Friday
April 29, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

science
3 Nitroglycerine is used as an explosive. The equation for the explosion reaction is: 4C3H5(NO3)3 ( l ) 12CO2 ( g) 1 10H2O ( l ) 1 6N2 ( g) 1 O2 ( g) a How many moles does the equation show for: i nitroglycerine? ii gas molecules produced? b How many moles of gas molecules are...
Friday, February 19, 2016 by Maya

science
why echo is weaker than original sound
Friday, February 19, 2016 by ayesha

science
You burn 6 grams of carbon in plenty of air: C ( s) + O2 ( g) = CO2 ( g) a What volume of gas will form (at rtp)? b What volume of oxygen will be used up?
Friday, February 19, 2016 by Maya

science
Why it is important to know the history of science in 300 words?
Friday, February 19, 2016 by deepak

Science
Does anyone know the answer to this? 2.50mL Fe =? atoms Fe, Dfe =7.87 g/mL
Thursday, February 18, 2016 by Popla

science
why did a portion of the table top get cold when Natasha placed her cold drink on the table
Thursday, February 18, 2016 by kyle

science
a banana turning brown when exposed to the air is an example of what
Thursday, February 18, 2016 by kyle

science
an ice cube, a glass of cold water, and a swimming pool are each exposed to the same amount of sunlight on a hot day. after five minutes, the ice cube is melted and the cold drink is two degrees warmer, but the temperature of the swimming pool remains unchanged. what is the ...
Thursday, February 18, 2016 by kyle

science
a blank property of matter describes an ability to change into different substances
Thursday, February 18, 2016 by kyle

science
a bananan turning brown when exposed to the air is an example of
Thursday, February 18, 2016 by kyle

science
an ice cube a glass of cold water in a
Thursday, February 18, 2016 by kyle

science
a 54-gram sample of an unknown material has a volume equal to 20cm3 what is the identity of the substance
Thursday, February 18, 2016 by kyle

science
write aprogram and flowchart to read anumber from 1-12 and print the name of the month
Thursday, February 18, 2016 by write aprogram and flowchart to read anumber from 1-12 and print the name of the month

Science
Can someone please check my answers? I would greatly appreciate it. Thanks! 1. Which of the following inner planets has virtually no atmosphere? a. Mercury*** b. Venus c. Mars d. Earth 2. Which of the following statements about the inner planets is true? a. They all have rings...
Thursday, February 18, 2016 by Blair

Computer Science
Create a Raptor Flowchart that calculates the amount a person would earn over a period of time if his or her salary were five cents the first day, ten cents the second day, and so on doubling each day. Your program should: 1. Request the number of days. 2. Display a table ...
Thursday, February 18, 2016 by Allison

science
If a ball that is freely falling has attained a velocity of 19.6 m/s after two seconds, what is its velocity five seconds later?
Thursday, February 18, 2016 by Anonymous

maths and science
A farmer sells eggs in trays.Each tray contains 30 eggs.a shopkeeper sells these eggs in dozens.If a shopkeeper needs 8 dozens a week,how many trays of eggs should he buy from the farmer?
Thursday, February 18, 2016 by mosese

physical science
a head ball of mass 600g is thrown vertically upwards from ground level and reaches the maximum height of 20metres.calculate the initial velocity of the ball
Thursday, February 18, 2016 by vinny

science
What volume of H2 gas, in mL, would be occupied by 0.00465 moles of H2 gas at a temperature of 0 °C and a pressure of 760 mmHg?
Thursday, February 18, 2016 by honest

MATHS LIT,GEO.HISTRY, LIFE SCIENCE
I DO NOT KNOW WHAT TO CHOOSE IN MY CAREER ?AS I DO THESE SUBJECTS CAN SOMEONE HELP ME WITH MY CAREER!
Thursday, February 18, 2016 by ZINTLE MBALISWANA

science
A feather is dropped on the moon from a height of 1.40meters.The acceleration of gravity on the moon is 1.67m/s^2.Determine the time for the feather to fall to the surface of the moon.
Thursday, February 18, 2016 by chris

science
47.25 L sample of nitrogen is determinedto contain 0.75 mole of nitrogen moles of provided presure remain the same?
Thursday, February 18, 2016 by nympha

science
47.25 L sample of nitrogen is determinedto contain 0.75 mole of nitrogen moles of provided presure remain the same?
Thursday, February 18, 2016 by Anonymous

science
Hcl is titrated against 5ml of sodium carbonate of strength 0.0133 then what should be the mean value of HCl added ?
Thursday, February 18, 2016 by Anonymous

