Sunday
December 21, 2014

Homework Help: Science

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Recent Science Questions

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Science
If 1 J of energy is applied to lift an object of 500 kg how high will it rise?
Sunday, December 21, 2014 at 10:32am

Science
The work required to be done to stop a car of 1500 kg moving at a velocity of 60 km/h is?
Sunday, December 21, 2014 at 10:25am

Science
A ball is thrown up and attains a maximum height of 1000 m.It's initial speed was?
Sunday, December 21, 2014 at 10:19am

Science
WHY PUMICE STONE FLOAT IN WATER
Sunday, December 21, 2014 at 8:58am

physical science
For questions #14 – 16, write an equation for the reaction of magnesium oxide with sodium chloride to produce magnesium chloride and sodium oxide. 14. Show the formulas of the reactants. 15. Show the formulas of the products. 16. Write the balanced the equation for this ...
Saturday, December 20, 2014 at 8:43pm

Maths lite, business, geography, life science
What carreer can I choose after matric with these subjects?
Saturday, December 20, 2014 at 2:23am

Science
How have humans observed heredity over time and how has that perception changed as major paradigm shifts in the discipline took place?
Friday, December 19, 2014 at 2:14pm

Science
Explain the concept of public trust as the author uses it. Resnik, D. (2011). Scientific Research and the Public Trust. Science & Engineering Ethics, 17(3), 399-409
Friday, December 19, 2014 at 1:18pm

Writing/Environmental science
I'm writing a thesis/research paper on how all animals play an important role on the environment. I'm trying to narrow my paper down on an endangered species but I'm having trouble deciding/thinking of a species that play IMPORTANT roles (ie.- honeybees). Except I ...
Friday, December 19, 2014 at 1:03pm

science
Explain the concept of public trust as the author uses it.
Friday, December 19, 2014 at 12:42pm

Physical Science
Balancing Decay Reactions. Fill in the blank with the correct piece to balance the decay equation. 1. (184/74) W (4/2) He + _____ 2. (210/82) Pb______+ (206/80) Hg 3. (35/16) S  (0/-1) e + _______ 4. ________  (0/-1) e + (60/28) Ni My work: 5. (...
Friday, December 19, 2014 at 12:35pm

science
How have humans perceived heredity over time and how has that perception changed as major paradigm shifts in the discipline took place.
Friday, December 19, 2014 at 12:31pm

Science
In a sample of 0.65L of H2O contains 2.5×10^50 molecules.What is the density of sample of H2O?
Friday, December 19, 2014 at 8:18am

Science
How are respiration and fermentation similar? How are they different?
Thursday, December 18, 2014 at 7:54pm

Science
Can an egg or sperm be formed through mitosis?
Thursday, December 18, 2014 at 7:41pm

Science
Check my answers please? Imagine that you remove all the atoms from a chair. What remains? 1. nothing 2. a pile of dust I choose 1. Which of the following is not made of atoms? 1. heat 2. a solid 3. a gas I choose 1. What about matter is true? 1. atoms are not matter but they ...
Thursday, December 18, 2014 at 7:30pm

Science
What allows small particles to move through cell membranes? Is it diffusion?
Thursday, December 18, 2014 at 5:08pm

Science
Which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait? A- homozygous B- dominant C- heterozygous D- recessive My guess is A.
Thursday, December 18, 2014 at 4:40pm

science
Calculate the weight of gold having specific heat capacity 0.13 joule which is heated from 25 degree c to 300 degree c, where the heat absorbed is 1500 joule?
Thursday, December 18, 2014 at 10:31am

science
NaOH + HSO -+ Which of the following is the number of moles of NaOH required to neutralize 1 mole of H2SO4 in the equation above?
Thursday, December 18, 2014 at 10:30am

science
A circular disk is rotating in a horizontal plane with a time period 3.14 second.At what distance from the center a coin of mass 10 gram may be kept so that the coin coin may remains stationary the coefficient of friction is 0.52?
Thursday, December 18, 2014 at 9:07am

