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July 29, 2014

Homework Help: Science

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Recent Science Questions

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science
How many cups of water are needed for a plant to begin germinating?
Sunday, November 17, 2013 at 9:23pm

Help with Science
1. Which of the following is an example of an environmental pressure? A. The air pressure in the atmosphere. B. A lake that is gradually running out of water. C. A fight between two members of the same species. D. Breeding between two members of the same species.
Sunday, November 17, 2013 at 3:35pm

science
Calculate the Molar Enthalpy of Neutralization (ÄHn) in kJ/mol of the reaction between a monoprotic acid and a monoprotic base, given the following information: The temperature change equals 5.30°C, 50.0 mL of 1.00 M concentration of Acid 50.0 mL of 1.00 M ...
Sunday, November 17, 2013 at 3:33pm

science
How much heat is gained (in Joules) by the water (qwater) when a chemical reaction takes place in 100.0 mL aqueous solution and has a temperature increase of 13.26 °C? (Remember cwater = 4.180 J/°Cg)
Sunday, November 17, 2013 at 3:32pm

science
What is the Molar Enthalpy of Neutralization (ÄHn) in kJ/mol if 5.00 moles of HCl(aq) (acid) neutralized 5.00 moles of NaOH(aq) (base) and released 2033 J of heat?
Sunday, November 17, 2013 at 3:31pm

Science
Consider a c-Si solar cell whose fingers have a resistance R=10ohms. Which would be the finger´s resistance (in ohms) if the finger´s width is doubled and the finger´s height is one third of its initial value
Sunday, November 17, 2013 at 3:17pm

science
Balancing equations a) Mg + HCl --> MgCl2 + H2  b) K + H2O --> KOH + H2  c) Li + H2O --> LiOH + H2  d) Fe + O2 --> Fe2O3  Please help
Sunday, November 17, 2013 at 11:19am

science
what is the reason for building ponds the internet not saying
Sunday, November 17, 2013 at 9:57am

Science
A pelican flying along a horizontal path drops a fish from a height of 125 m while traveling 40 m/s. How far does the fish travel horizontally before it hits the water below?
Sunday, November 17, 2013 at 6:12am

Science (respiration)
Hello, I have a question. How does colour affect a mealworm's respiration? Do mealworms breathe more slowly when sleeping? Do mealworms stop breathing for a bit, then breathe again? Thank you, and just tell me what you know. If you only know the answer to one of these, ...
Saturday, November 16, 2013 at 11:16pm

Science (Physics)
On the moon, the acceleration due to gravity is only 1.6 m/s/s. If someone on earth can throw a baseball 24.2 m high, how high could she throw it on the moon?
Saturday, November 16, 2013 at 10:36pm

science
Chemistry Hey guys, i have a question about how to figure out how much mass of a compound i need to find 130ppm here is the question. What mass of Fe(NH4)2(SO4)2*6H2O is required to prepare 2.25 L of a 130 ppm iron solution? Now i know that ppm is (mg of desired compound)/(kg ...
Saturday, November 16, 2013 at 8:51pm

science
How can circuit voltage affect the choice of insulator? why does the resistance decreases as the conductor diameter increases? how does temperature effect resistance? please help and thank you
Saturday, November 16, 2013 at 7:59pm

Science
Balancing equations a) Mg + HCl --> MgCl2 + H2 b) K + H2O --> KOH + H2 c) Li + H2O --> LiOH + H2 d) Fe + O2 --> Fe2O3 Please help
Saturday, November 16, 2013 at 3:34pm

Science
What substances (Syrup or water) absorb more thermal energy? Why?
Saturday, November 16, 2013 at 1:58pm

Science
Balancing equations a) Mg + HCl --> MgCl2 + H2 b) K + H2O --> KOH + H2 c) Li + H2O --> LiOH + H2 d) Fe + O2 --> Fe2O3 Please help
Saturday, November 16, 2013 at 1:47pm

science10
will need help with science 10
Saturday, November 16, 2013 at 11:19am

science / rocks
what step in the rock cycle creates the sediment from which sedimentary rocks form I think its erosion please see if im right or not
Friday, November 15, 2013 at 7:36pm

SCIENCE / ROCKS
what are rocks made up of ?
Friday, November 15, 2013 at 7:28pm

Earth space science, check answers?
A. 75 % B. 12.5% C. 25% D. 3.13% E. 9.38% 3. what percentage of land on the earths surface is inhospital lands? - B 4. what percentage of earths surface is covered by land? - C 5. what percentage of land on earth is usable, for living on, but not for agriculture/farming?-D 6. ...
Friday, November 15, 2013 at 1:34pm

