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April 17, 2014

Homework Help: Science

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Recent Science Questions

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Science - 6th grade
A biologist studying a desert ecosystem observes that the population of a lizard species increases following a particularly hot, dry period that causes a snake population to decline. What could the biologist hypothesize about the roles of these two species? A.The lizard preys ...
Saturday, January 25, 2014 at 7:54pm

Science
Melaine is tired all the time. No matter how much rest she gets and food she takes in she doesn't have energy. What is the organelle that is malfunctioning in her cells? Justify your answer.
Saturday, January 25, 2014 at 7:39pm

Science~!!!
OOOOH.....ok, thank you I understand now :)
Saturday, January 25, 2014 at 7:25pm

science
I tried two but its not the correct answer. Could you help me find the right one?
Saturday, January 25, 2014 at 7:24pm

science
right, right, and look it up, I think it is two.
Saturday, January 25, 2014 at 7:19pm

Science~!!!
4 is C. Height 9 is B. Consider a very hot teacup of tea at 98C, and the pacific ocean at 60C. The pacific ocean has more thermal energy because of the total mass. 8, again, same issue. Grandmas pie is hotter,more avg KE.
Saturday, January 25, 2014 at 7:18pm

science
1. Which gas is a source of natural groundwater pollution? A. Carbon B. Oxygen C. Hydrogen D. Radon d? 2. A stream channel is formed when water A. carves a very deep and wide channel into rock. B. carries minerals into the ocean. C. creates a depression, which forms a lake. D...
Saturday, January 25, 2014 at 7:09pm

Science~!!!
1 When the air under the envelope is heated, the balloon lifts. Which of the following statements is true. a. Hot air balloons use radiation to rise b. Hot air balloons use conduction to rise c. hot air balloons use convection to rise d. hot air balloons use air resistance to ...
Saturday, January 25, 2014 at 7:06pm

science
B.
Saturday, January 25, 2014 at 6:55pm

science
a=(V-Vo)/t = (12.4-0)/3.77 = 3.29 m/s^2 d = 0.5*3.29*3.77^2 = 23.37 m. Work = F*d = (m*g) * d=(1920*9.8)23.37 = 439,805 Joules.
Saturday, January 25, 2014 at 6:47pm

science
If I had failed to achieve a Balance in My Titration Experiment and in Actuality Over Titrated, Meaning Adding NaOH Beyond the Endpoint, then Logically the Percent Composition of Acetic Acid Would Be Greater in My Results Since Theoretically, My Results would Have Indicated ...
Saturday, January 25, 2014 at 5:25pm

Science
Thank you that's what I wrote :)
Saturday, January 25, 2014 at 4:36pm

Science
Probably not.
Saturday, January 25, 2014 at 4:33pm

Science
Is reintroducing a native predator species harmful to the local ecosystem? Why?
Saturday, January 25, 2014 at 4:22pm

science
hi I wanna know the safety precautions of using of lead
Saturday, January 25, 2014 at 3:36pm

Science
1, 2. right 3. If gravity no longer affected it, why would it move toward earth?
Saturday, January 25, 2014 at 12:36pm

EARTH SCIENCE
looks good to me.
Saturday, January 25, 2014 at 11:45am

Maths literacy,life science,history,geography
I assume there is a college counselor in your school. You can get much more help there than in a few brief paragraphs here. Heck, you might even try a little research on line yourself, eh? No matter which career path you choose, you will need to learn how to find out ...
Saturday, January 25, 2014 at 11:37am

EARTH SCIENCE
Cumulus and stratus clouds belong to which cloud group? A. Puffy clouds B. High clouds C. Middle clouds D. Low clouds Is it A? What is the basic cause of ocean tides? A. Gravitational force of volcanic activity B. Gravitational attraction between the Moon and the entire solar...
Saturday, January 25, 2014 at 11:12am

Maths literacy,life science,history,geography
Plzz help me :(
Saturday, January 25, 2014 at 10:16am

Maths literacy,life science,history,geography
I PASSED MATRIC ND I WAS DOING THESE SUBJECTS..I PASSED WITH DIPLOMA.....THIS WAS HOW I WORKED.....#MATHS LITERACY (LEVEL 3) #GEOGRAPHY(LEVEL 3) #HOME LANGUAGE(LEVEL 7) #ENGLISH(LEVEL6) #LO(LEVEL7) #LIFE SCIENCE(LEVEL3)#....I WANT TO KNW WHAT CAN I STUDY AT TUT OR AT COLLEGE.....
Saturday, January 25, 2014 at 9:53am

materials science engineering
Identify the [221] vector.(crystallographic directions qns) The answer given corresponds to 0.5 in x direction,0.5 in y and 1 in z. Why is it not [1 1 0.5], the simply reduced form. The ans is the reciprocal of [221], which puzzles me since this is not a plane.
Saturday, January 25, 2014 at 1:50am