Science Please Check!
Which term describes a type of trait that is usually expressed only when an organism has two identical alleles for the trait? A- homozygous B- dominant C- heterozygous D- recessive My guess is D. Please help!
Thursday, December 18, 2014 at 12:27am

science
Which of the following best describes the process of diffusion?
Thursday, December 18, 2014 at 12:08am

HEALTH
Phonology refers to the science which treats
Wednesday, December 17, 2014 at 11:48pm

HEALTH
Phonology refers to the science which treats A. blood disorders. B. vocal sounds. C. heart rhythms. D. nutritional deficiencies.
Wednesday, December 17, 2014 at 11:35pm

Science
Assume that you have 15ml of 2.5M potassium hydroxide but only have concentrated bottle of 16M strength. How would you obtain this
Wednesday, December 17, 2014 at 8:45pm

Math
The mean of Susan's math and science scores is 74 points. The mean of her math and English scores is 83 points. How many more points did Susan score in English than in science?
Wednesday, December 17, 2014 at 7:29pm

science
In the course of a short race a car does 50,000 j of work in 7s what is the power of the car during the race
Wednesday, December 17, 2014 at 4:12pm

Science Please Help
an illness caused by fungus
Wednesday, December 17, 2014 at 10:04am

Science-Physics
A mover is pushing a crate across the floor. He exerts a force of 500 Newtons and pushes the crate a distance of 5 Meters. How much work did the mover do on the crate?
Wednesday, December 17, 2014 at 9:50am

Graph Theory/ Algorithms / Computer science
I am working on this problem from the book, Data Structures & Algorithm Analysis in C++. The problem is: 9.40 Give a polynomial-time algorithm that finds ceil(V /2) vertices that collectively cover at least three-fourths (3/4) of the edges in an arbitrary undirected ...
Wednesday, December 17, 2014 at 12:25am

science
uncertainties for... grams? digital balance cm? minutes? 5 minutes? milliliter (ml)?
Tuesday, December 16, 2014 at 8:02pm

Science
Why are liners laid down at the bottom of a landfill before waste is deposited in the landfill ?
Tuesday, December 16, 2014 at 2:21pm

Science
Express your opinion about dealing with antibiotic resistance you think are most important to pursue.
Tuesday, December 16, 2014 at 10:05am

science 8
Waht is the reason for the seasons experiment?
Tuesday, December 16, 2014 at 9:46am

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 animals***** c) the soft parts cannot be buried in sediment d) the soft parts form petrified fossils which of the following terms ...
Monday, December 15, 2014 at 10:01pm

Science
Why are there variations in atmospheric pressure how was this proven? Why do your ear pop when trebling to different altitudes?
Monday, December 15, 2014 at 9:39pm

science 1 question
which of the following is an example of an effect of natural selection? All of the children of two parents are male. Carbon cycles through ecosystem. Favorable environmental conditions cause an increased food supply. Polar bears have white fur. Is the answer C?
Monday, December 15, 2014 at 8:43pm

Science help
1.Some plastics are made from corn. These plastics are biodegradeable. This means that plastics made from corn will (blank) than regular plastic My answer decompose faster 2. In the ocean, there are areas where there are very few living things. (Blank) is the term that ...
Monday, December 15, 2014 at 8:11pm

Science help
A (blank) is a tool used to capture the energy in sunlight. My answer Photochemical Am I right?
Monday, December 15, 2014 at 8:05pm

Science
9. If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis? There is a picture but I cant upload it. Please help me!
Monday, December 15, 2014 at 6:47pm

Science help
In the ocean, there are areas where there are very few living things. (Blank) is the term that described when this happens to a natural gas. My answrer Aquaculture Am I right?
Monday, December 15, 2014 at 5:10pm

Science help
A homeowner determined that he used 114 gallons of oil every month to heat his home in the winter. This information would be considered part of his My answer Carbon footprint Am I right?
Monday, December 15, 2014 at 4:53pm

Science help
(Blank) are nonrenewable resources that are used around the world because they are relatively inexpensive. My answer Fossil fuels Am I right?
Monday, December 15, 2014 at 4:39pm

