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July 30, 2014

Homework Help: Science

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Recent Science Questions

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science
The electric field 1.5 cm from a very small charged object points toward the object with a magnitude of 180,000 N/C. What is the charge on the object?
Sunday, January 26, 2014 at 11:18pm

science
The figure shows two unequal point charges, q and Q, of opposite sign. Charge Q has greater magnitude than charge q. In which of the regions X, Y, Z will there be a point at which the net electric field due to these two charges is zero?
Sunday, January 26, 2014 at 11:17pm

Science~!!!
Why does a thrown football have both potential and kinetic energy? What is the combined energy called? How do the principles of convection, conduction, and radiation explain how the water in a saucepan gets hot?
Sunday, January 26, 2014 at 8:50pm

Science
Unscramble these letters to make a sentence about stress. Eeoiieooaelnfrntssrsszrtgngcs
Sunday, January 26, 2014 at 7:56pm

Science
Two forces of 5 N and 7 N respectively act on an object when will the resultant of the two vectors be at a maximum?
Sunday, January 26, 2014 at 1:27pm

science
A car of mass 1500 kg accelerates up a hill of incline 8 degrees, increasing its speed from 4 ms to 16 ms over a distance of 90m. Assuming a total frictional resistance of 1000 N, calculte: a) the tractive effort between the wheels and the road surface b)the work done during ...
Sunday, January 26, 2014 at 11:28am

Science
True or false? Volcanic eruptions cause damage only when they are close to the crater's rim.
Sunday, January 26, 2014 at 10:53am

Science
A cannon ball is fired horizontally with a velocity of 50m/s from the top of a cliff 90m high,after how many seconds will it strike the plane at the foot of the cliff.at what distance from the foot of the cliff will it strike and with what velocity will it strike the ground.
Sunday, January 26, 2014 at 10:01am

Science
True or false? Volcanic eruptions cause damage only when they are close to the crater's rim.
Sunday, January 26, 2014 at 9:04am

Science
A solution is prepared by dissolving 38 g of H2S04 in 220 g water. If the density of the solution is 1.96 g/ml, find its: molality molarity mole fraction of the components of the solution normality This assignment is needed tomorrow. I really don't know the answer. I tried...
Sunday, January 26, 2014 at 8:17am

Science - 6th grade: CHECK MY ASNWER
Consider a wetland ecosystem similar to the one shown in the image below. In this ecosystem are two species: a small fish species and a wading bird species that feeds on the small fish as its main source of food. Oxygen levels are a limiting factor.Suppose that the local ...
Saturday, January 25, 2014 at 9:14pm

Science - 6th grade: CHECK MY ASNWER
If changing conditions lead to decreased oxygen levels in the stream, the carrying capacity of the stream for the trout will decrease. Oxygen level in water is therefore a(n) _____________ with respect to the number of trout that a particular stream can support. Is it "...
Saturday, January 25, 2014 at 8:32pm

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
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
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

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
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
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

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

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

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

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

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

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. 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

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.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
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

8th CCA Science
1. 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...
Wednesday, January 22, 2014 at 7:01pm

science help plzzz
Multiple Choice 1. Which of Earth's spheres contains mountains, valleys, and other landscapes? (1 point) atmosphere biosphere geosphere hydrosphere 2. Which of the following are examples of destructive forces? (1 point) ice wind both ice and wind neither ice nor wind 3. ...
Wednesday, January 22, 2014 at 6:44pm

Science help please
In class we have to think of a testable question for our science fair project our teacher is making us write 5 things I like then write make it into a testable question . EX: she said she likes sledding What is the effect of sled shape on sled speed ? I need help coming up ...
Wednesday, January 22, 2014 at 6:11pm

science
A rider with his bike, weighing a total of 300 kg jumps off a sloped ramp with a speed of 5.5 m/s. How high will the biker jump with this speed?
Wednesday, January 22, 2014 at 3:43pm

computer Science
20 You are trying to boot your computer but your computer keeps displaying a message after the POST that says “'invalid specification”. What does the error mean?” a. an attempt to overclock the primary drive has failed...
Wednesday, January 22, 2014 at 12:33pm

