Science

Recent Questions

Science
Which explains how plants can chemically weather a rock? A. Plant roots get into cracks and secrete water, which freezes and breaks apart the rocks. B. Plant roots get into cracks, grow, and break apart the rocks. C. Plant roots get into cracks and secrete acids, which freeze ...

Science
1. Which of the following best summarizes the function of the respiratory system? A. to transport oxygen to cells and wastes away from cells. B. to protect the organs in the chest cavity C. to move oxygen from the air into the body and carbon dioxide from the body into the air...

Science
Please could someone check these for me. 1In a series of rock layers, a geologist finds fossils of a lizard-like dinosaur and a fern-like tree in layers that are 1.0 m and 1.5 m deep. However, in a layer that is 2.0 m deep, he finds fossils of bony fish and shellfish. Which ...

7th grade science
Can you help me with genetics questions? Directions: In each set, tell which word does not fit with the others. Then explain why you think it does not. You must mention all words. 1. Aa, Heterozygous, Hybrid, Homozygous Ans: Homozygous doesn't belong because letters are mixed...

science
In the below the results are given for the saprate mating of tomato plant what are the most probable genotype for the parents in each instance? 1.purple, cut¡Ágreen cut- cut purple-321, potato purple-101, cut green-310, potato green-107 2.purple, cut¡Ápurple potato-cut ...

Science!!
**PLEASE HELP FAST** how is newton's second and third law of motion important to your everyday life?? **PLEASE HELP**

Physical science
Which property of aluminium makes it suitable to be used for overhead electricity cables

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.

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 elements as Earth's crust. 

Earth Science
   What element has 81 protons in the nuclei of its atoms?  A. Thallium B. Uranium C. Platinum D. Lead A?

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?

Earth Science
Please check down below.

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. Diamonds form in kimberlites under very ...

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.  A?       

science
If a kestrel eats a mouse that eats grass, the kestrel is a

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 ...

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 ...

Partly science, partly curiosity
Does iodized salt mold?

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 ...

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

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

science
most bacteria are A) unicellular eukaryotes B) unicellular prokaryotes C) multicellular eukaryotes D) multicellular prokaryotes

science and technology engineering mathematics
Do you have sites that can help me understand science and technology engineering mathematics?

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 ...

Earth Science
Describe how weathering and erosion can be both destructive or constructive. I am still confused on the difference of erosion and weathering...

science gases
The air that you breathe is a gas.List other gases that you have heard about in a science class.

science
When the temperature of the air in a hot air balloon increases, what happens to the volume of the gas?

science
for every cubic meter of 30 degrees celsius saturated coded to 16 degrees celsius fowmany grams lost

science
how do measure density

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

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? Tries...

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 ...

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

science
I need help Please!!!

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...

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

science
When a fan is turned on it changes electrical energy into blank energy is it ma. Motion b.magnetic c. Gravitational. D. Electromagnetic

science
calculate the electric potential due to 0.001c0ulomb of charge at a distance of 100cm.

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 a thick ...

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.

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?

science
ok i had some trouble but i think i figured it out work= force *power??

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?

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?

science
which one of earth's layers has the hottest temperature? why?

Science
what is the controlled variable of a homemade stethoscope

science
How can a streak plate help you identify a mineral?

Science
What is the Independent variable of a homemade sterthoscopes

science
what is the weight on earth of an object that has a mass of 17kg?

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

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 ...

science
what is active transport

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 ...

science
how is osmosis different from diffusion?

science
which of the following correctly identifies active transport

Science
A certain object has a volume of 25.0 mL and a mass of 100 g. What is the density of the object?

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.)

science
A rectangular building lot is 1200 ft. by 120 ft. Determine the area of this lot.

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 ...

Science
Explain how asexual reproduction occurs and how it limits the spread of harmful characteristics.

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

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...

accounting,life science,history and maths lit
What career path can I fellow doing these subjects?

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 ...

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?

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.

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 ...

home economics
Please help me!,how is home economics related to mathematics,science and social,spiritual and moral education (ssme)?

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

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

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

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?

Science
How are Newton’s second and third laws of motion important to your everyday life?

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?

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...

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 ...

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?

science
a satellites original velocity is 10,000 m/s. after 60 seconds, it is 5,000 m/s. what is the satellites acceleration

science
a cars velocity changes from 0 m/s to 30 m/s in 10 sec. what is the cars average acceleration

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

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

Science
True or False Another name for chemical change is chemical bond

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

science
Which place is most likely to have cold weather and a cold climate year-round

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

Science
Are these equations balanced or unbalanced 1. Mg + 2HCl Yields MgCl2+H2 Balanced 2.H2+O2 Yields H2O Unbalanced

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 ...

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

science
how can you represent temperature in scientific terms??

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...

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.

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

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.

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...

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.

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?

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.

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?

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

Science
Most bacteria are A: unicellular eukaryotes B: unicellular prokaryotes C: multicellular eukaryotes D: multicellular prokaryotes Is the answer B?

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