Science Help!!!!
To solve the problem of a polluted stream a scientist traced where the pollution was coming from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of (blank) pollution ...
Monday, December 15, 2014 at 4:01pm

Science
During exercise your body's blood pressure increases as it cool down the body's blood pressure slowly returns to its normal state this is know as?
Monday, December 15, 2014 at 12:20pm

Physics
Instructions: Read the following paragraph carefully. Then use what you know about momentum, work, and energy to answer the following questions. Be sure to show your work. You are a traffic accident investigator. You have arrived at the scene of an accident. Two cars of equal ...
Monday, December 15, 2014 at 11:31am

Science
Creativity is always discouraged in scientific endeavors. True or False. I thinks its true.
Monday, December 15, 2014 at 9:34am

Science
The speed of light is 3 x 10 to the 8th power meters per second. If the sun is 1.5 x 10 to the 11th power meters from earth, how many seconds does it take light to reach the earth?
Monday, December 15, 2014 at 7:06am

Science Help!!!!
1. Which of the following types of pollution cannotbe attributed to car and truck emissions? A. Acid rain B. Sedimentation C. Ozone D. Photochemical smog 2. In which of the following places is it more difficult to determine if there is pollution? A. Aquifer B. Stream C. Air D...
Monday, December 15, 2014 at 1:25am

Science Help!!!!
1. Running the dishwasher only when it is completely full is an example of A. Increases resource use B. Using nonrenewable resources C. Using renewable resources D. Reducing resource use 2. Cotton is a plant used to make clothing. Cotton would best fit into which of the ...
Monday, December 15, 2014 at 1:01am

Science Help!!!!
How does using coal to generate electricity affect the enviroment? A. Using more coal reduces the amount of pollution from using oil. B. Using coal improves the quality of nearby water. C. Using coal, instead od wood from trees, helps improve the inviroment. D. Using coal ...
Monday, December 15, 2014 at 12:36am

Physical science
What is the formula of magnesium sulfate and ammonia? My work:MgSO4 + 2NH4OH --> (NH4)2SO4 + Mg(OH)2 Correct/Balance the equation below. MgSO4 + NH4OH → (NH4)2SO4 + Mg(OH)2
Monday, December 15, 2014 at 12:00am

Science Help!!!!
Solar,wind,nuclear,and hydorelectric energy sources are similar in which of the following ways? A. They are all nonrenewable energy sources. B. They all require an indirect use of sunlight in order to make electricity. C. They are all considered alternative energy sources. D. ...
Sunday, December 14, 2014 at 11:22pm

Science Help!!!!
In which of the following places is it more difficult to determine if there is pollution? A. Aquifer B. Stream C. Ajr D. Pond Is the answer d?
Sunday, December 14, 2014 at 10:29pm

Science Help!!!!
Which of the following energy sources is relativelyexpensive to set up, but has a low cost once it is in place? A. Natural gas B. Coal C. Nuclear power D. Solar power Is the answer D?
Sunday, December 14, 2014 at 9:21pm

Science Help!!!!
Which of the following is used to make biomass fuel? A. Coal B. Natural gas C. Plants and animal waste D. Petroleum Is the answer C?
Sunday, December 14, 2014 at 9:08pm

Science Help!!!!
Which of the following is a source of photochemical smog. A. Fossil fuels B. Wind energy C. Biomass fuels D. Nuclear energy Is the answer A?
Sunday, December 14, 2014 at 8:40pm

Science
I am having a very had time completing this question What and how does the cell membrane regulate? What three factors influence this process?
Sunday, December 14, 2014 at 5:38pm

Science
15 ml of saturated solution of potassium chloride in water at 50 degress Celsius is raised to 70 degress Celsius. How much more kcl will dissolve?
Sunday, December 14, 2014 at 4:07pm

Science
Can someone actually help me with this...? Instead of telling me to use my books... (My school does NOT give us books.!) How is incomplete dominance different than dominance? Explain why incomplete dominance only occurs in this genotype?
Sunday, December 14, 2014 at 11:04am