Physical Science
1) Carbon dioxide is obtain from the air and changed into carbohydrates oxygen during the process of fossilization. respiration. digestion. photosynthesis. 2) Which sequence of processes must occur for an atom of carbon to go from car to tree? respiration, decomposition. ...
Wednesday, January 22, 2014 at 10:50am

science
What is the acceleration of a 7kg rocjet if a force of 68.6 kg m/s/s (N) is used to move it away from the earth
Tuesday, January 21, 2014 at 7:53pm

science
Three people push a piano on wheels with forces of 130 N to the right, 150 N to the left, and 165 N to the right. What is the strength and direction of the net force on the piano?
Tuesday, January 21, 2014 at 6:35pm

science
How might the formation of Pangaea have led to mass extinctions at the end of the Permian period, about 250 million years ago?
Tuesday, January 21, 2014 at 6:31pm

science
A dog (canis familiaris) and a coyote (canis latrans) will readiliy mate in captivity and their offspring are healthy and fully fertile. Are we justified in saying they are distinct species? What might this tell us about the history of dogs and coyotes?
Tuesday, January 21, 2014 at 6:29pm

science
What is the density of Radon (Rn) gas at STP (standard temperature and pressure)? How do I solve/set up this problem? Thank you!
Tuesday, January 21, 2014 at 5:32pm

science
Why did Charles Darwin talk about pigeons (how breeders produced many shapes, sizes, and colors of pigeons, all starting from a wild pigeon) in his book On the Origin of Species?
Tuesday, January 21, 2014 at 4:49pm

Science
common pathways for food and air are the (1), which connects to the mouth, and (2), which connects to the larynx. Epithelium in this region is (3), which provideds good protection from friction. Three bands of skeletal muscle, the (4) propel food into the (5). Entrance to the ...
Tuesday, January 21, 2014 at 4:36pm

Life science
Name any 3 mineral elements that are required for the formation of membremes.
Tuesday, January 21, 2014 at 4:21pm

Science help please
Provide three statements that demonstrate the importance of units when describing motion? I am really confused about this question. I don't know what they are trying to ask.
Tuesday, January 21, 2014 at 1:51pm

Science
Can someone please please help me? I don't have a text book, i have a online book and it isn't working. Can someone please be nice and help me? Science isn't my subject! 1. Why is Earth’s temperature just right for life? (1 point) Earth’s core is hot ...
Tuesday, January 21, 2014 at 12:12pm

science
1. Which organisms are capable of converting gaseous nitrogen in the air into a form that other living organisms can use? (1 point) nitrogen-fixing bacteria denitrifying bacteria decomposers producers 2. Which step in the nitrogen cycle is accelerated at the beginning of the ...
Tuesday, January 21, 2014 at 10:14am

science
1. Which of the following explains why your body may contain a carbon atom that was present in George Washington’s body in 1776? (1 point) Carbon moves in a one-way direction through living organisms only. Carbon moves in a one-way direction from the atmosphere and then ...
Tuesday, January 21, 2014 at 9:16am

science
3. How would the carbon cycle be affected if all producers were removed? (1 point) Carbon compounds in animals would not be broken down to release carbon dioxide back into the atmosphere. Carbon would not have a way to enter the bodies of living things. Carbon dioxide levels ...
Tuesday, January 21, 2014 at 9:13am

can you help me with one science question Ms. Sue
3. How would the carbon cycle be affected if all producers were removed? (1 point) Carbon compounds in animals would not be broken down to release carbon dioxide back into the atmosphere. Carbon would not have a way to enter the bodies of living things. Carbon dioxide levels ...
Monday, January 20, 2014 at 10:02pm

someones GOTTA help me with this science...!!!
1. Which of the following describes the correct sequence of events during the water cycle? (1 point)precipitation ¨ condensation ¨ evaporation ¨ runoff condensation ¨ precipitation ¨ runoff ¨ evaporation runoff ...
Monday, January 20, 2014 at 9:25pm

Science
Mutations can occur in sex cells or in body cells. In which cell type might a mutation be passed from generation to generation? Explain.
Monday, January 20, 2014 at 8:17pm

Science
Mutations can occur in sex cells or in body cells. In which cell type might a mutation be passed from generation to generation? Explain.
Monday, January 20, 2014 at 7:16pm

science
Why is it important to preserve biodiversity? A. Preservation of biodiversity prevents extinction of species, b. Preservation of biodiversity prevents the human population from increasing exponentially, c. Preservation of biodiversity disturbs the balance of ecosystems, d. ...
Monday, January 20, 2014 at 5:43pm

Science
A sample of nitrogen gas is confined in a 8.494 L container at 2.643 x 102 torr and 50 oC. How many moles of gas are present in the sample? So I thought I set this problem up right and when I type the answer into CALM my answer is incorrect. This is what I did: PV=nRT (2.643 x...
Monday, January 20, 2014 at 5:14pm

science
whats the uses of the element mercury?
Monday, January 20, 2014 at 3:19pm