10th grade Science
http://orthopedics.about.com/cs/sportsme​dicine/a/iceorheat.htm http://health.howstuffworks.com/medicine​/first-aid/ice-or-heat-for-injury.htm
Friday, January 24, 2014 at 7:36pm

10th grade Science
Explain, physiologically, how you would decide to use ice or heat on an injury? My book doesn't have any good info on this question. Is there a reputable website or article to get info to answer this question?
Friday, January 24, 2014 at 7:27pm

Life science, history, geography, and maths literacy
Not really what i can say is if u change mathslit into pure that wont be very possible
Friday, January 24, 2014 at 5:39pm

please help me!! with this science!!!!!
Are the answers correct?
Friday, January 24, 2014 at 2:53pm

Science
Can someone please check my answers and if they are wrong can you help me fix them? Thank so much!! 1. Which of the following determines the strength of the force of gravity between two objects? Check all that apply. (2 points) the speeds of the objects the masses of the ...
Friday, January 24, 2014 at 1:08pm

Maths and science
13C8+13C7 = 3003
Friday, January 24, 2014 at 12:04pm

science
Which statement best compares an atom to an ion? A.An ion is an atom that has lost its charge. B.An ion is an atom that has gained or lost protons. C.An ion is an atom that has gained or lost electrons. D.An ion is an atom that has a different number of neutrons.
Friday, January 24, 2014 at 11:43am

science
How do two isotopes of the same element compare with each other? A.They have the same number of protons but a different number of electrons. B.They have the same mass number but a different number of protons. C.They have the same mass number but a different number of neutrons...
Friday, January 24, 2014 at 11:43am

science
How can atoms of two elements that have a different number of protons have the same charge? A.by also having a different number of neutrons B.by also having a different number of electrons C.by having the same mass number D.by being the same size atoms
Friday, January 24, 2014 at 11:42am

science
work= force*distance=mass*acceleration*distanc​e = mass (12.4/3.77)(12.4)
Friday, January 24, 2014 at 11:18am

science
D
Friday, January 24, 2014 at 11:15am

science
great.
Friday, January 24, 2014 at 11:14am

science
How are all atoms of iron different from the atoms of all other elements? A.number of neutrons B.charge on the atoms C.mass number D.number of protons I guessed. I knew the answer. 123456789101112131415161718192021
Friday, January 24, 2014 at 10:47am

science
How are the atoms of two different elements always similar to each other? A.They react in the same way. B.They have the same number of neutrons. C.Electrons and protons orbit the neutrons. D.Electrons orbit the nucleus.
Friday, January 24, 2014 at 10:43am

Maths and science
In how many ways can a lift holding eight passenger carry a part of thirteen in two journey?
Friday, January 24, 2014 at 10:37am

Physical Science 9
You can find your answer at the following site. http://en.wikipedia.org/wiki/Cementite
Friday, January 24, 2014 at 8:48am

Physical Science 9
What is the chemical equation for the rusting of iron carbide. I tried it myself,but I ended up with iron hydroxide rather than iron oxide. Help, Please, and thank you.
Friday, January 24, 2014 at 8:35am

science
A 1.92 × 103 kg car accelerates uniformly from rest to 12.4 m/s in 3.77 s. What is the work done on the car in this time interval?
Friday, January 24, 2014 at 7:49am

science
A 1.92 × 103 kg car accelerates uniformly from rest to 12.4 m/s in 3.77 s. What is the work done on the car in this time interval?
Friday, January 24, 2014 at 7:49am

Science
I read the article already, but I don't understand what is the answer. I am not sure if the question is referring to the the complementary base or something?
Friday, January 24, 2014 at 5:39am

Science
You can find your answer at the following site. http://en.wikipedia.org/wiki/Uracil_in_D​NA
Friday, January 24, 2014 at 5:28am

Science
RNA is to U(Uracil) as DNA is to ? a. Cytosine (don't think so) b. Guanine (don't think so) c. Thymine d. Adenine
Friday, January 24, 2014 at 4:07am

Science
The answer to that question is D. Hope this helps Anonymous.(:
Friday, January 24, 2014 at 2:37am

Science
Which of the following functions like a fulcrum in a lever? A. tendons connecting muscle to bone at a joint. B. ligaments connecting bones at a joint. C. two muscles working as a pair to move a joint. D. two bones meeting at a joint. B or D?
Friday, January 24, 2014 at 12:41am