Science
What might be the functions of the chemical additives in body washes?
Wednesday, February 17, 2016 by Timmy

science, chemistry
Calculate the final Volume of solution obtained if 100.0 mL of 12.0 M NaOH is diluted to 5.20M
Wednesday, February 17, 2016 by Amy

Science Please Help!!!
Which best describes a cave ecosystem? A) Plentiful food, widely varying temperature B) Plentiful food, constant temperature C) Very little food, widely varying temperature D) Very little food, constant temperature I think it's either C or D....maybe C??? Please help! (=
Wednesday, February 17, 2016 by Sammy

Earth science
A scientist wants to determine the age of a rock. The rock contains an index fossil and an ancient relative of a living organism. Which is more useful for dating the rock, and why? Answer: an ancient relative of a living organism would be more useful for dating the rock ...
Wednesday, February 17, 2016 by Sue

Science
2.)which of the following statements about the solar system's formation is true? a:the temperature was very cold. b:gravity pulled together a cloud of gas and dust. c:objects formed from the same materials. d:the planets formed at the same distance from the sun. B?
Wednesday, February 17, 2016 by #FreeGucci

Enriched science
What is the goal of synthetic biology? A. The goal of synthetic biology is to mimic living cells B. The goal of Synthetic biology is to generate new tissues to replace damage tissues C. The goal of synthetic biology is to engineer living cells to perform specific functions D. ...
Wednesday, February 17, 2016 by Rhyleigh

Enriched science
Engineers who are working to find alternative fuel sources hope to A. Reduce air pollution B. Use more fossil fuels C. Design microorganisms that will eat oil D. Increase the yeild of food crops
Wednesday, February 17, 2016 by Rhyleigh

Enriched science
Which of the following would be an engineering project that could help protect the planet? A. Finding a new landfill site B. Designing a better trash compactor C. Deciding which products can be recycled D. Growing microbes that eat oil
Wednesday, February 17, 2016 by Rhyleigh

Science
RNA is thought to have proceeded proteins and DNA, why? A. more types of RNA than DNA B. single stranded RNA is less complex than DNA Not sure if either are correct?
Wednesday, February 17, 2016 by sharon

Science
Sustained increase in the population that makes up all the trophic levels requires an increase in A. primary producers B. primary herbivores C. primary carnivores D. keystone predators
Wednesday, February 17, 2016 by sharon

Science
DNA can copy itself easier than RNA because? A. its a double helix B. polymer of nucleotide C. its confined to nucleus D.its supported by histone proteins I have no idea
Wednesday, February 17, 2016 by sharon

Science
chlorine atoms have larger radii than fluorine A. True B. false I am unsure
Wednesday, February 17, 2016 by sharon

Science
Genetic Information is found where? A. nuclei B. ribosome I think A
Wednesday, February 17, 2016 by sharon

Science
key factor driving cellular differentiation in the body? A. rate of transcription B. cell nutrience C. expression of genetic coding D. chemical gradients in a cell environment I think A
Wednesday, February 17, 2016 by sharon

Science
Pepsin is... A. enzyme B. lipid C. carbohydrate D. nucleic acid I think A!
Wednesday, February 17, 2016 by sharon

Science
What cell stimulates immune cells to attack? A. Helper T cells B. Cytotoxic T cells
Wednesday, February 17, 2016 by sharon

Science
Bond that holds atoms together in a molecule are? A. radiation energy B. kinetic energy C. thermal energy D. potential energy I think B
Wednesday, February 17, 2016 by sharon

Science
Lifelong protection after exposure such as the chicken pox is which type of immunity A. Active immunity B. innate immunity I think B
Wednesday, February 17, 2016 by sharon

