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January 29, 2015

Homework Help: Science

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Recent Science Questions

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Earth Science to Ms.Sue
7.   What gives the gem amethyst its purplish color? A. Quartz B. Titanium C. Oxygen D. Iron The answer was not A, got this question wrong.
Wednesday, January 28, 2015 at 10:45pm

Earth Science
15.   Which statement best describes the composition of magma?      A. Magma is an element all its own.B. Magma contains the same elements as snow.C. Magma contains only three elements.D. Magma contains the same ...
Wednesday, January 28, 2015 at 10:03pm

Earth Science
 Which statement best describes the composition of magma?  A. Magma is an element all its own. B. Magma contains the same elements as snow. C. Magma contains only three elements. D. Magma contains the same elements as Earth's crust.&...
Wednesday, January 28, 2015 at 8:38pm

Earth Science
   What element has 81 protons in the nuclei of its atoms?  A. Thallium B. Uranium C. Platinum D. Lead A?
Wednesday, January 28, 2015 at 8:14pm

Science-Chemistry
Can you please help me solve r1/r2 = sqrt(M2/M1)for M1. My answer: M1=M2r2^2/r1^2 Is this correct?
Wednesday, January 28, 2015 at 8:03pm

Earth Science
Please check down below.
Wednesday, January 28, 2015 at 7:56pm

Earth Science
10.   Which statement best describes the formation of diamonds?  A. Diamonds form in kimberlites under very low pressure. B. Diamonds form in talc under very low pressure. C. Diamonds form in talc under very high pressure. D. ...
Wednesday, January 28, 2015 at 7:37pm

Earth Science
  A heterogeneous mixture is a  A. mixture in which its components retain their identity. B. component added to sand that makes it inseparable. C. mixture that always contains water. D. mixture in which its components can't be separated.&...
Wednesday, January 28, 2015 at 5:53pm

science
If a kestrel eats a mouse that eats grass, the kestrel is a
Wednesday, January 28, 2015 at 4:44pm

Science
1) Which of the following is a chemical change? (1 point) Boiling of water Melting a cube of ice Dissolving 10 grams of salt in water Splitting water into hydrogen and oxygen*** 2) What is the mass of water that results from combining 2.0g of hydrogen with 16.0g of oxygen? (1 ...
Wednesday, January 28, 2015 at 2:22pm

Science
I would really appreciate it if someone checked my answers and told me if they were right. Thx. ~Ashley 1. Which of the following determines the strength of the force of gravity between two objects? Check all that apply. A: The speeds of the objects. *B: The masses of the ...
Wednesday, January 28, 2015 at 2:21pm

Partly science, partly curiosity
Does iodized salt mold?
Wednesday, January 28, 2015 at 2:19pm

Science
How do lawmaker make good environmental decisions? A. By relying on the short-term benefits of an environmental issue. B. By weighing down the costs and benefits of an environmental issue C. By relying only on the economical impact of an environmental issue D. By relying only ...
Wednesday, January 28, 2015 at 1:59pm

Science
Which kind of pollution is illustrated by a pipe gushing polluted water into a river? A. Point source B. Nonpoint source C. Carbon source. D. Resource source
Wednesday, January 28, 2015 at 1:51pm

science
an animal that basks on a warm rack during the morning hours but retreats to the sade of the rocks during the middle day is most likely a(n) A)ectotherm B) endotherm C)vertebrate D) chordate
Wednesday, January 28, 2015 at 1:14pm

science
most bacteria are A) unicellular eukaryotes B) unicellular prokaryotes C) multicellular eukaryotes D) multicellular prokaryotes
Wednesday, January 28, 2015 at 11:44am

science and technology engineering mathematics
Do you have sites that can help me understand science and technology engineering mathematics?
Wednesday, January 28, 2015 at 9:02am

Physical Science
Which of the following statements are true about chemical reactions? Check all that apply. A. Reactants are on the right when writing a chemical reaction. B. Products are produced in a reaction. C. Reactants are present at the end of a reaction. D. Products are on the right ...
Tuesday, January 27, 2015 at 11:25pm

