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September 20, 2014

Homework Help: Science

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Recent Science Questions

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Science
2. According to the continental drift theory, which of the following land regions should show the greatest similarities in fossil types? (1 point) A) east coast of South America and west coast of Africa B) east coast of South and west coast of South America C) northern coast ...
Tuesday, February 4, 2014 at 5:43pm

science
Choose one primary reference that uses cultured cells as an experimental model. Describe briefly the type of cells used, why these particular cells were useful for the study and how they are used. List two ways in which the cells used in the study would resemble cells that are...
Tuesday, February 4, 2014 at 4:58pm

science
briefly describe two types of microscopes other than light microscopes, and explain for what purposes they would be used.
Tuesday, February 4, 2014 at 4:57pm

science(check asnwer) !!
please check my answer shoe companies imbed unique designs on the bottoms of the sneakers they manufacture.what is the main purpose of the designs on the bottoms of sneakers? A.to increase potential energy B. to decrease friction C. To increase friction(I PICK THIS) D. To ...
Tuesday, February 4, 2014 at 4:52pm

science (check new answer)
please check my answser .A car driver accelerates to a speed of 35 mph and then takes her foot of the gas pedal.Even though she does not press the brake pedal at any time,she eventually rolls to a stop.which of the following most likely causes the car to come to a stop? A....
Tuesday, February 4, 2014 at 4:31pm

Science.
Which abiotic factor is essential to all aquatic ecosystems except ocean hydrothermal vents, and why? Phytoplankton, because it provides a source of food salt, because it provides a source of minerals deep water, because it provides the necessary environment for organisms to ...
Tuesday, February 4, 2014 at 4:30pm

Science
Which word or phrase below best describes the function of the urinary bladder? a. filter b. storage tank c. blender d. passageway B A patients comes in to see a physician. This patient lacks the ability to keep warm and needs to wear heavy clothing even during mild ...
Tuesday, February 4, 2014 at 4:08pm

REVISION
what good websites are there that help with science and maths revision? I have tried Google but there is nothing that has interested me. Also the websites, which are a good source of revision i.e. Bite size etc. Are already what I am using. I have asked around but there no one...
Tuesday, February 4, 2014 at 3:37pm

Science help.
Which of the following characteristics of the Arctic rabbit is specifically an adaptation to living in the tundra? small size keen eyesight strong legs white fur*** Which set of words below could be used to describe the dispersal of seeds to a new region? wings, legs, ...
Tuesday, February 4, 2014 at 3:32pm

science
please help me im stuck on this last one !! .A car driver accelerates to a speed of 35 mph and then takes her foot of the gas pedal.Even though she does not press the brake pedal at any time,she eventually rolls to a stop.which of the following most likely causes the car to ...
Tuesday, February 4, 2014 at 3:29pm

Science
Which of the following characteristics of the Arctic rabbit is specifically an adaptation to living in the tundra? A) Small Size B) Keen eyesight C) Strong Legs D) White Fur** I think it's D, but I'm just not sure...
Tuesday, February 4, 2014 at 2:59pm

science
According to Newton's Second Law of Motion, when an object is acted on by an unbalanced force, how will that object respond?
Tuesday, February 4, 2014 at 2:09pm

Science~!!!
In order to release the energy stored in fossil fuels, they must be (1 point) Burned*** Refined into gasoline Mined from below the surface of earth Transported to a power plant Coal is a fossil fuel that is relatively inexpensive. This is one reason many people choose to use ...
Tuesday, February 4, 2014 at 1:43pm

Maths literacy,life science,geography and economics
What job will i work?
Tuesday, February 4, 2014 at 11:57am

science
in the purification of copper,which electrode should be connected to the positive terminal of the battery and why?
Tuesday, February 4, 2014 at 11:05am

science
how can diseases like AIDS be prevented?
Tuesday, February 4, 2014 at 11:00am

science
In which of the following units is acceleration expressed? A.Newtons B.foot-pounds c.Kilograms
Tuesday, February 4, 2014 at 8:24am

science
plz any one i am abit confused can you answer these questions thx 05. The space surrounding a charge within which the influence of its charge extends is known as. (a) Electric field (b) Magnetic field (c) Line of force (d) Electric intensity 06. A region around a stationary ...
Tuesday, February 4, 2014 at 5:45am

science
A ball weighing 1.78 N is shot through a launcher,achieving a speed (from rest) of 41 m/s in 0.28s. What is the mass of the ball.
Monday, February 3, 2014 at 11:37pm

physical science
Explain using newtons first law why traveling car using a rope is dangerous compared using a steel car
Monday, February 3, 2014 at 11:00pm

science
A solutuion is prepared by adding 40 grams of NaC1 to 100 grams of water at 80 degrees Celcius. Describe this solution.
Monday, February 3, 2014 at 10:08pm

