Tuesday
October 21, 2014

Homework Help: Science

Branches of Science

Recent Science Questions

Post a New Question | Current Questions

Science
Science project ideas for science fair. I need to prepare a model for science fair. But I need some ideas about the major problems facing today's world. So that I can get idea for improvement in any area and to show this in science fair. Please get me know about the ...
Tuesday, October 21, 2014 at 4:20am

Science
1. How might sexual reproduction decrease an organism’s chance of survival? A)If the offspring inherits a genetic combination that includes a harmful trait, it could decrease the organism’s chance of survival. ***** B)If the offspring inherits the exact same genetic ...
Tuesday, October 21, 2014 at 3:54am

science
1) a pea plant with yellow seeds is crossed with a pea plant with green seeds. all of the offsprings have yellow seeds. the allele for yellow sees is a. Dominate because all offspring have yellow seeds. b. Recessive because all of the offsprings have yellow seeds. c. dominant ...
Tuesday, October 21, 2014 at 12:19am

Science Help
It’s the night of the BIG homecoming dance and you just can’t wait. You think you have everything planned perfectly! On your way to the dance though there is some slow driving JERK in front of you so you slam on the gas going from 30. mi/hr to 60. mi/hr. Luckily your...
Monday, October 20, 2014 at 10:19pm

Science
1.) Robin hood shoots an arrow up in the night sky. What is the acceleration at the very top of its path? 2.) Juan's car has an acceleration = -2.76m/s^2 and a velocity = 43m/s. Is he slowing down or speeding up?
Monday, October 20, 2014 at 9:03pm

science-chemistry
An aqueous solution of ammonium nitrite decomposes when heated to give off nitogen gas and water. This reaction can be used to prepare pure nitrogen gas. How many grams of ammonium nitrite must have reacted if 3.75 liters of nitrogen gas was colleced over water at 25˚C ...
Monday, October 20, 2014 at 5:38pm

science
what does nuclear energy mean and can you give me a example of what it is?
Monday, October 20, 2014 at 5:30pm

Physical Science
A long distance swimmer, who is very cold, m=100 kg., 1000 kilocalories are supplied to warm them up. The specific heat for a human is 0.83. A) What will be the temperature change? B) If the original temperature is 85 degrees, find the final temperature.
Monday, October 20, 2014 at 5:01pm

Physical Science
A piece of aluminum, mass 40 kg. C= 0.2 kilocalories/kg.(degrees), change in temperature =20degrees, find Q, in kilocalories.
Monday, October 20, 2014 at 4:51pm

science
why is all Florida at risk for damage from hurricane winds?
Monday, October 20, 2014 at 4:50pm

Physical Science
The sand on the beach heats up faster each day than the water does. You know this because when you walk on the beach in the early morning, your feet are cool. By noon, the beach is so hot, you cannot walk on it in bare feet . The ocean, however stays cool. Which one has the ...
Monday, October 20, 2014 at 4:48pm

PS.225 SCIENCE
NARRATIVE DNA
Monday, October 20, 2014 at 4:25pm

Science
Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. 61,103 = _____ 6.11 x 104 6.1103 x 104 6 x 104
Monday, October 20, 2014 at 10:46am

Science
The number 7.325 rounded off to three significant figures is 7.32 7.30 7.33
Monday, October 20, 2014 at 10:44am

PLZ HELP.( INT. SCIENCE)
Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. 0.01325 = _____ 1.325 x 10-2 1.0 x 10-2 1.3 x 10-2
Monday, October 20, 2014 at 10:33am

science
1. radioactive decay occurs when atoms A- lose mass B- join with atoms of another element C- break down to form atoms of another element D- are exposed to chemical weathering 2. if you want to consult the geologic time scale for when the first vertebrates evolved, where would ...
Monday, October 20, 2014 at 9:59am

int.science
Express in scientific notation. Make sure your answer has the same number of significant figures as the starting value. (1.8 x 10-2) ÷ (9 x 102) = _____ 2 x 10-5 2.0 x 10-5 0.2 x 10-4
Monday, October 20, 2014 at 9:29am

science
How to do an outline investigation plan?
Monday, October 20, 2014 at 3:07am

science
You are running from a zombie with a velocity of 2.5 m / s. If you run for 1500 meters and have a mass of 61.4 kg, how much work have you done?
Sunday, October 19, 2014 at 9:51pm

