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July 23, 2014

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Recent Science Questions

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statistics
The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The results were as follows. (Give your answers correct to two decimal places.) x 7 6 9 11 11 5 14 8 ...
Friday, November 1, 2013 at 3:41am

Science
If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look? a. in the section for the Ordovician period of the Paleozoic era. b. in the section for the Quaternary period of the Cenozoic era. c. in the section for the Triassic ...
Friday, November 1, 2013 at 12:14am

science
Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 4.8-kg projectile from rest to a speed of 3.9 103 m/s. The net force accelerating the projectile is 4.8 105 N. How much time is...
Friday, November 1, 2013 at 12:00am

Science
Which of the following is a disadvantage of external fertilization. a) gametes are released into the surroundings b) gametes are washed away c) the developing zygote is protected d) large number of eggs can be produced at one time
Thursday, October 31, 2013 at 7:26pm

English
He won first prize for the solar lamp in the science fair. (What is the meaning of 'for' in the sentence? Is 'for the solar lamp' an adjective phrase modifying 'prize' or and adverbial phrase modifying 'won'?)
Thursday, October 31, 2013 at 6:14pm

Science
Determine the frequency of a microwave 6.0 cm in length.( A microwave is an electromagnetic wave.It travels through space at a speed of 3.0 x 10 ^8 m/s)
Thursday, October 31, 2013 at 5:44pm

Science >.<
if a wave is traveling at 60cm/second and has a wavelength of 15cm what is the frequency? Please explaine
Thursday, October 31, 2013 at 5:31pm

Science question
What would happen to the current model of the atom if new information about it’s structure is discovered in the future? Would it be revised, strengthened,proven or defended?
Thursday, October 31, 2013 at 5:27pm

soicalstudies
before I start I wanna say I don't known of this and don't have a book help ----------------------------------------​------------------ 1.greece's economy prospered thanks to A.the arts B.philosophy C.trade D.architecture...
Thursday, October 31, 2013 at 5:22pm

Science
When you inhale, where is there more oxygen, in the lungs or body.
Thursday, October 31, 2013 at 5:08pm

Science
If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look? a. in the section for the Ordovician period of the Paleozoic era. b. in the section for the Quaternary period of the Cenozoic era. c. in the section for the Triassic ...
Thursday, October 31, 2013 at 3:56pm

Science
After a rock layer is eroded, which additional event must occur to create an unconformity, or a gap in the geologic record? a. an earthquake or motion along a fault. b. new deposits of sediment must build up on the eroded area. c. folding of sedimentary rock layers. d. a ...
Thursday, October 31, 2013 at 12:57pm

Science
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
Thursday, October 31, 2013 at 11:17am

Science (urgent!)
Three characteristics of friction force and surface type. Three characteristics of friction force and mass. Three characteristics of friction force and surface area. I don't quite understand what they mean by characteristics, or what they want me to do. Could I please get ...
Thursday, October 31, 2013 at 9:32am

Science
Is a cucumber a fruit or a vegetable?
Thursday, October 31, 2013 at 6:53am

science
The two tables below give the relative-risk of developing a stroke, in relation to blood pressure and body mass index. The data are based on a population of men from the USA. The values in the first table are given in comparison with the total population. The values in the ...
Thursday, October 31, 2013 at 6:21am

science please help
Sources and uses for the following: Radio waves Microwaves Infrared Waves Visible Light Waves Ultraviolet Waves X-Rays Gamma rays
Wednesday, October 30, 2013 at 10:53pm

Science
Fill in the blank- The gravitational force between two objects is proportional to the ______ of the masses of the objects.
Wednesday, October 30, 2013 at 10:05pm

Science
List: Three characteristics of friction force and surface type. Three characteristics of friction force and mass. Three characteristics of friction force and surface area.
Wednesday, October 30, 2013 at 9:40pm