Science 😭
How is incomplete dominance different than dominance? Explain why incomplete dominance only occurs in this genotype?
Sunday, December 14, 2014 at 10:41am

science
how many cell divisions would it take to produce at least 1000 cells from one Cell?
Sunday, December 14, 2014 at 9:30am

Science Help!!!!
1. Running the dishwasher only when it is completely full is an example of A. Increasing resource use. B. Using nonrenewable resources. C. Using renewable resources D. Reducing resource use*** 2. Cotton is a plant used to make clothing. Cotton would fit best into which of the ...
Sunday, December 14, 2014 at 12:19am

Science Help!!!!
1. Which of the following describes an example of land reclamation? A. After an area is mined for copper, the soil is replaced and new plants are planted. B. After a forest is clear-cut, desertfication occurs. C. After a forest is clear-cut, is mined for copper. D. After an ...
Saturday, December 13, 2014 at 11:46pm

science
An experiment is set up to test whether a particular insect prefer a dark or a bright environment. A chamber with a gradient in light intensity from one end (dark) to the other (bright) has been made. The experimental hypothesis is: “There will be a large difference ...
Saturday, December 13, 2014 at 12:39pm

Science
How to find Electron Configuration
Saturday, December 13, 2014 at 12:15pm

Grade 9 Science
why does a planet's orbital radius represents that planet's average distance from the sun and not its exact distance?
Friday, December 12, 2014 at 9:50pm

Science
An airplane with a speed of 27.4 m/s is climbing upward at an angle of 48° counterclockwise from the positive x axis. When the plane's altitude is 860 m the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath ...
Friday, December 12, 2014 at 8:06pm

art
which of the following was true of the age of reason? a. people justified their faith using scientific principles b. people valued science over faith c. people debated the raison detre
Friday, December 12, 2014 at 7:54pm

science
A polo player hits a ball with a mass of 0.42 kg with a force of 7.35 Newtons. How does the force the polo player's mallet exerted on the ball compare to the force the ball exerted on the mallet? A. The force of the mallet on the ball is equal in magnitude and opposite in ...
Friday, December 12, 2014 at 5:45pm

science
example of a change in state in state that releases energy
Friday, December 12, 2014 at 10:09am

science
2) Which is not an example of matter? A. water B. air(i think it this one) C. gold D. sound 3) The amount of space an object occupies is called its ..... A. volume(i think it this one) B. mass C. electricity D. gravity 4) Atoms in a molecule are joined together by.. A. ...
Friday, December 12, 2014 at 9:51am

Science
Pure gold can be fashioned into elaborate masks and thin plates that can be incorporated into clothing.what physical trait of metal doea this demosnstrate
Friday, December 12, 2014 at 9:23am

Science
When magnesium oxide (MgO) and water (H20)react, they produce magnesium hydroxide Mg(OH)2. Magnesium hydroxide is a medicine used to treat an upset stomach. The equation for this chemical change is shown below: MgO + H20 --> Mg(OH)2 if 40.00 grams of magnesium oxide and 18....
Thursday, December 11, 2014 at 10:54pm

Science
Name two functions of a nucleus. [I think one of them is that it contains the cell's DNA.]
Thursday, December 11, 2014 at 6:18pm

science
A couple has just learned that their daughter has hemophilia. They already have a son who does not have the disease. What are the genotypes of the couple? Explain your reasoning.
Thursday, December 11, 2014 at 4:23pm

Science Help
Drew is walking back up the best hill in the neighborhood 24* grade. He's pulling on the empty 2.1kg sled with a force of 18N at an angle of 55* with the hill. He's walking with a constant velocity, what is the coefficient of friction?
Thursday, December 11, 2014 at 10:32am

science
a 150 gram bullet is fired with a speed of 50 ms if it is stopped after hitting a target 101 meters away what is its initial KE
Thursday, December 11, 2014 at 5:05am

science: question
is autoclaving same as heating the tooth?
Thursday, December 11, 2014 at 1:40am