Science??!!! :/
Oh. Thanks
Thursday, January 23, 2014 at 11:14pm

Science??!!! :/
Oh. Thanks
Thursday, January 23, 2014 at 11:14pm

Science??!!! :/
Didn't you study the websites I posted this morning for you? http://www.jiskha.com/display.cgi?id=139​0488561
Thursday, January 23, 2014 at 10:45pm

science gr.8 science fair topic ideas
http://chemistry.about.com/od/sciencefai​rprojectideas/a/8thgradeproject.htm http://www.sciencebuddies.org/science-fa​ir-projects/science_project_ideas.php
Thursday, January 23, 2014 at 10:42pm

Science
Which of the following functions like a fulcrum in a lever? A. tendons connecting muscle to bone at a joint. B. ligaments connecting bones at a joint. C. two muscles working as a pair to move a joint. D. two bones meeting at a joint.
Thursday, January 23, 2014 at 10:40pm

Science??!!! :/
I don't get any of this, plz plz, explain these to me!! 1.why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA). What was this particular time period called, and why is this time ...
Thursday, January 23, 2014 at 10:38pm

science gr.8 science fair topic ideas
what are some ideas for science fair projects gr.8?!?! and please give an experiment with it thank u!!
Thursday, January 23, 2014 at 10:30pm

science
Since this is not my area of expertise, I searched Google under the key words "100 percent solid bricks" to get these possible sources: https://www.google.com/search?client=saf​ari&rls=en&q=%22100+percent+solid+bricks​%22&ie=UTF-8&oe=UTF-8 In the future, ...
Thursday, January 23, 2014 at 9:10pm

science
Explain why 100 percent solid bricks are special. Give examples.
Thursday, January 23, 2014 at 9:04pm

Science
If it is waste removal from the body, I agree.
Thursday, January 23, 2014 at 8:38pm

science
Possibilities: 1. Power from grid ashore by subsea or overhead wires. 2, Central generator plant on the island using: a) fossil fuel (oil, gasoline, propane) or nuclear or fuel cell (H2 and O2) b) tidal power (you did not say where, need big rise/fall or current) c) solar d) ...
Thursday, January 23, 2014 at 7:50pm

science
Imagine you are an energyexpert on a planning council for a new town to be built on an island. Evaluate resources or methods you will suggest that the new town use. Justify your choices and provide possible challenges to the project.
Thursday, January 23, 2014 at 7:37pm

Science
Bobpursley can you please check this?
Thursday, January 23, 2014 at 7:33pm

Science
D?
Thursday, January 23, 2014 at 7:11pm

Science
Which of the following functions like a fulcrum in a lever? A. tendons connecting muscle to bone at a joint. B. ligaments connecting bones at a joint. C. two muscles working as a pair to move a joint. D. two bones meeting at a joint.
Thursday, January 23, 2014 at 7:06pm

Science
you are correct on all of them. good job
Thursday, January 23, 2014 at 6:25pm

science... PLEASE HELP!
Solids have a fixed shape and volume. Their molecules are locked in place. The molecules constantly vibrate, but they cannot move or switch places with other molecules. As a result, a solid retains its shape and size.
Thursday, January 23, 2014 at 5:56pm

science... PLEASE HELP!
Please explain how the movement and position of the particles change when a liquid bevomes a solid.
Thursday, January 23, 2014 at 5:46pm

science
I = momentum = m V = 8 V = 16 so V = 2 m/s
Thursday, January 23, 2014 at 5:35pm

science
Remember that the dependent variable depends on the independent variable. Speed at which the balls fall depends on the height from which the balls are dropped.
Thursday, January 23, 2014 at 5:32pm

science
An 8kg bowling ball is rolling in a straight line toward you. If its momentum is 16kg m/sec, how fast is it traveling?
Thursday, January 23, 2014 at 5:31pm

science... PLEASE HELP!
Say you want to show the relationship between pressure and volume of a gas If you change the pressure with a constant number of molecules of gas and a constant temperature you will hopefully get something like P1 V1 = P1 V2 HOWEVER if you let the temperature vary or some gas ...
Thursday, January 23, 2014 at 5:30pm

Science
The Indian Subcontinent was once a part of Eurasia and then as time passed, India moved northward into it's present day location.
Thursday, January 23, 2014 at 5:09pm

science
A heterogeneous mixture is when two or more substances are mixed but remain physically separate.
Thursday, January 23, 2014 at 5:07pm

science... PLEASE HELP!
Why does an investigator in an experiment change only one variable?
Thursday, January 23, 2014 at 5:03pm

science... PLEASE HELP!
Sure F = m a on a flat horizontal greasy table pull an object with a spring and measure the force and acceleration then mass * a = measured force or mass = measured force/measured a now hang the mass from the same spring and measure the force we know the mass from our earlier ...
Thursday, January 23, 2014 at 4:38pm

science... PLEASE HELP!
Could that really be an experiment?
Thursday, January 23, 2014 at 4:25pm

science... PLEASE HELP!
something that does not change. For example it might be the ratio of weight to mass on earth.
Thursday, January 23, 2014 at 4:23pm

science... PLEASE HELP!
Please describe a constant in an experiment.
Thursday, January 23, 2014 at 4:17pm