Science
whats the whole idea of gearing up and/or down in robotics? (someone mentioned it's like stick shift-but I don't drive so...) when is it each one?
Monday, February 3, 2014 at 7:16pm

Science
What are Antibiotics?
Monday, February 3, 2014 at 4:17pm

Science
1. A corn plant over the course of a summer can weigh 500 grams (dry biomass, after removing the water), yet it starts from a seed that weighs less than 1 gram. What is the primary source of this increased mass? What process(es) are responsible for the gain in mass? Explain. 2...
Monday, February 3, 2014 at 4:14pm

Science
During the process of photosynthesis, plants convert carbon dioxide and water into glucose. Covalent bonds hold the glucose molecules together. The breaking of the covalent bonds during digestion releases energy. the type of energy released is A.nuclear energy B.kinetic energy...
Monday, February 3, 2014 at 4:04pm

Science Help!
3. Using coal for fuel releases pollution into the atmosphere. Why do people continue to use coal if it causes pollution? A. Using more coal reduces the amount of pollution from using oil B. Using coal is relatively inexpensive. C. Mining coal helps scientist uncover fossils D...
Monday, February 3, 2014 at 4:03pm

Science--Physics--check answers
1. A football player pushes a dummy forwards at a constant 0.85m/s for 11m using 7150 J of energy. The dummy has a mass of 120 kg. Find the force the football player exerts, find the frictional force the dummy exerts. - for my answer I got 1176N as the force the football ...
Monday, February 3, 2014 at 3:39pm

science
which of the following is not a method of asexual reproduction ? a) regeneration b) vegetative propagation c) budding d) meiosis e) mitisos
Monday, February 3, 2014 at 3:03pm

Help with science
1. Aquaculture is the practice of farming sea organisms as a renewable food source. A. True B. False. 2. Selectively cutting down trees on an area of land can be best described as A. cutting down certain trees while leaving other trees standing B. cutting down all of the trees...
Monday, February 3, 2014 at 2:35pm

computer Science
17 You purchase a used optical drive from a second and store replace a single optical drive that has gone bad on your desktop. How would you set the jumper? a. Single b. Cable select c. Master d. Slave
Monday, February 3, 2014 at 1:53pm

computer Science
17 You purchase a used optical drive from a second and store replace a single optical drive that has gone bad on your desktop. How would you set the jumper? a. Single b. Cable select c. Master d. Slave
Monday, February 3, 2014 at 1:51pm

computer Science
14 Your brother is going to serve in the military overseas for four years and asks you about storing his computer in a public storage facility while he is away. The storage unit is not temperature controlled. What could be the negative impact of doing this? a. The internal ...
Monday, February 3, 2014 at 1:49pm

Science
1. Aquaculture is the practice of farming sea organisms as a renewable food source. A. True B. False. 2. Selectively cutting down trees on an area of land can be best described as A. cutting down certain trees while leaving other trees standing B. cutting down all of the trees...
Monday, February 3, 2014 at 1:46pm

Science
I don't understand these problems can you help me. Multiple Choice 1. At the chromosomal level, what is the difference between human males and human females? (1 point)All males have a Y chromosome, and females do not. All males have an X chromosome, and females do not. All...
Monday, February 3, 2014 at 12:59pm

Science
Which Of the following differs when comparing the deep ocean to the intertidal zone?? A) Need for Energy B) Salinity C) The amount of sunlight* D) Reliance on phytoplankton
Monday, February 3, 2014 at 12:00pm

SCIENCE --- CHECK MY WORK PLS
help pls, check my work asap!?? 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 ...
Monday, February 3, 2014 at 11:48am

computer Science
14 Your brother is going to serve in the military overseas for four years and asks you about storing his computer in a public storage facility while he is away. The storage unit is not temperature controlled. What could be the negative impact of doing this? a. The internal ...
Monday, February 3, 2014 at 10:42am