Science Project: Teeth (PLEASE HELP)
How hot should water be for teeth to stay in for 30 minutes? I don't have any equipments to heat the teeth and I have check the hospital and have asked my mom.She works in the hospital there and she says they have one in the lab and I can't use it anyway. I'm ...
Thursday, December 11, 2014 at 12:28am

math
A total of 121 people came to the school science fair this year. This is 7 more than twice the number of people who came to last years science fair. How many people came last year?
Wednesday, December 10, 2014 at 11:28pm

Science
I have to write an argument date why the adaptation of camouflage helps a predator more than it helps a prey animal and I have to have 3 valid points. What is a good website to research this?
Wednesday, December 10, 2014 at 10:26pm

Science tech
What do bridges and buildings have in common ?
Wednesday, December 10, 2014 at 9:58pm

Science
Bird. Trait Hummingbird Wings: Legs: Beak: Body: Penguin. .Wings: Legs: Beak: Body: why it might be beneficial for different types of birds to have different types of bodies
Wednesday, December 10, 2014 at 8:32pm

Science
Liquid A=0.68 g/ml Liquid B=0.76 g/ml Liquid C=1.00 g/ml Liquid D=1.08 g/ml A new liquid with a density of 0.97 g/ml is poured into a graduate cylinder. Where would it layer in relationship to the other liquids?
Wednesday, December 10, 2014 at 8:14pm

science
Lava flows from cracks in the earth and hardens into basalt, what type of rock result, is the answer sedimentary
Wednesday, December 10, 2014 at 7:49pm

science
Heat and pressure change rock inside the earth crust into gneiss. What type of rock result. Is the answer igneous
Wednesday, December 10, 2014 at 7:31pm

science
Pressure changes layers of mud into shale. What type of rock is the answer sedimentary
Wednesday, December 10, 2014 at 7:20pm

science
Some people that suffers from clinical depression experience feelings of tiredness and feel the need to sleep much more than usual. a. How and why is feeling of tiredness and lethargy connected to depression? b. Is it better to fight off the feeling of tiredness and sleepiness...
Wednesday, December 10, 2014 at 7:09pm

science
Sandstone is exposed to extreme heat and pressure changing into quartzite. What type of rock. Is it metamorphic rock
Wednesday, December 10, 2014 at 6:53pm

science
Layers of mud made mostly of tiny shells and calcite crystals form the soft rock chalk. What type of rock results. Is the answer igneous rock
Wednesday, December 10, 2014 at 6:50pm

science
By studing rock layer scientist can learn about changes in earth formation and climate. True or false. Is the anser true
Wednesday, December 10, 2014 at 6:38pm

science
The remain of long dead organism may form fossils, true or false. Is the answer true
Wednesday, December 10, 2014 at 6:34pm

Science
Swimmers find that they can float more easily in the ocean than in freshwater pond. Explain the reason for this phenomenon
Wednesday, December 10, 2014 at 6:06pm

Physical Science
Fill in the blanks using the correct term from the list below. Active Combustion free heating systems passive heat pump thermal energy stroke 1. A house with large windows on its south side and few windows on its other sides probably uses a(n) Blank solar heating system. 2....
Wednesday, December 10, 2014 at 5:33pm

Pysical Science
The transfer of thermal energy by convention and conduction both require what? Unscramble atterm
Wednesday, December 10, 2014 at 5:18pm

science
how much force is used when a 3.00 km object is moved by 51.0 kj of work?
Wednesday, December 10, 2014 at 3:51pm

Science~!
What would happen to a object if the force of gravity on earth was decreased by half? A. mass would decrease b. its weight would decrease c its density would decrease d. its volume will decrease A certain object has a volume of 25.0 mL and mass of 100g whats the density of the...
Wednesday, December 10, 2014 at 1:07pm

science
why did a portion of the tabletop get cold when Natasha placed her cold drink on the table. a.the table's molecules were vibrating more slowly in that area b.the table's have spread farther apart in that area c.the table's had gained energy in that area d.(this is ...
Wednesday, December 10, 2014 at 11:28am

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