as chart distance but not quite sure how that works
Saturday, February 1, 2014 at 4:14pm

Science
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite B? 2. A common characteristic of mountains formed by two colliding continents is marine _______ rock. A. sedimentary B. metamorphic C. limestone D. igneous A...
Saturday, February 1, 2014 at 3:54pm

SCIENCE
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite A? 2. All the processes that form mountain ranges are known as A. arch vibrations. B. compressive forces. C. orogeny. D. island arcing. C? 3. _______ describes...
Saturday, February 1, 2014 at 3:39pm

physical science
V = Vo + g*t = 0 @ max ht. Vo - 9.8*4.24 = 0 Vo = 41.55 m/s. = Initial velocity, up. = Final velocity, down.
Saturday, February 1, 2014 at 3:30pm

science - gas chromatography
Since the chromatogram reads in amout on the vertical axis and time on the horizontal axis, how else would you measure it?
Saturday, February 1, 2014 at 3:00pm

Science
http://www.windows2universe.org/earth/At​mosphere/mesosphere.html
Saturday, February 1, 2014 at 2:43pm

Science
Can someone define mesosphere (mantle)- Upper and lower?
Saturday, February 1, 2014 at 2:35pm

science
Write a balanced equation to describe the following reactions: a) C14H30 is cracked to produce ethene, hydrogen and one other compound b) C16H34 is cracked to produce ethene and propene in a 2:1 ratio and only one other compound
Saturday, February 1, 2014 at 2:31pm

SICK ???
If this is your post, has NOT been ignored. Didn't you see Writeacher's response? http://science.howstuffworks.com/innovat​ion/edible-innovations/energy-drink.htm
Saturday, February 1, 2014 at 2:25pm

Science
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite A? 2. All the processes that form mountain ranges are known as A. arch vibrations. B. compressive forces. C. orogeny. D. island arcing. C? 3. _______ describes...
Saturday, February 1, 2014 at 2:20pm

Biology/Science
1. A corn plant over the course of a summer can weigh 500 grams (dry biomass, after removing the water), yet it starts from a seed that weighs less than 1 gram. What is the primary source of this increased mass? What process(es) are responsible for the gain in mass? Explain. 2...
Saturday, February 1, 2014 at 1:56pm

science - gas chromatography
why is retention and peak width measured in time? is there a better theoretical parameter?
Saturday, February 1, 2014 at 1:53pm

science
L = Lo + a/oC(T-To)*Lo L = 0.125 + 1.9*10^-6(100-200)0.125 = 0.124976
Friday, January 31, 2014 at 10:35pm

Engineering science N4
Distance = Vo^2*sin(2A)/g = 12000 m 700^2*sin(2A)/9.8 = 12000 50000*sin(2A) = 12000 sin(2A) = 12000/50000 = 0.240 2A = 13.9o A = 6.94o
Friday, January 31, 2014 at 9:40pm

science
. An ice cube of 48.7 grams is just beginning to melt. It is dropped into a swimming pool with a temperature of 26.0 ºC. How much heat will the ice cube absorb from the water in the swimming pool?
Friday, January 31, 2014 at 1:59pm

science
We need to have the specific problems along with your answers before anyone can check them you.
Friday, January 31, 2014 at 12:32pm

science
Can someone help me with mechanics. I need to check my answers
Friday, January 31, 2014 at 12:12pm

science
A car with a mass of 2.000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second. The curve has a radius of 80 meters what is the centripetal force on the car A.625N B.703N c. 15,625N D.20,250N
Friday, January 31, 2014 at 11:38am

science
In which of the following units is acceleration expressed a.Newton b.foot-pound
Friday, January 31, 2014 at 11:00am

science
Earth is a satellite because it moves around the sun.
Thursday, January 30, 2014 at 11:47pm

science
The Earth is a satellite of the sun? If not can you tell me what it is?
Thursday, January 30, 2014 at 11:19pm

science
A steel block has a volume of 0.08m3 and a density of 7,840kg/m3 what is the force of gravity acting on the block(the weight in water?
Thursday, January 30, 2014 at 11:12pm

science
An object with a mass of 21 kilograms is lifted through a distance of 7 meters. How much work is done A. 147j B.703n c.15,625N
Thursday, January 30, 2014 at 9:18pm