Science
Under which of the following conditions would a fossil most likely form? a. a living thing dies and sediment is very slowly deposited on top of its body b. a living thing dies and sediment quickly covers its body* c. a living thing dies and its skeleton is left exposed to the ...
Wednesday, October 30, 2013 at 8:57pm

science
----- major tenet of janaist faith, it is the avoidance of violent actions
Wednesday, October 30, 2013 at 7:27pm

science
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
Wednesday, October 30, 2013 at 7:18pm

Science
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
Wednesday, October 30, 2013 at 5:30pm

Science
How do I prepare for a Field Study? I really need to know.
Wednesday, October 30, 2013 at 5:04pm

Science
Posted by Cassie on Wednesday, October 30, 2013 at 3:39pm. What percentage of the total land area is available for mans use, living and agriculture/farming? A. 9.38% *B. 3.13% *C. 12.51% D. 75% I'm not sure if it is B or C. Thank You.
Wednesday, October 30, 2013 at 4:59pm

Science
What process involves the comparison of rock layers with others in a sequence to determine its age? radioactive decay radiometric dating relative dating absolute dating To determine the most accurate and precise age of Earth's oldest rocks, geologists would use relative ...
Wednesday, October 30, 2013 at 4:51pm

Science
Find a weather repot that references a current
Wednesday, October 30, 2013 at 4:23pm

Science 😆
I need help finding a weather report that references a current .
Wednesday, October 30, 2013 at 4:12pm

Science
What percentage of the total land area is available for mans use, living and agriculture/farming? A. 9.38% *B. 3.13% *C. 12.51% D. 75% I'm not sure if it is B or C. Thank You.
Wednesday, October 30, 2013 at 3:39pm

science
in which of the following phases of the moon are you able to see the most surface area? a) new moon b) waxing crescent c) waxing gibbous d) waning crescent
Wednesday, October 30, 2013 at 1:24pm

Science
Why is it rare for the soft parts of an organism to become a fossil? A. the soft parts take a long time to decay. B. the soft parts can be eaten by other animals.* C. the soft parts cannot be buried in sediment. D. the soft parts form petrified fossils.
Wednesday, October 30, 2013 at 1:21pm

science
during which phase is the least percentage of the light that hits the moon visible from earth? a) new moon b) waxing gibbous c) waning crescent d) full moon
Wednesday, October 30, 2013 at 12:26pm

Science
What percent of water is not easily accessible or usable on earth? *A. .6% B. 12.5% C. 50% D. 99% Subtract the answer from the last question from 100%. What does the remainder represent and what are the sources of this percentage of water? A. 97% rivers only B. 1% lakes, ...
Wednesday, October 30, 2013 at 12:19pm

science
which type of eclipse would you expect to see if the moon passes directly between earth and the sun? a) a solar eclipse b) a lunar eclipse c) a total lunar eclipse d) a penumbra
Wednesday, October 30, 2013 at 12:18pm

science
How does gravity affect the moon? a) it pulls the moon toward earth b) it pushes the moon away from earth c) t allows the moon to move in a straight line d) it keeps the moon from colliding with the sun
Wednesday, October 30, 2013 at 10:08am

science
why does the sun appear to move westward across the sky during the day? a) because earth rotates to the east b) because earth rotates to the west c) because the sun moves in a westerly direction d) because of the way you are looking into the sky
Wednesday, October 30, 2013 at 8:26am

science
which of the following statements best describes the biosphere? a) it is a mixture of gases that contain dust particles b)it contains earths metal core c) it contains all of earths water d) it it the part of earth that contains living organisms is it d ?
Wednesday, October 30, 2013 at 8:24am

science
which of the following statements best describes the biosphere? a) it is a mixture of gases that contain dust particles b)it contains earths metal core c) it contains all of earths water d) it it the part of earth that contains living organisms is it d ?
Wednesday, October 30, 2013 at 8:09am

Science Project Help?
I have this project: The length of a football field is 100 yards. When you compare geologic time (4.6 billion years) to the length of a football field, you will find that each yard on the field will equal 46 million years, and each 10-yard section will equal 460 million years...
Wednesday, October 30, 2013 at 12:06am

science help plzzz
Multiple Choice 1. At the chromosomal level, what is the difference between human males and human females? (1 point) All males have a Y chromosome, and females do not. All males have an X chromosome, and females do not. All males have 47 chromosomes, and females only have 46. ...
Tuesday, October 29, 2013 at 11:54pm