Science
function of smooth ER A. synthesis lipids B. form ribosomes C generate energy D phagocytose bacteria I think A
Wednesday, February 17, 2016 by sharon

Science
Which example is an example of natural selection A.prairie dogs build an underground tunnel B. fish omit odor to avoid sea lions C. cats with better nutrition play more D. lizards absorb vitamin D to help digest food. I think B
Wednesday, February 17, 2016 by sharon

Science Physics
A rope exerts a 274N force on an 80kg skier up along a hill inclined 12 degrees. A frictional force of 100N opposed the motion. If the skier starts from rest, what is her speed after travelling 100m?
Wednesday, February 17, 2016 by Yoda

SCIENCE
Indicate how to mix two of the first concentration 3.2 M hydrochloric acid solution and the second to 15% by weight and density 1.30Kg / L to obtain 2.5 L of hydrochloric acid solution in 4.2M concentration
Wednesday, February 17, 2016 by ATTILIA

SCIENCE
A nitric acid solution at 25% by weight has a density of 1.21 KG / L Calculate the volume needed to be taken to obtain 2 L of a 2.5 M solution of nitric acid
Wednesday, February 17, 2016 by ATTILIA

science
A chain link m/c having a blade of (330x52x6)mm on which steel wire is rotated of 4mm how much torque is reqd for amotor.
Wednesday, February 17, 2016 by atharva d gawande

science
construct a heating curve for a substance that is heated to 150 deg centigrade. The substance is originally solid at 35 deg c, melts at 75 deg c and boils at 126 dec c
Wednesday, February 17, 2016 by vidya

English
how do I explain how a monster might be used as a metaphor for science or scientific advances, and how could such a metaphor be considered social commentary about science?
Tuesday, February 16, 2016 by Alie

Science
The diagram below shows the structural formula and 3D model of the same substance. Which substance is represented by the diagram above? A. H2O ? B. OH C. H2O2 D. OH2 PLZ HELP ASAP @miss sue
Tuesday, February 16, 2016 by Anonymous

Science
*NEED HELP ASAP* TIA Hi everyone! If you could help me I would really like that! Question: Suppose the moon rotated on its axis just as quickly as Earth. Would you still always see the same side of the moon from Earth?
Tuesday, February 16, 2016 by May

SCIENCE
1.1 how far does it fall in 5s? 1.2 what is its speed after 4s? 1.3 Determine its speed after falling 125m? 1.4 what is its speed after 2,7 s? 1.5 How far does it fall in 3,8 s? 1.6 How long does it take to fall 54 m? 1.7 Determine its speed after it falls 63 m?
Tuesday, February 16, 2016 by SOLLY KGOMOTSO MAJADIBODU

math literacy,business studies ,life science and c
What are the possible careers if you do these subjects?
Tuesday, February 16, 2016 by katleho

maths literacy, business studies, life science, consumer studies
Am in grade 11, Which career choices could i consider when applying for universities?
Tuesday, February 16, 2016 by hlengiwe

Science
The movement of air and water through a soil is influenced most by the soil’s ______
Tuesday, February 16, 2016 by Bruce

maths, science,geography,life science
Calculate the tension T2 in string?
Tuesday, February 16, 2016 by nomfundo

Science
Which of the following is true about all of the outer planets. A: Much of the material in these planets is solid. B: The surface of these planets is rocky. C: They have many moons. D: They all rotate in the same direction. Plz help me with this question, I think its C, what do...
Tuesday, February 16, 2016 by USer(I Hate Math)

science
find the angle of elevation of a gun that fires a shell with a muzzle velocity of 120m/s and hits a target on the same level but 1300m distant.
Tuesday, February 16, 2016 by lucas

science
in which biome would you find the main types of plant life to be grasses and nonwoody plants A.Desert B.Savanna C.Tundra D.Mountains my answers B
Tuesday, February 16, 2016 by Mia

Science
1.)Which of the following terms refers to an object that orbits the sun and has enough gravity to be spherical but has not cleared the area of its orbit? (1 point) A.)comet B.)asteroid C.)dwarf planet D.)planet
Tuesday, February 16, 2016 by #FreeGucci