EARTH SCIENCE
When the water level of a stream or river exceeds its natural banks, it has reached its
Monday, February 3, 2014 at 9:19am

science
You measure the dimensions of a rectangular block of aluminum to determine its volume. It has the following dimensions. length = 10.27 cm; width = 4.92 cm; height = 1.53 cm Assuming that each of these measurements is accurate to the nearest 0.01 cm, find the volume of the ...
Monday, February 3, 2014 at 1:06am

Science
The sensitivity of a measuring instrument is the value of the smallest quantity that can be read or estimated with it. What is the smallest part of a centimeter that can be read with the following? (a) a meterstick with markings at each millimeter I tried .01 mm .05 mm .1 mm ....
Monday, February 3, 2014 at 12:40am

Science
Does foam prevent convection? If not, what does it prevent? (radiation and conduction)
Sunday, February 2, 2014 at 11:36pm

Science
Use the Particle Theory of matter to explain what viscosity in and why temperature affects viscosity.
Sunday, February 2, 2014 at 11:00pm

science(2 Qs)
PLEASE ANSWER MY 2 QUESTIONS IN SCIENCE THANKS 3.when a negatively charged object moves in the opposite direction of an electric force field,the potential energy of the object. A.becomes zero(I PICK THIS) B.increases C.decreases D.stays the same 4.the two south pole ends of ...
Sunday, February 2, 2014 at 10:13pm

Science
Which of the following would be true during the inhalation phase of breathing? A. lungs are inflated, oxygen concentration is high, and carbon dioxide concentration is low in the alveoli. B. lungs are deflated, oxygen concentration is high, and carbon dioxide concentration is ...
Sunday, February 2, 2014 at 8:47pm

Science
Pneumonia is a disease that causes fluid to build up in the alveoli of the lungs. Which of the following would you expect to be impaired in patients with pneumonia? A. movement of carbon dioxide out of body cells. B. movement of carbon dioxide out of the blood. C. movement of ...
Sunday, February 2, 2014 at 8:39pm

science(2 QUESTIONS)
PLEASE ANSWER MY 2 QUESTIONS IN SCIENCE THANKS 3.when a negatively charged object moves in the opposite direction of an electric force field,the potential energy of the object. A.becomes zero(I PICK THIS) B.increases C.decreases D.stays the same 4.the two south pole ends of ...
Sunday, February 2, 2014 at 8:16pm

Science
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 D...
Sunday, February 2, 2014 at 8:05pm

science
How often would a restriction enzyme such as Not I, which has 8 nucleotides in its recognition sites 5’-GCGGCCGC-3’, cleave DNA on average? Would it cleave a species DNA more or less often if the DNA from that species were 70% A-T rich?
Sunday, February 2, 2014 at 7:57pm

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
Sunday, February 2, 2014 at 7:16pm

Science (Chemistry)
A student mixes 35.0 mL of 2.82 M Pb(NO3)2(aq) with 20.0 mL of 0.00221 M Na2C2O4(aq). How many moles of PbC2O4(s) precipitate from the resulting solution? What are the values of [Pb2 ], [C2O42–], [NO3–], and [Na ] after the solution has reached equilibrium at 25 °...
Sunday, February 2, 2014 at 7:16pm

Science
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 D...
Sunday, February 2, 2014 at 6:59pm

Physical Science
Explain the energy conversions that occur as a basketball falls, hits the ground, and bounces back up. Ignore frictional forces.
Sunday, February 2, 2014 at 6:02pm

law
Ron supervises delivery of flowers for a wholesale distributor of fresh flowers, Flowers. Inc. In order to accommodate one of the company’s best customers, Ron offers to immediately rush a delivery of fresh peonies. All of the delivery trucks are currently out on delivery...
Sunday, February 2, 2014 at 5:31pm

Science
Name the components of the respiratory system in the order incoming air would encounter them during breathing. A. trachea, pharynx, larynx, alveoli, bronchi B. bronchi, larynx, alveloi, trachea, pharynx C. larynx, trachea, bronchi, pharynx, alveoli D. pharynx, larynx, trachea...
Sunday, February 2, 2014 at 5:11pm