Science
A stone falls from a ledge and takes 16 seconds to hit the ground. the stone has an original velocity of 0 m/s how tall is the ledge
Thursday, January 30, 2014 at 9:14pm

6th grade honor science
secondary consumer
Thursday, January 30, 2014 at 9:12pm

6th grade honor science
organic?
Thursday, January 30, 2014 at 9:07pm

6th grade honor science
that didn't really help can you possibly give the answer cause I cant understand it
Thursday, January 30, 2014 at 9:06pm

6th grade honor science
http://www.enchantedlearning.com/subject​s/foodchain/
Thursday, January 30, 2014 at 8:59pm

6th grade honor science
having trouble with this question it was fill in the blank it was In a food web, an organism that eats an animal is a blank consumer
Thursday, January 30, 2014 at 8:54pm

science
After experiment was done.
Thursday, January 30, 2014 at 7:22pm

Science
1) Mixtures have two or more substances... 2) Heterogeneous 3) Magnetic attraction 4) Evaporate I had the same quiz, those were the answers
Thursday, January 30, 2014 at 7:21pm

science
What above experiment? I have no idea what you're talking about. It must have been some kind of experiment in which a gas was involved.
Thursday, January 30, 2014 at 7:16pm

science
If the student opened the bag after the above experiment, what would happen to volume of gas inside? A. The volume of gas in the bag will stay the same. B. the volume of gas in the bag will be decrease. C. The volume of gas in the bag will be increase. D. the volume of gas in ...
Thursday, January 30, 2014 at 7:11pm

Science
You're welcome.
Thursday, January 30, 2014 at 6:54pm

help me with this language arts.
Multiple Choice 1. A court order that integrated the schools in a city would (1 point) bring students of different races together. close down the schools. keep students of different races apart. 2. Read the following passage from Through My Eyes: After the first day, I was ...
Thursday, January 30, 2014 at 6:22pm

Science
Oh ok good. Thanx again!
Thursday, January 30, 2014 at 6:19pm

Science
Right.
Thursday, January 30, 2014 at 6:19pm

Science
Does anybody know?
Thursday, January 30, 2014 at 6:18pm

Science
Which of the following shows the correct order from coldest to hottest average annual temperature? a. Taiga-Tundra-Rainforest-Temperate forest b. Rainforest-Temperate forest-Taiga-Tundra c. Temperate forest-Taiga-Tundra-Rainforest d. Tundra-Taiga-Temperate forest-Rainforest*
Thursday, January 30, 2014 at 6:10pm

Science
You're welcome.
Thursday, January 30, 2014 at 6:04pm

Science
Yay! Thanx!
Thursday, January 30, 2014 at 6:02pm

Science
Right.
Thursday, January 30, 2014 at 6:02pm

Science
Which of the following determines the type of biome classification that will be made for a particular reason? a. Climate* b. Size c. Mineral deposits d. Number of human settlements
Thursday, January 30, 2014 at 6:01pm

math
Could you also help me with these? I know it's a lot but I'm stuck. Thank you! 3. Doug needs to purchase four sheets of marinegrade plywood to make repairs on the roof of his garage. Depending on the type of tree used to make the wood, the cost of the plywood is ...
Thursday, January 30, 2014 at 4:13pm

Science
We do not do your homework for you. Although it might take more effort to do the work on your own, you will profit more from your effort. We will be happy to evaluate your work though. Look up each of those terms in your text or Google them.
Thursday, January 30, 2014 at 3:44pm

science
D
Thursday, January 30, 2014 at 3:41pm

8th grade science
bbvccxzzd xxcvv g
Thursday, January 30, 2014 at 3:27pm

science
0ºC = 273ºK 600K - 273K = 327C Do you have a typo?
Thursday, January 30, 2014 at 3:27pm

science
agree
Thursday, January 30, 2014 at 3:17pm

science
Northwestern is NOT the name of your school subject,
Thursday, January 30, 2014 at 3:15pm