Science need help
Choose the words or phrases that most accurately complete the sentences below. One of the most effective measures that a government can undertake to reduce cardiovascular disease is to ………………..In​dividuals can also decrease their own risk of...
Friday, November 15, 2013 at 12:28pm

nature of science
four forces are being applied to move an object to the left. Force 1 is pushing to the right at 200N. Force 2 is pushing to the left at 500N. Force 3 is pushing to the right at 100N. Force 4 is pushing to the left at 50N. What's the net force acting on this object? A. 250N...
Friday, November 15, 2013 at 8:37am

nature of science
which of the following is Not part of testing a hypothesis? A. reasoning B. modeling D. gathering evidence
Friday, November 15, 2013 at 8:31am

nature of science
which of the following best explains velocity? A.the speed & direction of an object in motion C.only the change of direction of an object in motion D.the direction of an object in motion
Friday, November 15, 2013 at 8:29am

nature of science
Two objects or 5kg to 10kg respectively and they're 10m apart. If the distance between them is increased to 20m, what happens to the gravitational force? A. it decreases B. it is doubled C. it increases slightly
Friday, November 15, 2013 at 8:27am

nature of science
which of the following would increase friction. A.Soap B.water C. sand
Friday, November 15, 2013 at 8:22am

Social Science
I have to conduct a project that will be time consuming and costly and I need to justify to my principal investigator why he should approve the funding for this project.
Friday, November 15, 2013 at 7:03am

science
Calculate the time in seconds an Olympic Skier would take to finish a 5,000 meter race at an average velocity of 25 m/s downhill.
Friday, November 15, 2013 at 1:38am

science
What is the otter's acceleration if it increases its speed 3 m/s each second for 4 seconds
Friday, November 15, 2013 at 1:34am

Science
Darwin assumed that evolutionary change was always slow and gradual. What was the first evidence that suggested evolutionary change might happen fast sometimes? a. homologous structures b. fossils c. reproduction rates d. DNA sequences Which of the following provides evidence ...
Friday, November 15, 2013 at 12:45am

DE Science
I am thinking A. A scientist claims plants and animals that exhibit reproductive cycles based on the changing seasons are highly affected by climate change. What is the correct justification of the scientist's claims? A) Climate change can cause a timing mismatch of energy...
Thursday, November 14, 2013 at 10:43pm

Science! Biology 1
Question: Which of following best describes the free-energy requirements of an organism? Answer Choices: During times of hibernation large amounts of free energy are required. Free-energy demand is consistent for all heterotrophs. The organism requires free energy in all ...
Thursday, November 14, 2013 at 10:36pm

Chemistry, Science
How many Cl- ions are present in 2.35 mol of CaCl2 and please show steps ! Need help so I can study for a huge test tomorrow
Thursday, November 14, 2013 at 8:39pm

Science
Darwin assumed that evolutionary change was always slow and gradual. What was the first evidence that suggested evolutionary change might happen fast sometimes? a. homologous structures b. fossils c. reproduction rates d. DNA sequences Which of the following provides evidence ...
Thursday, November 14, 2013 at 6:50pm

Earth space science
I need help with this. the map doesnt show anything and idk how to post the map on here... Match the cities A,B,C, and D with the weather description of the surface model (To the right of each letter) a. city A b. City B c. City C d. City D A. Pressure of 1015.1 and south east...
Thursday, November 14, 2013 at 1:10pm

Science
How do I find a research question, sample size method of analysis , major findings in an article titled: Ethical challenges in the design and conduct of locally relevant international health research
Thursday, November 14, 2013 at 12:26pm

science
if a number is not an irrational number then it is s) a rational number b) a integer c) a whole number
Thursday, November 14, 2013 at 12:22pm

science
What can be inferred after performing the experiments in the Atomic Theory lab?
Thursday, November 14, 2013 at 11:18am

science
Why did the following change occur ? The snow that covered the ground all winter began to melt,temperature rose, and flowers started to bloom. a) days became shorter b) earth's tilt on its axis shifted. c) the sun's rays became more concentrated d) Earth completed one ...
Wednesday, November 13, 2013 at 10:09pm