Science
Name the components of the respiratory system in the order incoming air would encounter them during breathing. A. trachea, pharynx, larynx, alveoli, bronchi B. bronchi, larynx, alveloi, trachea, pharynx C. larynx, trachea, bronchi, pharynx, alveoli D. pharynx, larynx, trachea...
Sunday, February 2, 2014 at 3:49pm

science
Extraction of copper
Sunday, February 2, 2014 at 4:27am

Science
1. A clementine in my fridge is covered with a nice blue-green lawn of mold, a common decomposer. Assuming that the clementine did not dry out, what do you predict is the weight of the clemintine and mold together compared to the starting weight of the clementine and WHY? 2. ...
Saturday, February 1, 2014 at 9:26pm

science
Where can I find information on Energy reformation for a middle school student to understand?
Saturday, February 1, 2014 at 9:20pm

physical science
a weigh lifter raises a 70-kg barbell from the floor to a height of 2.2 m in 1.2s what was his average power output during the lift?
Saturday, February 1, 2014 at 5:54pm

College science
Im in Chem. but looks like physics.. If a rock climber accidentally drops a 70.5 g piton from a height of 295 meters, what would its speed be just before striking the ground? Ignore the effects of air resistance.
Saturday, February 1, 2014 at 4:34pm

Science
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite B? 2. A common characteristic of mountains formed by two colliding continents is marine _______ rock. A. sedimentary B. metamorphic C. limestone D. igneous A...
Saturday, February 1, 2014 at 3:54pm

SCIENCE
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite A? 2. All the processes that form mountain ranges are known as A. arch vibrations. B. compressive forces. C. orogeny. D. island arcing. C? 3. _______ describes...
Saturday, February 1, 2014 at 3:39pm

Science
Can someone define mesosphere (mantle)- Upper and lower?
Saturday, February 1, 2014 at 2:35pm

science
Write a balanced equation to describe the following reactions: a) C14H30 is cracked to produce ethene, hydrogen and one other compound b) C16H34 is cracked to produce ethene and propene in a 2:1 ratio and only one other compound
Saturday, February 1, 2014 at 2:31pm

Science
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite A? 2. All the processes that form mountain ranges are known as A. arch vibrations. B. compressive forces. C. orogeny. D. island arcing. C? 3. _______ describes...
Saturday, February 1, 2014 at 2:20pm

Biology/Science
1. A corn plant over the course of a summer can weigh 500 grams (dry biomass, after removing the water), yet it starts from a seed that weighs less than 1 gram. What is the primary source of this increased mass? What process(es) are responsible for the gain in mass? Explain. 2...
Saturday, February 1, 2014 at 1:56pm

science - gas chromatography
why is retention and peak width measured in time? is there a better theoretical parameter?
Saturday, February 1, 2014 at 1:53pm

science
. An ice cube of 48.7 grams is just beginning to melt. It is dropped into a swimming pool with a temperature of 26.0 ºC. How much heat will the ice cube absorb from the water in the swimming pool?
Friday, January 31, 2014 at 1:59pm

science
Can someone help me with mechanics. I need to check my answers
Friday, January 31, 2014 at 12:12pm

science
A car with a mass of 2.000 kilograms is moving around a circular curve at a uniform velocity of 25 meters per second. The curve has a radius of 80 meters what is the centripetal force on the car A.625N B.703N c. 15,625N D.20,250N
Friday, January 31, 2014 at 11:38am

science
In which of the following units is acceleration expressed a.Newton b.foot-pound
Friday, January 31, 2014 at 11:00am

science
The Earth is a satellite of the sun? If not can you tell me what it is?
Thursday, January 30, 2014 at 11:19pm

science
A steel block has a volume of 0.08m3 and a density of 7,840kg/m3 what is the force of gravity acting on the block(the weight in water?
Thursday, January 30, 2014 at 11:12pm

science
An object with a mass of 21 kilograms is lifted through a distance of 7 meters. How much work is done A. 147j B.703n c.15,625N
Thursday, January 30, 2014 at 9:18pm

6th grade honor science
having trouble with this question it was fill in the blank it was In a food web, an organism that eats an animal is a blank consumer
Thursday, January 30, 2014 at 8:54pm

science
If the student opened the bag after the above experiment, what would happen to volume of gas inside? A. The volume of gas in the bag will stay the same. B. the volume of gas in the bag will be decrease. C. The volume of gas in the bag will be increase. D. the volume of gas in ...
Thursday, January 30, 2014 at 7:11pm

help me with this language arts.
Multiple Choice 1. A court order that integrated the schools in a city would (1 point) bring students of different races together. close down the schools. keep students of different races apart. 2. Read the following passage from Through My Eyes: After the first day, I was ...
Thursday, January 30, 2014 at 6:22pm

