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July 25, 2014

Homework Help: Science

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Recent Science Questions

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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

physical science
How much time is needed for a car to accelerate from 8.0 m/s to speed of 22 m/s if the acceleration is 3.0 m/s^2?
Wednesday, January 29, 2014 at 8:54pm

science
Carbon dioxide is obtained from the air and changed into carbohydrates and oxygen during the process of A) fossilization. B) respiration. C) digestion. D) photosynthesis
Wednesday, January 29, 2014 at 8:53pm

science
Granite is an igneous rock that forms from magma cooled below Earth's surface.Why would granite have larger crystals than igneous rocks formed from lava cooled above Earth's surface?
Wednesday, January 29, 2014 at 8:41pm

Science ~ Structures and Properties of Matter
How do the principles of convection, conduction, and radiation explain how the water in the saucepan gets hot? Help ME PLEASE! PLEASE
Wednesday, January 29, 2014 at 8:16pm

math
the ratio to the number of mystery books to the number of science fiction books is 4:3 the ratio of the number of science fiction books to the number of biographies is 4:5 if there are 48 science fiction books, find the total number of books using bar model
Wednesday, January 29, 2014 at 7:50pm

Science
1. The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates A. drinking water. B. smog. C. pesticides. D. acid rain. D? 2. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. ...
Wednesday, January 29, 2014 at 7:23pm

Physical Science
How does the potential energy of an object change when its height is tripled?
Wednesday, January 29, 2014 at 6:20pm

Environmental Science
An effective approach to preventing future shortages of usable water should focus on?
Wednesday, January 29, 2014 at 3:15pm

science(1answer)
4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast? A.the train has less kinectic energy than the car. B.the train has more kinectic energy than the car.(I PICK THIS) C.the ...
Wednesday, January 29, 2014 at 1:37pm

Science
A ball is thrown upward at 20 metres per second off the top of a building that is 12 m high. What is the height of the ball above the ground at its highest poin?
Wednesday, January 29, 2014 at 1:15pm

science (check answers)
4.how does the kinectic energy of a 10,000-kg train traveling at a speed of 10 m/s compare with that of a 2,600-kg compact car traveling twice as fast? A.the train has less kinectic energy than the car. B.the train has more kinectic energy than the car.(I PICK THIS) C.the ...
Wednesday, January 29, 2014 at 12:53pm

science(check answers)
2.how would the kinetic energy of a 12,000-kg train compare with the kinectic energy of a 900-kg compact car if both were traveling at the same speed? A.the trains kinectic energy would be equal to the cars kinectic energy. B.the trains kinectic energy would be greater than ...
Wednesday, January 29, 2014 at 12:37pm

science(check answers)
1. A 60-kg cheetah reaches a speed of 30 m/s as it chases its prey.What is the kinetic energy of the cheetah? A.900 j B. 1,800 j C.27,000 j D. 54,000 j
Wednesday, January 29, 2014 at 12:15pm

Science
1. Which of the following is true about mixtures? (1 point) Mixtures consist of two or more substances chemically combined. Mixtures cannot be separated by physical means. Mixtures consist of only one kind of atom. ***Mixtures have two or more substances mixed together, but ...
Wednesday, January 29, 2014 at 11:18am

Maths lit,geo,science,l.o,life science,eng
Im doing those subjects and i would like you guys to help me out...what carrer can i do...im a matriculant im so stressed
Wednesday, January 29, 2014 at 10:00am

Science ~CHECK MY WORK PLEASE~
A scientist is trying to determine the identity of an element. It is highly reactive in water and forms an ionic bond with chlorine. It is also very shiny. The element is likely A. From Group 17 ********** B. From Group 1 C. From Group 15 D. A Noble Gas Which is most likely to...
Tuesday, January 28, 2014 at 11:31pm

SCIENCE
are these magnetsattracting or repelling each other?how can you tell
Tuesday, January 28, 2014 at 10:29pm

Science
43Lb has a half life of 42 minutes. If you start with 100 grams, how many grams will you have after 84 minutes?
Tuesday, January 28, 2014 at 8:05pm

Science -CHECK MY WORK-
a.) How can you describe the location of vanadium (V, atomic number 23) on the periodic table? Choose all that apply. 1. period 5, group 4 <<<My choices>>> 2. period 4, group 5 3. lanthanum series <<<My choices>>> 4. nonmetals 5. transition ...
Tuesday, January 28, 2014 at 7:41pm

Science
Think of 5 adaptations for a made up animal in an aquatic environment
Tuesday, January 28, 2014 at 6:57pm

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...
Tuesday, January 28, 2014 at 4:43pm

computer Science
18 You started your new job as a PC tech and are at a customer’s house. The computer has failed to boot. The fan is running but the POST fails every time. What is the best thing to do to possibly find quickly? a. Check the electrical outlet the computer is ...
Tuesday, January 28, 2014 at 4:42pm