Science
http://www.google.com/webhp?source=searc​h_app#q=science+projects
Thursday, January 23, 2014 at 4:05pm

Science
Can anyone help me come up with a science project idea ?
Thursday, January 23, 2014 at 4:02pm

science help plzzz
you attend connections academy do your ow work or get stupid
Thursday, January 23, 2014 at 2:05pm

EARTH SCIENCE
hey I'm from there
Thursday, January 23, 2014 at 1:22pm

EARTH SCIENCE
Is this 8th grade connexus?
Thursday, January 23, 2014 at 1:12pm

EARTH SCIENCE
Well, that's ridiculous... I'm sorry! But those answers would make sense..
Thursday, January 23, 2014 at 12:44pm

EARTH SCIENCE
I tried with the Answers you gave me the first time I submitted the test but it told me it is incorrect. I thought those were correct as well..
Thursday, January 23, 2014 at 12:42pm

science
if 4 cars were going 100m the entire time what happens to speed,velocity and accelerationas one car completes one full lap
Thursday, January 23, 2014 at 12:40pm

EARTH SCIENCE
#1 is A #3 is D idk about #2
Thursday, January 23, 2014 at 12:35pm

EARTH SCIENCE
1. Which gas is a source of natural groundwater pollution? A. Carbon B. Oxygen C. Hydrogen D. Radon D? 2. A stream channel is formed when water A. carves a very deep and wide channel into rock. B. carries minerals into the ocean. C. creates a depression, which forms a lake. D...
Thursday, January 23, 2014 at 12:31pm

physical science
when they are both in the same direction.
Thursday, January 23, 2014 at 12:03pm

Science :(
These sites explain it. http://www.ucmp.berkeley.edu/mesozoic/tr​iassic/triassic.html http://www.enchantedlearning.com/subject​s/dinosaurs/mesozoic/triassic/ http://en.wikipedia.org/wiki/Triassic
Thursday, January 23, 2014 at 11:54am

chemical science
2 and 2
Thursday, January 23, 2014 at 10:04am

Science :(
Describe how the Triassic period was a transitional time period during the Mesozoic era. Explain why the boundary between the Triassic and Jurassic periods is similar to the boundary between the Permian and Triassic periods.
Thursday, January 23, 2014 at 9:49am

physical science
when will the resultant of the two(5N ,7N)vectors be at maximum?
Thursday, January 23, 2014 at 4:09am

chemical science
what is the van't Hoff factor for MgSo4.7H2O and ZnSo4.7H2O?
Thursday, January 23, 2014 at 3:11am

science
If the object is moved to a point 3 cm away from the lens. what is the new position, height, nature of the image?
Wednesday, January 22, 2014 at 11:33pm

science
An object 3 cm is high is placed 24 cm away from a convex lens of focal length 8 cm. Find nature position and height of the image?
Wednesday, January 22, 2014 at 11:20pm

science
what is heterogeneous mixture
Wednesday, January 22, 2014 at 10:21pm

science
1. B and D are right, in general. 2. yes, KE
Wednesday, January 22, 2014 at 9:20pm

science
1.what similarities do nuclear energy and chemical energy share?pick all that apply A.both are types of kinetic energy. B.both are types of potential energy C.both involve magnetic energy D.both involve stored energy (I PICK B AND D) 3.the energy an object has due to its ...
Wednesday, January 22, 2014 at 8:46pm

science(answer please)
my answers for 1 is B AND D. BUT NUMBER 2 I DONT KNOW
Wednesday, January 22, 2014 at 8:38pm

Science
Which of the following is the minimum level of structure needed to preform the function of waste removal? A. Body System B. Tissue C. Cell D. Organ I chose A for my answer, is it correct? Thanks. :)
Wednesday, January 22, 2014 at 8:28pm

science(answer please)
please answer these 1.what similarities do nuclear energy and chemical energy share?pick all that apply A.both are types of kinetic energy. B.both are types of potential energy C.both involve magnetic energy D.both involve stored energy 3.the energy an object has due to its ...
Wednesday, January 22, 2014 at 8:27pm

science
A class is learning about acceleration due to gravity. Their plan is to climb a ladder and drop different kinds of balls from the same height at the same time. They will repeat this for ten trials, recording the data after each test. A video will be made of the activity to ...
Wednesday, January 22, 2014 at 8:22pm

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