Earth Science
Describe how weathering and erosion can be both destructive or constructive. I am still confused on the difference of erosion and weathering...
Tuesday, January 27, 2015 at 9:52pm

science gases
The air that you breathe is a gas.List other gases that you have heard about in a science class.
Tuesday, January 27, 2015 at 9:33pm

science
When the temperature of the air in a hot air balloon increases, what happens to the volume of the gas?
Tuesday, January 27, 2015 at 9:23pm

SCIENCE HELP NEED ANSWERS FAST!!!!!!!
Here are all the word you can use chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter describes its ability to change into ...
Tuesday, January 27, 2015 at 8:51pm

science need answers fast!!
Here are all the word you can use chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter describes its ability to change into ...
Tuesday, January 27, 2015 at 8:21pm

science
for every cubic meter of 30 degrees celsius saturated coded to 16 degrees celsius fowmany grams lost
Tuesday, January 27, 2015 at 7:46pm

science
how do measure density
Tuesday, January 27, 2015 at 5:30pm

Science
How much net force is needed to make a 60 kg object accelerate at a rate of 2.0 m/s^2? A. 62N B. 62 kg C. 120 N D. 120 kg Is the answer C? Thank you
Tuesday, January 27, 2015 at 5:15pm

Physics
For a science fair competition, a group of High School students built a kicker-machine that can launch a golf ball from the origin with a velocity of 12.9 m/s and initial angle of 31.7° with respect to the horizontal. a) Where will the golf ball fall back to the ground? ...
Tuesday, January 27, 2015 at 5:09pm

science
a colorblind woman marries a man who isn't colorblind. All of their sons are color blind but none of their daughters are color blind. color blindness is likely 1)the result of having two few chromosomes 2)the result of having and extra chromosomes 3)a sex-linked trait 4)a ...
Tuesday, January 27, 2015 at 5:04pm

Science
If a 40 kg person is accelerating at 10 m/s^2, then the magitude of the force acting on him or her is 400 N. True False Is the answer True? Thank you
Tuesday, January 27, 2015 at 5:02pm

science
I need help Please!!!
Tuesday, January 27, 2015 at 4:22pm

Science
True / False: If a 40 kg person is accelerating at 10 m/s^2,then the magnitude of the force acting on him or her is 400 N. 1.How much force is needed to make a 60 kg object accelerate at a rate or 2.0 m/s ^2? 2.What is the acceleration of a 30 kg objedct when 180 n of force is...
Tuesday, January 27, 2015 at 12:17pm

Science
A male peacock displays his colorful tail feathers in order to 1) increase the success rate of asexual reproduction 2) increase the gestation period 3) release gametes into its surroundings 4) attract a mate I chose 4
Tuesday, January 27, 2015 at 11:04am

science
When a fan is turned on it changes electrical energy into blank energy is it ma. Motion b.magnetic c. Gravitational. D. Electromagnetic
Tuesday, January 27, 2015 at 10:44am

science
calculate the electric potential due to 0.001c0ulomb of charge at a distance of 100cm.
Tuesday, January 27, 2015 at 10:27am

Science
#1 Which of the following allows a plant's vascular system to work as a transport system? A A plant's vascular system is made up of specialized cells that move around the plant as it grows. B A plants vascular system is made up of specialized cells that are covered in ...
Tuesday, January 27, 2015 at 9:46am

science
The steel round frame is 2,4m high. There have to be wrapd five coils around the frame. One coil diameter is 35mm. Each coil is 50m long. All of the coils have to be wrapd next to each other.What must the diameter be of the frame if the hight of the frame is 2,4m.
Tuesday, January 27, 2015 at 5:42am

science
what is the centripetal of a 50.5-kg object traveling 25 m/s around a circular track with a radius of 10.0 m?
Monday, January 26, 2015 at 10:57pm

science
ok i had some trouble but i think i figured it out work= force *power??
Monday, January 26, 2015 at 8:40pm

science
Shoe companies imbed unique designs on bottom of the sneakers they manufacture.what is the made n purpose? A to increase potential energy B to decrease friction C increase friction D to decrease potential energy. I think its C am I correct?
Monday, January 26, 2015 at 8:17pm