Science
How much force is needed to make a 60 kg object accelerate at a rate of 2.0 m/s^2?
Tuesday, October 29, 2013 at 9:14pm

science
A hockey puck sliding on a frozen lake comes to rest after traveling 272 m. If its initial velocity is 3 m/s, what is its acceleration (assumed constant)? Answer in units of m/s2
Tuesday, October 29, 2013 at 8:56pm

Science
What is the definition for the word friction?
Tuesday, October 29, 2013 at 8:07pm

Science
Explain what acids and bases are in terms of hydrogen ions. Which has more hydrogen ions and which has less?
Tuesday, October 29, 2013 at 6:35pm

science
if all of the following imaginary planets were the same distance from the sun, which would experience the strongest force of gravity due to the sun? planet a: mass 3,500 kg planet b: mass 50,000 kg planet c: mass 750 kg planet d: mass 100,000 kg a)planet a b) planet b c) ...
Tuesday, October 29, 2013 at 2:59pm

science
which of the following would happen to the moon if gravity no longer affected it ? a) the moon would continue to move on it's orbital path b) the moon stop moving all together c) the moon would move in a spiral toward earth d) the moon would move in a straight line
Tuesday, October 29, 2013 at 2:53pm

science
During standardization of permanganate solution using sodium oxalate, can the titration between Mno4- and C2o42- at 25degree celcius be perform? state the reasons.
Tuesday, October 29, 2013 at 8:17am

science
urgent- A 2200kg truck accelerates at 15m/s2(squared). What is the net force on the truck? What is the acceleration of the truck?
Monday, October 28, 2013 at 10:22pm

Materials Science
A long 0.6 m OD ANSI 347 stainless steel (use k=15.8 W/mK) cylindrical billet at 290 degrees C is placed into cooling chamber where the temperature is 30 degrees C. If the average heat transfer coefficient is 170 W/m^2K, estimate the time in minutes required for the center ...
Monday, October 28, 2013 at 9:32pm

science need help Ms. sue
What are the materials I need for my science project. my science project is "How does stress affect your body"
Monday, October 28, 2013 at 8:52pm

Science - Newton
How did Isaac Newton affect the Heliocentric Theory?
Monday, October 28, 2013 at 8:31pm

Bio/science
what are some Echinodermata examples of a representative species for a taxon
Monday, October 28, 2013 at 7:37pm

Computer Science
Suppose X is a random variable and Y = aX + b is a linear function of X. Show that the correlation of X and Y is -1 if a < 0. cor(X,Y) = cov(X,V)/ sqrt(var(X)*var(Y))
Monday, October 28, 2013 at 5:34pm

Bio/Science PLEASE HELP
If the axo-membrane becomes more permeable to potassium ions.. Which onewould be true? A. the inside of the membrane will become more positively charged. B. the membrane will depolarize rapidly. C. it will take a stimulus of larger magnitude to initiate an action potential. D...
Monday, October 28, 2013 at 5:33pm

BIO/SCIENCE
If the axo-membrane becomes more permeable to potassium ions.. Which onewould be true? A. the inside of the membrane will become more positively charged. B. the membrane will depolarize rapidly. C. it will take a stimulus of larger magnitude to initiate an action potential. D...
Monday, October 28, 2013 at 4:31pm

Science
a scientist crosses a plant with red flowers and a plant with white flowers. The off spring will most likely have a) red flowers b) white flowers c) pink flowers d) red flowers with white patches
Monday, October 28, 2013 at 2:27pm

Earth and Environmental Science
The solar wind can be thought of as evidence for which theory of light?
Monday, October 28, 2013 at 2:21pm

science
a scientist is studying a new chemical hopes will prevent insects from eating raspberry bushes. He sprays the chemical on a raspberry bush and places it with an unsprayed blackberry bush and some insects in a sealed room. he objectives insects eating the blackberry bush, but ...
Monday, October 28, 2013 at 1:10pm