8th grade science
Q: A person living in North America will be able to see 15 lunar eclipses in the 2010-2020 decade. In the same time period, only two solar eclipses can be observed in North America. why will more lunar eclipses than solar eclipses be visible from North America in this decade? ...
Wednesday, November 13, 2013 at 9:59pm

Math/Science
An ocean liner is traveling at 5m/s. A passenger on deck walks towards the rear of the ship at a rate of 4m/s. After walking 30 meters, he turns right and walks at a rate of 4m/s to the rail, which is 12 meters from his turning point. What is his velocity relative to the water...
Wednesday, November 13, 2013 at 9:25pm

science
Ways to group plants? Evergreen, seeds,...
Wednesday, November 13, 2013 at 8:55pm

science
By __________,a child's parent's pass on their ____________, which carry instructions for some____________ the child will have.
Wednesday, November 13, 2013 at 8:52pm

science
what is wrong with the statement "you look exactly like your mother"
Wednesday, November 13, 2013 at 8:48pm

Science
psychologists should not prescribe medicine? What are good factors to talk about explaining this in an essay
Wednesday, November 13, 2013 at 7:28pm

Science
what are 4 places where convection is important in a home? {I already have the air conditioner}
Wednesday, November 13, 2013 at 6:47pm

science
tides are caused by the force of inertia from the sun and moon acting on Earth. true or false
Wednesday, November 13, 2013 at 6:08pm

Science
Which of the following would not be useful in determining the age of a fossil? a. Radiometric dating of the rock containing the fossil. b. Relative dating of the layers surrounding the fossil. c. Identification of fossils of known age found near the fossil in question. d. ...
Wednesday, November 13, 2013 at 5:17pm

Science
Which of the following occurs during artificial selection but not natural selection? a. Selection pressures result in only certain traits from a population being passed on to offspring. b. Traits are passed to offspring through genes. c. Males and females mate and produce ...
Wednesday, November 13, 2013 at 4:57pm

Science
Over millions of years of time, an island's vegetation shifts. The seed-producing plants that dominated the early origins of the island die out in favor of new species of plants that do not produce seeds but provide a good habitat for insects. How is this change likely to ...
Wednesday, November 13, 2013 at 4:45pm

Science
Which of the following explains how natural selection leads to evolution? a. Conditions in the environment reduce competition for resources within a species. b. Helpful variations accumulate among surviving members of the species. c. Overproduction provides food for stronger ...
Wednesday, November 13, 2013 at 4:34pm

science
why can you never see the far side of the moon from Earth ? a) because earth is spinning too quickly b) because it cannot be seen during daylight hours c) because the moon rotates once on its axis in the same time that it takes to revolve around earth d) because the moon does ...
Wednesday, November 13, 2013 at 3:21pm

science
which of the following is the smallest conceivable amount of time that could pass between a lunar eclipse and a solar eclipse ? a) about 14 days b) about 28 days c) about 183 days d) about 365 days
Wednesday, November 13, 2013 at 3:15pm

science
which of the following descriptions of the moon's surface is accurate? a) the moon's surface is wet and smooth b) the moon's surface is dry and irregular c) the moon's surface has mountains and oceans d) the moon's surface is exactly like Earth's surface
Wednesday, November 13, 2013 at 3:12pm

SCIENCE
how can I transcibe this into mRNA? DNA- T A C G A C T A A C G T C A G T A G
Tuesday, November 12, 2013 at 10:00pm

Physical Science
17. Why can't carbon-14 be used to determine the age of fossils that are several hundred thousand years old? Please and thank you!
Tuesday, November 12, 2013 at 7:56pm

Science help!!!
Describe the evidence that supported the hypothesis of Continental Drift.
Tuesday, November 12, 2013 at 7:32pm

science
What is the height (in miles) for a ( television satellite to be placed above the equator of Earth to rotate at the same speed as Earth and be able to relay pictures that have been beamed to it back to another place?
Tuesday, November 12, 2013 at 6:02pm

physical/earth science
what important nonmetal is in brilliant yellow acrylic paint that contains titanium dioxide
Tuesday, November 12, 2013 at 5:54pm

science
if there is 63 protons,89 neutronsand 60 electrons so what is his net charge
Tuesday, November 12, 2013 at 5:27pm

computer science
Does anyone know Access 2010 queries criteria? I have a specific question...
Tuesday, November 12, 2013 at 4:10pm