Science
A lead fishing weight with a mass of 57g absorbs 146 cal of heat. If its initial temperature is 48 C, what is its final temperature?
Monday, January 26, 2015 at 8:01pm

science
which one of earth's layers has the hottest temperature? why?
Monday, January 26, 2015 at 7:46pm

Science
what is the controlled variable of a homemade stethoscope
Monday, January 26, 2015 at 7:39pm

science
How can a streak plate help you identify a mineral?
Monday, January 26, 2015 at 7:20pm

Science
What is the Independent variable of a homemade sterthoscopes
Monday, January 26, 2015 at 7:07pm

science
what is the weight on earth of an object that has a mass of 17kg?
Monday, January 26, 2015 at 5:25pm

Science
If the mass of a ball is 20g and h is 8m, calculate the kinetic energy when it has a velocity of 2ms raise to power minus 1
Monday, January 26, 2015 at 4:47pm

science
Bacteria are invisible to humans except under a microscope. Which evidence did Pasteur use to show that bacteria were the cause of soured wine? A. Heated wine did not sour B. Capped wine did not sour C. Filtered wine did not sour D. Chilled wine did not sour I need help to ...
Monday, January 26, 2015 at 4:45pm

science
what is active transport
Monday, January 26, 2015 at 4:03pm

science
passive transport involves movement of substances...... A) from areas of lower concentration areas of higher concentrations. B)from areas of higher concentrations to areas of lower concentration C) from areas which the concentration has reached a balance D) from areas of ...
Monday, January 26, 2015 at 4:00pm

science
how is osmosis different from diffusion?
Monday, January 26, 2015 at 3:57pm

science
which of the following correctly identifies active transport
Monday, January 26, 2015 at 3:56pm

Science
A certain object has a volume of 25.0 mL and a mass of 100 g. What is the density of the object?
Monday, January 26, 2015 at 3:39pm

Science
Check My Answers, please? Which of the following planets is considered a rocky, or terrestrial, planet? Venus **** Neptune Saturn Uranus Which of the following statements about the beginning of the solar system is true? The planets that formed closest to the sun became gas ...
Monday, January 26, 2015 at 3:35pm

physical science
A bungee jumper jumps from a high bridge 100 m above a river. How fast does he fall after he has covered 60 m after jumping from the bridge? (Ignore air resistance in the fall.)
Monday, January 26, 2015 at 1:19pm

science
A rectangular building lot is 1200 ft. by 120 ft. Determine the area of this lot.
Monday, January 26, 2015 at 12:31pm

Physical Science
A hot metal spoon with a mass of 77.0 grams and a temperature of 95.0 degrees celsius is placed into a cup containing 100 grams of water at 20 degrees celsius. When the spoon and water reach equilibrium, they both have a temperature of 25 degrees celsius. What is the spoon ...
Monday, January 26, 2015 at 12:22pm

Science
Explain how asexual reproduction occurs and how it limits the spread of harmful characteristics.
Monday, January 26, 2015 at 11:10am

Science
. To make a saturated solution, 36 g of sodium chloride is dissolved in 100 g of water at 293 K. Find the percent concentration at this temperature. 3. A solution of acetone contains 20 ml of acetone in 480 ml of water. Calculate the % concentration of solution
Sunday, January 25, 2015 at 11:58pm

science plz help right now!!!!
1.which of the following could be true of two different species that have a competive relationship in the same ecosystem? A.one species preys on the other B .the relationship is mutually beneficial. C.They share the same niche D.one species benefits, while the other is neither...
Sunday, January 25, 2015 at 5:27pm

accounting,life science,history and maths lit
What career path can I fellow doing these subjects?
Sunday, January 25, 2015 at 11:25am

concept development
Which of the following is the crux of the interrelationship between mathematics and science? A. About half of the basic math concepts are related to science concepts. B. The basic concepts of mathematics are the basic process skills of science. C. Basic mathematics process ...
Sunday, January 25, 2015 at 10:33am

Science
Identify and discuss at least two forces that would be involved when an elderly patient who is proped up at about 4 degrees in a bed and slowly slides down to an almost horizontal position?
Saturday, January 24, 2015 at 11:24pm