Science
Which of the following land regions should show the greatest similarities in fossil types?
Tuesday, February 16, 2016 by Blake

science
Why are the shells in which electrons revolve called energy levels
Tuesday, February 16, 2016 by khushi

science
a place kicker kicks a football with a velocity of 20.0 minutes per hour and at an angle at 53 degrees a.how long is the ball in the air b.how far away does it land c.how high does it travel
Tuesday, February 16, 2016 by jared queliza

Science
I'm really bad at Biology and Science in general. Chemistry and Physics will be difficult for me because I'm not good at the Science branch even though I study and work hard for Science/Biology. What can I do to improve?
Monday, February 15, 2016 by Anonymous

science
If there is a fish bowl with a fish in it 2 turtles and some seaweed in it, would that be a ecosystem or a community. (there is also some sand in there(abiotic)).
Monday, February 15, 2016 by Yvr int'l airport

Science
Two blocks of mass M kg and 2,5 kg respectively are connected by a light,inextensible string.The string runs over a light,frictionless pulley
Monday, February 15, 2016 by Siyabonga

Building science&propaties of materials
With the aid of a diagram explain the change in frequency with respect to changes in mass,leinght tension on a sonometer bridge
Monday, February 15, 2016 by Hamza umar

Science
When are tides in earth's oceans the highest? A. during the moon's waning gibbous phase. B. during the moon's waxing gibbous phase C. when the moon is at a right angle to the sun*** D. when the sun, Earth, and moon are in line
Monday, February 15, 2016 by Angel

Physical science
How much more does someone with a bachlors degree usually earn than someone with a high school deploma?
Monday, February 15, 2016 by Lina

Physical science
What are some of the reasons for income differences?
Monday, February 15, 2016 by Lina

Earth Science
If we were to increase atmospheric CO2 fivefold by the burning of fossil fuels, how much would the atmospheric oxygen concentration change relative to what it is today? Assume: (a) CO2 concentration today is 400 ppm, (b) the atmosphere today is made of 21% oxygen, and (c) the ...
Monday, February 15, 2016 by Marisa

science
A bullet of 29g is shot from a gun of mass 20kg with a muzzle velocity of 200ms if the bullet is 30cm long.determine. a)acceleration of the bullet b)the recoil velocity of the gun
Monday, February 15, 2016 by brian

Science 8
Gravity pulled three toy cars of different cases down an inclined ramp, 0.3 kg, 0.9 kg, and 1.8 kg. What is the ratio of the masses of the toy cars?
Monday, February 15, 2016 by cortez

science
solution contains 0.50M Nh3 and 1.50 M Nh4cl. What is the maximum concentration of mg2+ that can be present in such a solution without precipitating Mg(oh)2?
Monday, February 15, 2016 by dffddx

Science
How many traits are involved in a monohybrid cross? How many alleles are involved? What prevents the expression of a recessive allele? When gametes form, what happens to the alleles for each trait?
Monday, February 15, 2016 by Teresa

science
1.scientists who capture fish from depths of 1000m or more for study have to bring them to the surface in pressurized containers. why do they do this? 2.a car of mass 600 kg has four tyres each of surface area 0.005m^2. determine the pressure exerted by each tyre on the ground...
Monday, February 15, 2016 by sim

science
1.scientists who capture fish from depths of 1000m or more for study have to bring them to the surface in pressurized containers. why do they do this? 2.a car of mass 600 kg has four tyres each of surface area 0.005m^2. determine the pressure exerted by each tyre on the ground...
Monday, February 15, 2016 by sim

Science
Two Tugboats pull a disabled supertanker. Each tugboat exerts a constant force 1.8x10^6 N, one at 10° west of North and other at 10° east of north, as they pull the tanker 0.50km towards north. The mass of the tanker is 2.20x10^8 kg. What is the total work the tugboats...
Monday, February 15, 2016 by Majid