Math/Science
Three bullets are fired simultaneously by three guns aimed toward the center of a circle where the bullets mash into a stationary lump. The angle between the guns is 120°. Two of the bullets have a mass of 9.30 10-3 kg and are fired with a speed of 440 m/s. The third ...
Sunday, October 19, 2014 at 8:40pm

Physics
In a science fiction novel two enemies, Bonzo and Ender, are fighting in outer spce. From stationary positions, they push against each other. Bonzo flies off with a velocity of +2.2 m/s, while Ender recoils with a velocity of -2.9 m/s. Determine the ratio mBonzo/mEnder of the ...
Sunday, October 19, 2014 at 5:18pm

science
1. radioactive decay occurs when atoms A- lose mass B- join with atoms of another element C- break down to form atoms of another element D- are exposed to chemical weathering 2. if you want to consult the geologic time scale for when the first vertebrates evolved, where would ...
Sunday, October 19, 2014 at 1:23pm

science
What is the visual reaction when CuSO4 and NaCO3 is combined? I know what to do, I just forgot the info at school and I need this done by tomorrow. I would prefer to figure it out on my own but I don't have the chemicals at my house and I can't find anything online to ...
Sunday, October 19, 2014 at 11:22am

science
I did the work for this lab but forgot to record the data. It was a double displacement of CuSO4 and NaCO3. If someone could help me with the visual reaction that would help me out a lot. I know what to do I just don't remember what happens.
Sunday, October 19, 2014 at 11:12am

science
what force is applied by Andre if he does 250 J of work as he pushes a box 19 M along the ground ?
Sunday, October 19, 2014 at 10:38am

Science Help
1.) A rail gun uses electromagnetic energy to accelerate objects quickly over a short distance. In an experiment, a 2.00 kg projectile remains on the rails of the gun for only 2.10x10-2 s, but in that time it goes from rest to a velocity of 4.00×103 m/s. What is the ...
Saturday, October 18, 2014 at 5:29pm

Computer Science
Write a program to compute an employee’s weekly pay and produce a pay slip showing name, gross pay (i.e. pay before deductions), deductions, and net pay (i.e., pay after deductions).
Saturday, October 18, 2014 at 2:21pm

science
all alkalies are bases but all bases are not alkalies
Saturday, October 18, 2014 at 5:30am

Materials Science
A hollow cylinder with outer radius r0 and inner radius ri is loaded by a uniformly distributed load q across its length L. The beam is supported by a roller at its left end and a pin L5 from its right end. What is the maximum bending moment in the beam? Express your answer in...
Friday, October 17, 2014 at 10:36pm

Materials Science
A 4-point bending test is performed on the same beam, with symmetric loads of 5kN separated by 2m. Draw the bending moment and shear force diagrams for the beam. Then answer the following questions about the shear force V and bending moment M. What is the shear force in the ...
Friday, October 17, 2014 at 10:32pm

Materials Science
A 3-point bending test is performed on a simply supported beam of length L=4m and of rectangular cross-section, with width b and height h. For a central load of 10kN, draw the bending moment and shear force diagrams for the beam. Then answer the following questions about the ...
Friday, October 17, 2014 at 10:30pm

science
The muscular system is essential because it allows our bones to A. Strength B. Contract C. Lengthen D. Move Is the answer is D? Thanks.
Friday, October 17, 2014 at 7:41pm

Science
Which of the following best explains why it is necessary for the body to eliminate waste?
Friday, October 17, 2014 at 4:51pm

Science
What conclusion can be drawn about the relationship between the arrangement of elements on the periodic table and the patterns observed in their priorities? A. Properties of elements are related to atomic numbers. B. Properties of elements are related to ductility. C. ...
Friday, October 17, 2014 at 4:10pm

science
how fast is mach 1 ?
Friday, October 17, 2014 at 11:56am

Science PLEASE HELP!
Why is Lithium more reactive than Neon? I honestly do not understand this.
Friday, October 17, 2014 at 11:38am

science
Would somebody be so kind and help me with my homework,please?Explain, how a substance will dissolve differently if the temperature changes. Thank you for help.
Friday, October 17, 2014 at 10:06am

science
an elephant of mass 500kg stands with all four feet on the ground. each foot has an area of 0.08m^2.calculate the pressure exerted on the ground.[g=10m/s^2]
Friday, October 17, 2014 at 6:50am

science
can you tell me the relationship between water treatment and geckos
Friday, October 17, 2014 at 12:28am