Science
For the dissociation of acetic acid, CH3COOH CH3COO- + H+, the free energy change, ΔG° = 27.26 kJ/mol. What is the free energy change, ΔG°', in the biochemical standard state? Given R = 8.315 J/mol · K. T = 25°C.
Saturday, January 24, 2015 at 12:57pm

concept development
Which of the following is not a reason to make mathematics and science instruction relevant? A. To protect schools from being sued for discrimination B. To consider diversity in race, ethnicity, social class, and gender C. To build on concepts that children learn before they ...
Saturday, January 24, 2015 at 11:30am

home economics
Please help me!,how is home economics related to mathematics,science and social,spiritual and moral education (ssme)?
Saturday, January 24, 2015 at 9:55am

accounting,life science and history
What course can I do in college o university and career job can I persue after I've got my degree
Saturday, January 24, 2015 at 7:57am

science
A tractor pulls a tree trunk across a horizontal piece of ground. If the force in a chain is 3000N and the chain forms an angle of 30 degrees with the ground, calculate the force with which the tree is pulled across the ground and the force with which the tree is lifted
Saturday, January 24, 2015 at 7:33am

Science plz help
Explain the basic parts of a major theme in molecular biology: the pathway of DNA to RNA to proteins. Include a general idea of what occurs at each stage
Friday, January 23, 2015 at 3:13pm

Science
1)What is the Theory of Plate Tectonics? 2)What physical features are caused by plate tectonics? 3)What causes Earth's plates to move continuously?
Friday, January 23, 2015 at 2:17pm

Science
How are Newton’s second and third laws of motion important to your everyday life?
Friday, January 23, 2015 at 12:59pm

science
the vapour pressure of pure liquid benzene and toluene are 160mm and 60 mm repectively. calculate the vapour pressure of an equimolar solution at the same temperature?
Friday, January 23, 2015 at 3:31am

ENGLISH
1.Is the group of words a simple sentence, a compound sentence, a run-on sentence, or a sentence fragment? Her computer has new software, it runs much faster now. A. run-on sentence B. sentence fragment** C. compound sentence D. simple sentence 2.Is the group of words a simple...
Friday, January 23, 2015 at 1:00am

science
The speed of a bullet as it travels down the barrel of a rifle toward the opening is given by v = (-4.25 10^7) t^2 + (3.45 10^5) t, where v is in meters per second and t is in seconds. The acceleration of the bullet just as it leaves the barrel is zero. (a) Determine the ...
Thursday, January 22, 2015 at 10:42pm

science
A ball is thrown upward from the ground with an initial speed of 16.0 m/s; at the same instant, another ball is dropped from a building 12 m high. After how long will the balls be at the same height above the ground?
Thursday, January 22, 2015 at 10:39pm

science
a satellites original velocity is 10,000 m/s. after 60 seconds, it is 5,000 m/s. what is the satellites acceleration
Thursday, January 22, 2015 at 9:49pm

science
a cars velocity changes from 0 m/s to 30 m/s in 10 sec. what is the cars average acceleration
Thursday, January 22, 2015 at 9:46pm

Science
Are these equations balanced or unbalanced 3. Cu+H2SO4 Yields CuSO4+H2 Balanced 4. 2Fe+3S Yields Fe2S3 Balanced 5.N2+H2 Yields NH3 Unbalanced Answer this Questio
Thursday, January 22, 2015 at 9:14pm

Science
true or False in a physical change some of the physical properties of substance may be altered and the chemical composition remains the same
Thursday, January 22, 2015 at 8:37pm

Science
True or False Another name for chemical change is chemical bond
Thursday, January 22, 2015 at 8:35pm

Science
Are these equations balanced or unbalanced 6. 2AlN Yields 2Al+N2 Balanced 7.Mg(OH)2+2HCl Yields MgCl2+2H2O Balanced 8. K+H2O Yields H2+KOH Unbalanced
Thursday, January 22, 2015 at 8:28pm

science
Which place is most likely to have cold weather and a cold climate year-round
Thursday, January 22, 2015 at 8:24pm