Earth and Environmental Science
How much does the amplitude of the waves increase between an earthquake that measures 4.2 on the Richter scale and an earth quake that measures 6.2 on the Richter scale?
Tuesday, November 12, 2013 at 2:09pm

Science
In DNA fingerprinting, the DNA probe that is used is ______to the DNA sequence of the repeats in the sample? im guessing amplify????
Tuesday, November 12, 2013 at 1:57pm

science
ok this is juist the first question.... 1)When evolution was first proposed, which of the following was used as evidence to support the idea? A)observations of nature B)laboratory experiments C)extensive fossil collections D)genetic sequences plzz help!!!!
Tuesday, November 12, 2013 at 10:33am

7th grade science
I'm not sure if I can post my question about science. Can I post it? I don't know if it'll get taken off
Monday, November 11, 2013 at 9:32pm

Science
Which experimental approach would be most effective and easiest to clearly determine the evolutionary relationship between these two organisms? a. sequence the same gene in both species to compare their similarity. b. dissect specimens of both species to look for homologous ...
Monday, November 11, 2013 at 8:37pm

science
During road construction a section of rock is cleared which contains many fossils each shovel of rock removed from the trench uncovers several fossils some of the fossils That are exposed include a prehistoric fish petrified wood water plant imprints and jawbone from a giant ...
Monday, November 11, 2013 at 7:22pm

Science
Which statement is true regarding nuclear energy? (Points : 1) Since 2005, global private investments in nuclear energy totaled $100 million dollars. Nuclear plants cost 2-3 times as much as new windpower to build. Nuclear energy currently produces 50% of the U.S.’s ...
Monday, November 11, 2013 at 5:39pm

Science
Which experimental approach would be most effective and easiest to clearly determine the evolutionary relationship between these two organisms? a. sequence the same gene in both species to compare their similarity. b. dissect specimens of both species to look for homologous ...
Monday, November 11, 2013 at 3:35pm

science
Identify a viewpoint from the text that highlights the importance of biodiversity. Do you believe every species is connected to one another, as expressed in the text? Why or why not? Give an example of a case where the extinction of one species might effect the life of another.
Monday, November 11, 2013 at 1:12pm

Science
13. If we used wave energy to produce electricity, which of the following would be a positive environmental benefit? A) We would have power to run lights on navigation buoys B) We would reduce the amount of fossil fuels used to produce electricity and reduce pollution. C) The ...
Monday, November 11, 2013 at 12:26pm

science
Earth titled axis affects the strength of sunlight in different places of earth's surface. If you are in an area that receiving less direct sunlight,where are you located? a) near the equator b) near the north pole c) near the south pole d) near the north or south pole
Monday, November 11, 2013 at 11:49am

Science
Which experimental approach would be most effective and easiest to clearly determine the evolutionary relationship between these two organisms? a. sequence the same gene in both species to compare their similarity. b. dissect specimens of both species to look for homologous ...
Monday, November 11, 2013 at 10:46am

science
erosion and weathering are examples of which type of forces ? a) constructive forces b) destructive forces c) gravitational forces d) inertia-related forces
Monday, November 11, 2013 at 9:57am

science
what do angiosperms reproduce with??/
Monday, November 11, 2013 at 8:56am

science
how would the length of a day be affected if all the world's inhabitants continuously walked in an easterly direction? when they stopped walking?
Monday, November 11, 2013 at 4:07am

science
when a long-range cannonball is fired towards the equator from a northern (or southern) latitude, it lands west of its "intended" longitude. Why?
Monday, November 11, 2013 at 3:56am

Science
Which experimental approach would be most effective and easiest to clearly determine the evolutionary relationship between these two organisms? a. sequence the same gene in both species to compare their similarity. b. dissect specimens of both species to look for homologous ...
Sunday, November 10, 2013 at 10:01pm

law ans ethics in allied health
the science of improving hededitary is known as a.genetics b.amniocentesis c.dna research d.eugenics my answer is a
Sunday, November 10, 2013 at 7:38pm

science help!!
You suffer from severe allergic reactions to things like stings from bees and wasps. What would be an important preparation for you if you were going to a farm to pick fruit?
Sunday, November 10, 2013 at 6:58pm

science help!!!
Explain how your respiratory system could help guard your body against pathogens that are in the air.
Sunday, November 10, 2013 at 6:41pm

Science
Which experimental approach would be most effective and easiest to clearly determine the evolutionary relationship between these two organisms? a. sequence the same gene in both species to compare their similarity. b. dissect specimens of both species to look for homologous ...
Sunday, November 10, 2013 at 5:26pm