Science ~ Structures and Properties of Matter
1) Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Tuesday, January 28, 2014 at 4:12pm

science ~CHECK MY WORK PLEASE~
1) Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means. B. both substances have a set ratio of atoms that can be separated by physical means. C. both ...
Tuesday, January 28, 2014 at 3:41pm

Science ~CHECK MY WORK PLEASE~
Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the ...
Tuesday, January 28, 2014 at 3:24pm

Science ~CHECK MY WORK PLEASE~
Both carbon dioxide and water are pure substances. How are they similar to each other? A.) both substances have a set ratio of atoms that cannot be separated by physical means. B.) both substances have a set ratio of atoms that can be separated by physical means. C.) both ...
Tuesday, January 28, 2014 at 3:21pm

science---1 question
help pls asap! 2) Which of the following is a pure substance? (1point) Chocolate milk Orange juice Seawater Hydrogen peroxide (H2O2) i first thought it was C (seawater) but is it D (H2O2)!??
Tuesday, January 28, 2014 at 3:05pm

Physical Science
A machine you designed has an efficiency of 60%. What happens to 60% of the work put into the machine, and what happens to the other 40%?
Tuesday, January 28, 2014 at 2:55pm

science
a framed painting weighs 220 newtons. the 2 wires support an angle of 120 degrees with each other. what are the tensions on the wire?
Tuesday, January 28, 2014 at 2:44pm

EARTH SCIENCE- SO STUCK
How far from an earthquake epicenter is a city where the difference between the P-wave and the S-wave arrival times is 5 minutes and 00 seconds?
Tuesday, January 28, 2014 at 1:41pm

Science
Which of the following is disadvantage of internal fertilization? A. Gametes are released into the surroundings. B. Gametes may get washed away. C. The developing zygote is protected. D. Larger numbers of eggs can be fertilized at one time
Tuesday, January 28, 2014 at 1:08pm

Physical science
State the mathematical relationship between the net force acting on an object and the time taken to change the objects momentum
Tuesday, January 28, 2014 at 12:55pm

Science
A male peacock displays his colorful tail in order to...... A. increase the success rate of asexual reproduction B. increase the gestation period. C. release gametes into his surroundings D. attract a mate
Tuesday, January 28, 2014 at 12:52pm

Science
A 15.3 kg object is dropped from an initial height of 33.5m above the ground. Find the speed when it hits the ground.
Tuesday, January 28, 2014 at 12:47pm

Science
Seahorses change color and swim together in predetermined ways before mating. The behaviors are called....... A.asexual reproduction. B. sexual reproduction. C. courtship rituals. D. budding.
Tuesday, January 28, 2014 at 12:28pm

Science
Which era of geologic time was the longest? HOLOCENE PLEISTOCENE PLIOCENE MIOCENE OLIGOCENE EOCENE PALEOCENE
Tuesday, January 28, 2014 at 12:19pm

Science
Some animals, but not humans, have an organ called a gizzard located near the top of their digestive tract. This organ is small and can contain small rocks. It also has thick, muscular walls. Based on this physical description, which of the following is most likely to be the ...
Tuesday, January 28, 2014 at 12:41am

Science: Discovering Magnetism
How is the strength of two magnetic poles related to the force between them?
Monday, January 27, 2014 at 11:58pm

Science
Why do you think the national weather service has standard conditions for measuring air temperature?
Monday, January 27, 2014 at 9:41pm

science
joey drives his car 7 kilometers north. he stops for lunch and then drives 5 kilometers south. what distance did he cover?
Monday, January 27, 2014 at 7:32pm

Science: Bird Project
I'm doing a project about the Northern Oriole. It's a mini project. What's the difference between the Northern Oriole and the Baltimore Oriole?
Monday, January 27, 2014 at 7:11pm

Physical Science
A 50.0-kg wolf is running at 10.0 m/sec. What is the wolf's kinetic energy? A) 5 J B) 500 J C) 5000 J D) 250 J E) 2500 J
Monday, January 27, 2014 at 4:07pm

Science
a 67 gram chunk of ice (Heat of Fusion = 6.0 kJ/mol) in a beaker immersed in a water bath. To produce just enough heat to melt the ice, how many moles of solid NaOH (Heat of Solution = -445.1 kJ/mol) must be added to this system to just melt the ice. (Moles)
Monday, January 27, 2014 at 3:58pm

gifted talented science
pls, help! this is hard and confusing! 1. How does runoff affect a community? (1 point) Runoff can supply new homes and businesses with the water that they need. Runoff can provide the water that fish in streams and lakes rely on. Runoff can prevent streams and lakes from ...
Monday, January 27, 2014 at 10:13am

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