Science
Are these equations balanced or unbalanced 3. Cu+H2SO4 Yields CuSO4+H2 Balanced 4. 2Fe+3S Yields Fe2S3 Balanced 5.N2+H2 Yields NH3 Unbalanced
Thursday, January 22, 2015 at 8:22pm

Science
Are these equations balanced or unbalanced 1. Mg + 2HCl Yields MgCl2+H2 Balanced 2.H2+O2 Yields H2O Unbalanced
Thursday, January 22, 2015 at 8:19pm

Conceps of development
Which of the following is the crux of the interrelationship between mathematics and science? A. About half of the basic math concepts are related to science concepts. B. The basic concepts of mathematics are the basic process skills of science. C. Basic mathematics process ...
Thursday, January 22, 2015 at 7:34pm

math
sharon completed her reading homework in 2/3 hour.she completed her science homework in 5/6 hour. how much longer did it take sharon to complete her science homework
Thursday, January 22, 2015 at 5:58pm

science
how can you represent temperature in scientific terms??
Thursday, January 22, 2015 at 5:48pm

Science Ecosystem Exam
A biologist studying a desert ecosystem observes that the population of a lizard species increases following particularly hot, dry period that causes a snake population to decline. What could the biologist hypthesize about the roles of these two species? A) The lizard preys on...
Thursday, January 22, 2015 at 2:06pm

Science
If you have a beaker that contains 100ml at 40 degrees and a beaker that contains 200ml at 25 degrees. After a while the temperature of both liquids have decreased. In terms of energy describe what has happened to the liquids.
Thursday, January 22, 2015 at 11:37am

accounting,life science,history and maths literacy
What can I study after matric and what career job can I persue? Please help I'm confused
Thursday, January 22, 2015 at 11:35am

science
Some hypothetical metal has the simple cubic crystal structure. If its atomic weight is 70.4 g/mol and the atomic radius is 0.126 nm, compute its density in g/cc.
Thursday, January 22, 2015 at 10:26am

Science
Which foods are lipids found in, and what is their function in the body? A: lipids are found in sugars and starches and are the main source of energy for the body B: lipids are found in fats and oils and are an essential component of cell membranes C: lipids are found and fats...
Thursday, January 22, 2015 at 10:25am

Science
Every individual including young people can make decisions to use resources wisely use the terms reduce reuse and recycle to explain how the students in the image above can help minimize solid waste. HELP LAST DAY TO DO THIS I NEED AN ANSWER.
Thursday, January 22, 2015 at 9:55am

science
Locate and click on this section of the geologic time scale, and list the other possible names that could have been used to describe this era, and why?
Thursday, January 22, 2015 at 3:53am

computer science
a program to input the prices of two items as well as the quantities purchased, and compute the amount of the sale. Use both pseudo code and flowchart diagrams.
Thursday, January 22, 2015 at 3:36am

Science
The cell theory was A: developed by Robert Hooke B: developed before microscopes were invented C: developed only after electron microscopes became widely used D: developed by many scientists over many years Is the answer A?
Wednesday, January 21, 2015 at 11:32pm

physical science
if you drop an object from a height of 0.8m, it will hit the ground in 0.40s. if you throw a baseball horizontally with an initial speed of 29m/s from the same height, how long will it take the ball to hit the ground
Wednesday, January 21, 2015 at 11:17pm

Science
Most bacteria are A: unicellular eukaryotes B: unicellular prokaryotes C: multicellular eukaryotes D: multicellular prokaryotes Is the answer B?
Wednesday, January 21, 2015 at 11:14pm

Science
Which foods are lipids found in, and what is their function in the body? A: lipids are found in sugars and starches and are the main source of energy for the body B: lipids are found in fats and oils and are an essential component of cell membranes C: lipids are found and fats...
Wednesday, January 21, 2015 at 11:03pm

Science
Oxygen moving from the bloodstream into a cell down a concentration gradient is a form of A: osmosis B: endocytosis C: Active transport D: passive transport Is the answer D?
Wednesday, January 21, 2015 at 10:32pm

Science
Is the gene for sickle cell anemia more likely to be dominant or recessive?
Wednesday, January 21, 2015 at 9:34pm

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