Science
Which of the following statements best summarizes the Seafood Print research discussed in your text?
Monday, October 28, 2013 at 11:30am

SCIENCE
The intensity level of sound A is 5.0dB greater than that of sound B and 3.0dB less than that of C. Determine the ratio(Ic/Ib) of the intensity of sound C to that of B.
Monday, October 28, 2013 at 9:25am

science
OBJECTIVE: to find out which of two indicators, methyl orange or phenolphthalein, gives more reliable and consistent results in the titration of H3PO4 with NaOH. REQUIREMENT: (1). Phosphoric acid solution of unknown concentration. (2). Standard NaOH solution. (3). Methyl ...
Monday, October 28, 2013 at 5:55am

English
One of the Ig Nobel Prizes is the Prize for Bird Science. (What is the meaning of the preposition 'for'? Is 'for' 'concerning' or 'about'?)
Monday, October 28, 2013 at 5:42am

Earth Science (Geography)
In what way can the soils, geology and slopes affect river flow?
Monday, October 28, 2013 at 4:49am

Science
Which statement is true regarding nuclear energy?
Sunday, October 27, 2013 at 10:21pm

Science
Ribosome: protein synthesis: mitochondria: What comes next? a. cell support b. energy release (don't think so) c. nutrient storage (don't think so) d. protein transport
Sunday, October 27, 2013 at 9:25pm

Science
What plant cell organelle contains its own DNA and ribosomes?
Sunday, October 27, 2013 at 9:17pm

Science
For lunch, Jane Doe consumed the following: a turkey sandwich on whole wheat bread with mayonnaise, lettuce, and tomato; potato chips; and apple juice. 1.Trace the path of digestion through Jane from beginning to end. Include the nutrients the food contained and are broken ...
Sunday, October 27, 2013 at 9:11pm

Science
Why do the temperatures of land, air and water differ?
Sunday, October 27, 2013 at 8:19pm

6th grade science
How do the differences in teh way land and water absorb and release energy cause local winds?
Sunday, October 27, 2013 at 7:33pm

Science
Please help !!! A student wanted to determine the density of an object made of an unknown substance. She found the mass of the object was 335g. Then she did water displacement to determine the objects volume. The initial volume of the water was 50.0 mL. With the object ...
Sunday, October 27, 2013 at 6:56pm

Science-Galaxies
Arrange these in order from smallest to largest: Spiral Galaxies, Elliptical Galaxies, and Irregular galaxies. I know that Irregular Galxies are the smallest.
Sunday, October 27, 2013 at 6:51pm

Science
A rectangular brick measures 6cm by 9cm by 20cm and has a mass of 2.563 kilograms. What is the density of the brick in grams per cubic centimeter?
Sunday, October 27, 2013 at 5:52pm

science
1. You can catch mosquitoes using dry ice. 2. You can catch mosquitoes using ice cubes. (Which one is real?)
Sunday, October 27, 2013 at 5:22pm

science
Why scientists used only mice from the same pure-bred strain is so that
Sunday, October 27, 2013 at 4:53pm

Science: Galileo
What does Galileo's Dialogue of 2 Chief World Systems talk about?
Sunday, October 27, 2013 at 4:48pm

physical science
A girl on a bicycle drags a wagon full of newspapers at .80 m/s for 30 min. using a force of 40 N. How much work is done?
Sunday, October 27, 2013 at 3:46pm

science please help
When you are swimming underwater, what does it sound like when someone talks from the surface? Why does this happen? My answer- You can slightly make-out what they are saying.This happens because sound travels faster in water than in air.
Sunday, October 27, 2013 at 3:29pm

Science {Ms.Sue}
what is happening to sound waves as they enter different mediums? I believe that they decrease in sound and length.
Sunday, October 27, 2013 at 2:51pm