Science needs help
Indicate your specific subject in the "School Subject" box, so those with expertise in the area will respond to the question.
Thursday, January 30, 2014 at 3:14pm

science
http://www.agprofessional.com/agprofessi​onal-magazine/GM-food-production-increas​ing-169514076.html
Thursday, January 30, 2014 at 3:13pm

science
I think c
Thursday, January 30, 2014 at 3:05pm

Science
I'm thinking you're guessing. This starts out to be a limiting reagent problem. 2H2 + O2 ==> 2H2O mols hydrogen = grams/molar mass = about 2/2 = about 1. mols oxygen = 16/32 = 0.5 mol. Using the coefficients in the balanced equation, convert mols each to mols ...
Thursday, January 30, 2014 at 3:00pm

science
Provide at least two modern examples of how the United States has increased its food production.
Thursday, January 30, 2014 at 2:59pm

science
in a gasoline engine, the area in the cylinder head where the air-end and-fuel mixture is burned is called the A. piston B. cylinder c. combustion chamber D. intake valve
Thursday, January 30, 2014 at 2:57pm

Science
Pentane doesn't have hydrogen bonding as does 1-butanol.
Thursday, January 30, 2014 at 2:39pm

science
Actually liquid alcohol has a vapor pressure even at room temperature; however, I think the spirit of the question calls for answer A.
Thursday, January 30, 2014 at 2:28pm

physical science
A rock thrown straight up climbs for 4.24 s, then falls to the ground. Neglecting air resistance, with what velocity did the rock strike the ground?
Thursday, January 30, 2014 at 2:12pm

science
liquid alcohol will change to vapor when its temperature reaches the A. boiling point B. fusing point C. freezing point D. melting point
Thursday, January 30, 2014 at 2:07pm

Science
Does ΔT from evaportation increase or decrease with increasing molecular mass? Explain why?
Thursday, January 30, 2014 at 2:07pm

Science
Predict change in temperature for 1-butanol, CHSCH2CH2CH2OH, if same experiment were using 1-butanol?
Thursday, January 30, 2014 at 2:07pm

Science
Using concept of Surface Tension, explain why does the detergent cause the effect observed?
Thursday, January 30, 2014 at 2:05pm

Science
Explain why pentane has a significantly higher vapor pressure than 1-butanol?
Thursday, January 30, 2014 at 2:02pm

science
a silver bar 0.125 meter long is subjected to a temperature change from 2oo degrees celsius to 100 degrees Celsius what will the length of the bar be after the temperature change
Thursday, January 30, 2014 at 1:59pm

science --- check my answers!
omg, yes!!! Thank you so much Steve!!!!!:)
Thursday, January 30, 2014 at 1:54pm

science
If the absolute temperature of gas is 600K, the temperature in degrees celsius is A.273 b.705c
Thursday, January 30, 2014 at 1:51pm

science --- check my answers!
all looks good. Maybe #10 could also check (B), since boiling would drive off the water even faster than just evaporation.
Thursday, January 30, 2014 at 1:50pm

Science-check my answers plz
1 & 2 are right, but number three is freshwater ecosystem (i go to connections academy too)
Thursday, January 30, 2014 at 1:37pm

science --- check my answers!
help pls asap!!!!! check my answers!!! 4.) A certain object has a volume of 25.0 mL and a mass of 100g. What is the density of the object? a)0.250 g/mL b) 4.00/mL*** c)125 g/mL d) 2500 g/mL 5.)Which of the following is a chemical property of aluminum? a)The melting point of ...
Thursday, January 30, 2014 at 1:22pm

Science-check my answers plz
Which of the following explains why sunlight is important to aquatic ecosystems? Sunlight provides a source of heat energy to increase water temperatures. Sunlight keeps harmful bacteria from taking over aquatic ecosystems. Sunlight makes it possible for aquatic predators to ...
Thursday, January 30, 2014 at 12:47pm

Science
A SOLID has a definite shape and a definite volume.
Thursday, January 30, 2014 at 12:24pm

Science
What is the mass of water that results from combining 2.0 g of hydrogen with 16.0 g of oxygen? 14.0 g (I'm thinking this.) 16.0 g 18.0 g 20.0 g
Thursday, January 30, 2014 at 11:36am

science
By the way, if the ship had a hole in the bottom, so that it filled with water, it would sink just like the nail.
Thursday, January 30, 2014 at 10:58am

science
Archimedes says: Force up on ship or nail - weight of water displaced which is density of water times g times VOLUME OF WATER DISPLACED. In the case of the ship, assuming it is not full of water, the volume of water displaced includes the volume of the inside of the hull which...
Thursday, January 30, 2014 at 10:57am

science
Hey, many of these are trivial and I am sure you do not need our help with them. Please just post the ones you are having trouble with and show your attempt at solutions.
Thursday, January 30, 2014 at 10:54am

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