Science
Which of the following shows the correct order from coldest to hottest average annual temperature? a. Taiga-Tundra-Rainforest-Temperate forest b. Rainforest-Temperate forest-Taiga-Tundra c. Temperate forest-Taiga-Tundra-Rainforest d. Tundra-Taiga-Temperate forest-Rainforest*
Thursday, January 30, 2014 at 6:10pm

Science
Which of the following determines the type of biome classification that will be made for a particular reason? a. Climate* b. Size c. Mineral deposits d. Number of human settlements
Thursday, January 30, 2014 at 6:01pm

science
Provide at least two modern examples of how the United States has increased its food production.
Thursday, January 30, 2014 at 2:59pm

science
in a gasoline engine, the area in the cylinder head where the air-end and-fuel mixture is burned is called the A. piston B. cylinder c. combustion chamber D. intake valve
Thursday, January 30, 2014 at 2:57pm

physical science
A rock thrown straight up climbs for 4.24 s, then falls to the ground. Neglecting air resistance, with what velocity did the rock strike the ground?
Thursday, January 30, 2014 at 2:12pm

science
liquid alcohol will change to vapor when its temperature reaches the A. boiling point B. fusing point C. freezing point D. melting point
Thursday, January 30, 2014 at 2:07pm

Science
Does ΔT from evaportation increase or decrease with increasing molecular mass? Explain why?
Thursday, January 30, 2014 at 2:07pm

Science
Predict change in temperature for 1-butanol, CHSCH2CH2CH2OH, if same experiment were using 1-butanol?
Thursday, January 30, 2014 at 2:07pm

Science
Using concept of Surface Tension, explain why does the detergent cause the effect observed?
Thursday, January 30, 2014 at 2:05pm

Science
Explain why pentane has a significantly higher vapor pressure than 1-butanol?
Thursday, January 30, 2014 at 2:02pm

science
a silver bar 0.125 meter long is subjected to a temperature change from 2oo degrees celsius to 100 degrees Celsius what will the length of the bar be after the temperature change
Thursday, January 30, 2014 at 1:59pm

science
If the absolute temperature of gas is 600K, the temperature in degrees celsius is A.273 b.705c
Thursday, January 30, 2014 at 1:51pm

science --- check my answers!
help pls asap!!!!! check my answers!!! 4.) A certain object has a volume of 25.0 mL and a mass of 100g. What is the density of the object? a)0.250 g/mL b) 4.00/mL*** c)125 g/mL d) 2500 g/mL 5.)Which of the following is a chemical property of aluminum? a)The melting point of ...
Thursday, January 30, 2014 at 1:22pm

Science-check my answers plz
Which of the following explains why sunlight is important to aquatic ecosystems? Sunlight provides a source of heat energy to increase water temperatures. Sunlight keeps harmful bacteria from taking over aquatic ecosystems. Sunlight makes it possible for aquatic predators to ...
Thursday, January 30, 2014 at 12:47pm

Science
What is the mass of water that results from combining 2.0 g of hydrogen with 16.0 g of oxygen? 14.0 g (I'm thinking this.) 16.0 g 18.0 g 20.0 g
Thursday, January 30, 2014 at 11:36am

Science
a__has a definite shape and a definite volume
Thursday, January 30, 2014 at 10:29am

science
Ship made of iron doesn't sinks but iron nail sinks. Why?
Thursday, January 30, 2014 at 7:23am

Engineering science N4
Calculate the angle of projection of a projectile in order to hit a target 12km away.the initial velocity is 700m/s ant the time of the flight is 80seconds.
Thursday, January 30, 2014 at 4:57am

Engineering science N4
A ship is 100km north-west of cape town harbour and it sails directly north at a velocity of 30km/h in 8 hours.calculate its resultant speed with reference to the cape town harbour in magnitude and direction.
Thursday, January 30, 2014 at 4:52am

science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:49am

science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:48am

Science
plz any one these are some mcqs i am preparing for a test i m not sure with the answers of these mcqs this is not a homework not an online course exam so feel free to answer these thankx MCQS 01. Changes of equal magnitude are separated by some distance. If the changes are in ...
Thursday, January 30, 2014 at 2:47am

Science - Disproven Genetic Theory
What genetic theory has been disproven ?
Wednesday, January 29, 2014 at 8:54pm

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