Physical science
What is the force of gravity between two 1215 kg cars separated by a distance of 31m on an interstate highway
Sunday, February 14, 2016 by Anonymous

science
Two knights on horseback start from rest 88.0 m apart and ride directly toward each other to do battle. Sir George's acceleration has a magnitude of .300 m/s^2, while Sir Alfred's has a magnitude of .200 m/s^2. Relative to sir Ggeorge's starting point, where do the...
Sunday, February 14, 2016 by a

science
A box is pulled across the floor a at constant speed it is pulled horizontal force of 48 N
Sunday, February 14, 2016 by otis

Math
A science class has 3 girls and 3 boys in the seventh grade and 4 girls and 1 boy in the eighth grade. The teacher randomly selects a seventh grader and an eighth grader from the class for a competition. What is the probability that the students she selects are both boys?
Sunday, February 14, 2016 by Brooke

Science
Two tugboat A and B tow alarge boat in an easterly direction the cable which are connected to A and B respectectively make angles of 45 degrees north of east and 30 degrees south of east to the direction of motion (question it the tension fa is equal to 10000N calculate the ...
Sunday, February 14, 2016 by Sanele

science
it is possible for two obje to have the same dimensin but different units
Sunday, February 14, 2016 by khensytomboy

science
A light inelastic string connects two objects of mass 6kg and 3kg respectively. They are pulled up an inclined plane that makes an angle of 30 degrees with the horizontal,with a force of magnitude F. Ignore the mass of the string. Calculate the tension in the string if the ...
Sunday, February 14, 2016 by zama

science
Determine graphically the equilibrant of two forces of 15N and 20N if the angle between them is 135degrees
Sunday, February 14, 2016 by Homework

science
What do you mean by law of conservation of energy. Use this law to find speed of an object just before hitting the ground if it is allowed to fall through a height of 19.6m.
Sunday, February 14, 2016 by peehu goyal

science
the radius of planet x is twice that of the earth and its mass is also twice that of the earth. The gravitational acceleration on planet x would be approximatley?
Sunday, February 14, 2016 by thabo

Science
Why are weather balloon soundings done at the same time around the world?
Sunday, February 14, 2016 by Anonymous

Science Please Help!!!
A woman with a genetic disease marries a man who does not carry the disease. It is not possible for their children to carry the disease. The disease must be a) sex - linked b) recessive c) dominant d) cause by an extra chromosome I think the answer is recessive, can someone ...
Saturday, February 13, 2016 by Sammy

science chemistry
A ground state hydrogen atom absorbs a photon of light having a wavelength of 93.03 nm. It then gives off a photon having a wavelength of 396.9 nm. What is the final state of the hydrogen atom? Values for physical constants can be found here.
Saturday, February 13, 2016 by Anisha

Geography ,life science
Plz help me I dont understand the charpter of cells in life science
Saturday, February 13, 2016 by Mankosi

Science
Locate the centre of mass of a system of two spherical masses of 5kg and 10kg kept with their centres 1m apart
Saturday, February 13, 2016 by Falguni

Physical Science
4. What measurable property/properties affects the period of a pendulum? 7.Give another example of periodic motion other than simple harmonic motion. 8. If you landed on the moon, could you use the pendulum method to find "g" there? Explain.
Friday, February 12, 2016 by Sherianna

science
aranging these compounds deceding caco3 caso4 Nacl Mgcl
Friday, February 12, 2016 by disura

science
Which of the following determines the carrying capacity of a particular population by an ecosystem? 1. keystone species 2. pioneer species 3. limiting factors**** 4. renewable resources.
Friday, February 12, 2016 by little dark one

science
2. A salamander is a keystone species in a forest ecosystem with high biodiversity. This species migrates from woodland areas to a local stream to reproduce. If a road is built that cuts off the woodland areas from the stream, what effect will this have on the forest ecosystem...
Friday, February 12, 2016 by little dark one

science
Just checking my answers.. 1. Which is not a characteristic of the Group 1 alkali metals? A. high densities B. low melting points*** C. found in batteries D. silvery solid 2. Which of the following is true of the Group 2 alkali earth metals? A. They are less dense than the ...
Friday, February 12, 2016 by Anon.

science
A force of 200N is resolve in two forces if one component is equal to 120N and makes an angle of 30¡ã with 200N force find the other force
Friday, February 12, 2016 by Abhinav

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