Science
Two football players collide head-on in midair while chasing a pass. The first player has a 100 kg mass and an initial velocity of 4.00 m/s in the positive x direction, while the second player has a 130 kg mass and initial velocity of 3.30 m/s in the negative x direction. What...
Thursday, October 16, 2014 at 11:12pm

science
what are 3 examples for sodium
Thursday, October 16, 2014 at 10:34pm

Science Help Urgent!!!!!
A particular neutral uranium atom has 92 protons, 143 neutrons, and an atomic mass of 235. How many electons does the atom have? a. 92 b. 143 c. 235 d. 337 Is the answer A?
Thursday, October 16, 2014 at 9:08pm

science help
A praticular neutral uranium atom has 92 protons,143 neutrons, and an atomic mass of 235. How many electrons does the atom have? A. 92 B. 143 C. 235 D. 337 Is the answer D? Thanks
Thursday, October 16, 2014 at 8:56pm

science help
What would happen to the current model of the atom if new information about its structure is discovered in the future? A. The current atomic model would be revised. B. The current atomic model would be strengthened. C. The current atomic model would be proven. D. The current ...
Thursday, October 16, 2014 at 8:47pm

Materials Science
Calculate the ratio of the moments of inertia I1I2 of two beams of rectangular cross section of the same width, one with a height h and the other, made up of three thinner beams of height h/3. I1/I2 = ?
Thursday, October 16, 2014 at 7:31pm

Materials Science
A 3m long balance beam is simply supported with an overhang at each end of a=0.5m. A gymnast weighing 50kg is standing a distance c to the right of support A and a distance b to the left of support B. How does the maximum bending moment in the beam depend on the distance c? ...
Thursday, October 16, 2014 at 7:29pm

Science-Physics
A fireworks rocket explodes at height h, the peak of its vertical trajectory. It throws out burning fragments in all directions, but all at the same speed v. Pellets of solidified metal fall to the ground without air resistance. Find the smallest angle that the final velocity ...
Thursday, October 16, 2014 at 7:29pm

Science
Explain the forms of energy: radiant, chemical,mechanical,electrical, and thermal
Thursday, October 16, 2014 at 7:24pm

Science
What is energy. Give short definition and give an example
Thursday, October 16, 2014 at 6:56pm

science help
Chromosone pairs contain diffrent versions of genes, which are called? A.alleles B.chromosome C.mitosis D.DNA E.RNA F.diploid G.meiosis H.phenotype Is the answer A??
Thursday, October 16, 2014 at 6:28pm

Science
.Define the following terms and provide a example of each: -atom, - compound, - element, -energy, - photosynthesis, -matter, - decomposition. Write it in your own words. . Explain the forms of energy: radiant, chemical, mechanical, electrical, thermal. . What is a food chain...
Thursday, October 16, 2014 at 5:47pm

science
If the following graph represents the decay of strontium-90 in an igneous rock, what event occurred at 0 years on the horizontal axis? Graph: the vertical axis is showing the percentage of radioactive element remaining. The values on the vertical axis are 0 (origin), 25, 50, ...
Thursday, October 16, 2014 at 4:10pm

Science
Would somebody be so kind and help me with my homework,please?Explain, how a substance will dissolve differently if the temperature changes. Thank you for help.Kinga
Thursday, October 16, 2014 at 3:23pm

Science
Explain, how a substance will dissolve differently if the temperature changes. Thank you for help.Kinga
Thursday, October 16, 2014 at 1:19pm

Science-Physics
A car is moving at a constant 19.3m/s, and rain is falling at 8.9 m/s straight down. What angle does the rain make with respect to the horizontally observed by the driver?
Thursday, October 16, 2014 at 11:59am

Science (Physics)
I need help with these. I'm so confused! Thanks! 1.) An F-14 Tomcat fighter jet goes from rest to a speed of 75m/s in 2.5 s. What is the acceleration? 2.) Preston tossed a red ball upward and it reaches a maximum height of 3.0m What is the final velocity when it returns to...
Thursday, October 16, 2014 at 11:56am