SCIENCE
How ionising radiation affect the cell, DNA and can lead to tumours /leukaemia? nothing too complex please note form will be fine, in which I can use it in my explanation. if you can please put it in your own words as I find it much easier to understand and explain in my ...
Sunday, October 27, 2013 at 1:36pm

science
How ionising radiation affect the cell, DNA and can lead to tumours /leukaemia? nothing too complex please note form will be fine, in which I can use it in my explanation. if you can please put it in your own words as I find it much easier to understand and explain in my ...
Sunday, October 27, 2013 at 1:16pm

Science
How would you write a method on a hypotheses relating to meaning in life and both physical and psychological well-being scores.
Sunday, October 27, 2013 at 12:32pm

Science- DrBob222
If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis? I have a graph with the vertical axis showing the percentage of radioactive element remaining. The values on the vertical axis are 0 (...
Saturday, October 26, 2013 at 11:50pm

Science
Suppose you found a fossil of a clam shell what can you conclude about the once-living organism and how it became a fossil?
Saturday, October 26, 2013 at 11:47pm

science
Explain the difference between a scientific theory an d scientific law.
Saturday, October 26, 2013 at 10:59pm

science
A child's top is held in place, upright on a frictionless surface. The axle has a radius of r= 2.21 mm. Two strings are wrapped around the axle, and the top is set spinning by applying T= 2.40 N of constant tension to each string. If it takes 0.830 s for the string to ...
Saturday, October 26, 2013 at 10:57pm

science
Explain what science is. Give an example of a type of scientist and what they study .
Saturday, October 26, 2013 at 10:25pm

science
In a dream you're in a car traveling at 50 km/h and you bump into another car traveling toward you at 48 km/h. The speed of impact is
Saturday, October 26, 2013 at 7:31pm

Science
Watershed's affect our environment because without watershed's we wouldn't be able to transport water to nearby lakes,streams, rivers, etc. The water comes from precipitation that falls on to a certain land called watershed and then drains the water to streams. ...
Saturday, October 26, 2013 at 3:40pm

Science
how does energy provided by the sun influence global weather patterns?
Saturday, October 26, 2013 at 3:33pm

science
how does the watershed affect our environment? please help a not to short answer thanks
Saturday, October 26, 2013 at 3:20pm

science
why do scientists use the international system of units(SI)? a) because the SI is based on the metric system b) because the tools scientists use only measures in SI units c) so they can communicate their results without confusion d) so all scientist are guaranteed to come up ...
Saturday, October 26, 2013 at 2:49pm

Science
How is earth like a system?
Saturday, October 26, 2013 at 11:51am

maths letaracy,history,geography and life science
im going to grade 10 next year,and i want to be a psychologist and im going for maths letaracy and history feild im realy not good with maths and i just found out a few weeks ago that i need pure maths to do psychology.i dont know what to do now ,i also dont know the jobs ...
Saturday, October 26, 2013 at 8:02am

English
Where did he get the idea for his project? 1. He got the idea from a science magazine. 2. He got the idea in a science magazine. (Which preposition should we use?)
Saturday, October 26, 2013 at 6:45am

environmental science
How to do panoramas to do natural disaster
Friday, October 25, 2013 at 11:27pm

environmental science
Natural disaster about flood
Friday, October 25, 2013 at 11:23pm

Physical Science
20. Why is ethanol added to gasoline? Can't find this answer in my book, and I've gone back and checked for it like three times. Please and thank you!
Friday, October 25, 2013 at 7:21pm

Science
How is Earth like a system?
Friday, October 25, 2013 at 6:10pm

GED
Is the English Writing test the most difficult GED test? I find Math easy. Am I required to memorize the Science and Social Studies? or will I be provided information and is the Science and Social Studies actually a reading test? Thank You in Advance.
Friday, October 25, 2013 at 4:10pm

physics (science)
John walks 1.0 km north, turns and walks 1.2 km at 50 degrees north of due east, and then turns and walks .8 km at 25 degrees north of east. what is the resultant distance and direction he has flown
Friday, October 25, 2013 at 3:23pm

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