Science
Which of the following is the minimum level of structure needed to perform the function of waste removal? A. body system B. tissue C. cell D. organ C Which two systems work with the muscular system to allow the body to move? A. digestive and urinary B. skeletal and nervous C. ...
Monday, January 20, 2014 at 2:58pm

Science
A green leaf is reflecting a. no light b. red light c. green light d. all light C
Monday, January 20, 2014 at 2:54pm

Science
How percentage n2gas on air
Monday, January 20, 2014 at 1:59am

Science
1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1 point) A lunar eclipse can...
Sunday, January 19, 2014 at 6:30pm

Science
1. Which type of eclipse would you expect to see if the moon passes directly between Earth and the sun? (1 point) a solar eclipse* a lunar eclipse a total lunar eclipse a penumbra 2. Which of the following statements about a lunar eclipse is true? (1 point) A lunar eclipse can...
Sunday, January 19, 2014 at 4:58pm

science
transmission electron microscope compound (light) microscope scanning electron microscope field scope dissecting microscope Arrange the five types of microscopes in order from lowest resolution to highest.
Sunday, January 19, 2014 at 3:48pm

english
I need help paraphrasing this paragraph. Because addiction treatment aims to change deeply embedded habits, relapse can be part of the process. However, this is a well-known feature of diabetes, hypertension, asthma, and other chronic diseases with treatment plans that depend ...
Sunday, January 19, 2014 at 3:15pm

Science help asap 2 questions!!!
4. Which of the following describes an example of a potentially invasive species? (1 point) Fruit covered with fruit fly eggs is trucked from Mexico to Canada. Racehorses are shipped by boat from New York to London. Coffee beans in burlap bags are flown from Africa to the U.S...
Sunday, January 19, 2014 at 2:32pm

maths, physical science , life science , geography
Hi I am in grade 10 , I am doing maths physical science, life science and geography, what jobs can I get into with those subjects
Sunday, January 19, 2014 at 12:45pm

SCIENCE 1 QUESTION PLS HELP ASAP
Select three words that belong together. To do this pick one word from each of the three sets below: Set 1: Estuary, Lake, Neritic Zone Set 2: High Salt, Intermediate Salt, No Salt Set 3: Trout, coral, oyster Answer choices: A) Neritic zone, intermediate salt, oyster B) Lake, ...
Sunday, January 19, 2014 at 9:43am

Science
2 forces of 5N&7N respectively act on an object. (a) When will the resultant of 2 vectors be at a maximum? (b) When will the resultant of the 2 vectors be at a minimum?
Sunday, January 19, 2014 at 12:33am

SCIENCE 1 QUESTION PLS HELP ASAP
Select three words that belong together. To do this pick one word from each of the three sets below: Set 1: Estuary, Lake, Neritic Zone Set 2: High Salt, Intermediate Salt, No Salt Set 3: Trout, coral, oyster Answer choices: A) Neritic zone, intermediate salt, oyster B) Lake, ...
Saturday, January 18, 2014 at 10:09pm

SCIENCE PLS URGENT 1 QUESTION ASAP!!!!!
8. Chromosome pairs contain different versions of genes, which are called __________________. (1 point) is it base? is it dna? is it alleles? help asap!!!??
Saturday, January 18, 2014 at 4:18pm

science
Two pure bred strains of peas are crossed: wrinkled, yellow x round, green. All the offspring are round, yellow. These offspring were self-crossed and their progeny produced four different phenotypes. For this question assume the random assortment of two unlinked genes. See ...
Saturday, January 18, 2014 at 3:41pm

science
The Australian grass tree, from the genus Xanthorrhoea in the lily family, grows to a height of about 4.5 m, bears long narrow leaves in a tuft at the top of the trunk, and produces yellow or white flowers in a spike above the leaves. A yellow-flowered tree was self-crossed. ...
Saturday, January 18, 2014 at 3:40pm

science
The Australian grass tree, from the genus Xanthorrhoea in the lily family, grows to a height of about 4.5 m, bears long narrow leaves in a tuft at the top of the trunk, and produces yellow or white flowers in a spike above the leaves. A yellow-flowered tree was test-crossed. ...
Saturday, January 18, 2014 at 3:40pm

science
The Australian grass tree, from the genus Xanthorrhoea in the lily family, grows to a height of about 4.5 m, bears long narrow leaves in a tuft at the top of the trunk, and produces yellow or white flowers in a spike above the leaves. A yellow-flowered tree was self-crossed. ...
Saturday, January 18, 2014 at 3:38pm

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