Science
Study the wings of the birds in the two images below. Which of the following words applies to only one of the wing structures represented in this pair of species? A. homologous B. developmental C. vestigial D. inherited I cannot post the pictures, but they are basically one ...
Sunday, November 10, 2013 at 4:25pm

science
must all tpopgraphic maps have a contour line that represents 0m of elevation explain
Sunday, November 10, 2013 at 3:37pm

science
earth and the moon are kept in their respective orbits due to the influence of ? a) inertia b) gravity c) both inertia and gravity d) neither inertia and gravity
Sunday, November 10, 2013 at 2:34pm

science
which of earths spheres contains most of is mass ? a) atmosphere b) hydrosphere c) geosphere d) biosphere
Sunday, November 10, 2013 at 2:30pm

Science
A portion of the amino acid sequence of an enzyme from a worm is shown below. -Q-Q-Q-N-N-N-C-C Analyze the same portion of the same enzyme taken from several other organisms. Place them in order from most closely related to the worm most distantly related to the worm. -Q-R-Q-N...
Sunday, November 10, 2013 at 2:07pm

Science
an insect undergoes major changes in its life cycle - from egg, to larva, to pupa, to adult. This insect goes through what?
Sunday, November 10, 2013 at 7:24am

science
A bullet is fired horizontally with a velocity of 250 m/s from the top of a building 100m high. Find the Horizontal and vertical velocities of the bullet when it reaches the ground, the resultant velocity, the horizontal displacement, the net displacement, the direction of the...
Sunday, November 10, 2013 at 12:52am

Science
Which of the following explains why a bone in a bird’s wing is homologous to a bone in a lizard’s front leg? a.The bones in the two species provide for the same type of motion. b.The bones in the two species are both vestigial structures. c.The two species were ...
Sunday, November 10, 2013 at 12:02am

Science
what patterns you observe in regards to dissolved oxygen content and fish populations in the body of water?
Saturday, November 9, 2013 at 4:37pm

SCIENCE help please???????????
Choose the words or phrases that most accurately complete the sentences below. One of the most effective measures that a government can undertake to reduce cardiovascular disease is to ………………..In​dividuals can also decrease their own risk of...
Saturday, November 9, 2013 at 9:18am

additional science: physics
Hello i have 2 questions in total. 1) The meteor enters the Earth’s atmosphere with an acceleration of approximately 9.7 m/s2 and with a force acting on it of 1.94 N. What is the mass of the meteor? Show your calculations. 2) Compare this value of the acceleration due to ...
Saturday, November 9, 2013 at 8:24am

SCIENCE help?
I did this question in this way but 2 of them correct ,is anyone can help me with this question ,many thanks. Choose the words or phrases that most accurately complete the sentences below. Drag and drop your choices into their appropriate spaces. One of the most effective ...
Saturday, November 9, 2013 at 2:48am

Science
What is the structure that directs chromosome movement during mitosis and aids in the formation of the microtubule scaffolding that pulls on the chromosomes? a. Centrosome (maybe) b. Nucleosome (don't think so) c. Spindle (maybe) d. Cytokinesis(don't think so)
Friday, November 8, 2013 at 6:29pm

SCIENCE
I did this question in this way but 2 of them correct ,is anyone can help me with this question ,many thanks. Choose the words or phrases that most accurately complete the sentences below. Drag and drop your choices into their appropriate spaces. One of the most effective ...
Friday, November 8, 2013 at 11:54am

science
the force of gravity between two objects decreases as the distance between the two objects increases. true or false
Friday, November 8, 2013 at 11:40am

Earth Science
need help plzz .... I did some but I would like someone to double check them too 1. How did planetesmals form planets? (1 point) A. They broke apart into smaller chunks. B. They collided and stuck together. C. They cooled and pulled ice together. D. They began to rotate. 2. ...
Friday, November 8, 2013 at 11:23am

science
How did Rutherford, bohr, and quantum geiger-marden metail-foil experiments contradict thomas's raisin pudding model of the atom?
Friday, November 8, 2013 at 9:47am

Science!!!!
1. Which of the following gases was most likely present in Earth's earliest atmosphere? (1 point) A) nitrogen B) hydrogen* C) argon D) oxygen 2. Which of the following statements accurately describes the development of the geologic time scale? (1 point) A) Scientists ...
Friday, November 8, 2013 at 8:59am

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