Science
What two angles of elevation will enable a projectile to reach a target 16 km downrange on the same level as the gun if the projectile's initial speed is 400m/sec ?
Thursday, October 16, 2014 at 9:46am

science
Two spheres A and B of mass 6.0 kg and 7.3 kg respectively are separated by a distance of 0.65 m. (a) Calculate the magnitude of the gravitational force A exerts on B and B exerts on A.
Wednesday, October 15, 2014 at 8:56pm

Science
If 2 cities on a globe is equal to 7cm, what is the actual distance between the 2 cities?
Wednesday, October 15, 2014 at 8:47pm

Science HELP
A cow that is heterzygous for the black coat allele is crossed with a bull that is homozygous for the red coat allele. Which of the following Punnett squares represents this cross? A. B B b Bb Bb b Bb Bb Thats one punnett square B. B b B BB Bb b Bb bb Thats one punnett square ...
Wednesday, October 15, 2014 at 8:23pm

Science
A cow that is heterzygous for the black coat allele is crossed with a bull that is homozygous for the red coat allele. Which of the following Punnett squares represents this cross? A. B B b Bb Bb b Bb Bb Thats one punnett square B. B b B BB Bb b Bb bb Thats one punnett square ...
Wednesday, October 15, 2014 at 8:02pm

Science
A cow that is heterzygous for the black coat allele is crossed with a bull that is homozygous for the red coat allele. Which of the following Punnett squares represents this cross? A. B B b Bb Bb b Bb Bb Thats one punnett square B. B b B BB Bb b Bb bb Thats one punnett square ...
Wednesday, October 15, 2014 at 7:38pm

Science
The process in which the chromosomes in sex cells are reduced by half is called Answer choicesalleles, chromosome, incomplete dominance, mitosis, codominance, centromere, DNA, diploid, reproduce, phenotype, meiosis, RNA Is the asnwer mitosis?
Wednesday, October 15, 2014 at 6:42pm

Science
In a praticular breed of cattle, a black coat is dominant over a red coat. If a cow with a red coat is crossed with a black bull that is heterozygous for coat color, what percentage of their offspring would you expect to be black? A. 25% B. 50% C. 75% D. 100% Is the answer B? ...
Wednesday, October 15, 2014 at 6:34pm

Science
A white mouse is crossed with a black mouse. All of the offspring were grey, The genes for fur color in mice show. Answer choices alleles, chromosome, incomplete dominance, mitosis, codominance, centromere, DNA, diploid, reproduce, phenotype, meiosis, RNA Is the answer ...
Wednesday, October 15, 2014 at 6:30pm

Science
Genes are specific sections of (Fill in the blank) Answer choices alleles, chromosome, incomplete dominance, mitosis, codominance, centromere, DNA, diploid, reproduce, phenotype, meiosis, RNA Is the answer chromosome, or DNA?
Wednesday, October 15, 2014 at 6:22pm

Science
A boat has a speed of 15ms-1 in still water. It is used to cross a river 500m wide along which there is a strong current of 0.9ms-1. The boat is being directed to the opposite bank, but is carried downstream. Calculate: a) The boat velocity relative to the bank b) The distance...
Wednesday, October 15, 2014 at 6:17pm

Science
Genes are specific sections of (Fill in the blank) Answer choices alleles, chromosome, incomplete dominance, mitosis, codominance, centromere, DNA, diploid, reproduce, phenotype, meiosis, RNA Is the answer chromosome, or DN?
Wednesday, October 15, 2014 at 5:56pm

Science
To pass its traits on to the next generation, an organism must (Fill in blank) Answer choices alleles, chromosome, incomplete dominance, mitosis, codominance, centromere, DNA, diploid, reproduce, phenotype, meiosis, RNA Is the answer reproduce?
Wednesday, October 15, 2014 at 5:54pm

Science
In a praticular breed of cattle, a black coat is dominant over a red coat. If a cow with a red coat is crossed with a black bull that is heterozygous for coat color, what percentage of their offspring would you expect to be black? A. 25% B. 50% C. 75% D. 100% Is the answer C? ...
Wednesday, October 15, 2014 at 5:40pm

Science
Chromosome pairs contain different versions of genes, which are called (fill in) My answer DNA Is that the correct answer?
Wednesday, October 15, 2014 at 5:38pm

Science
In order for a child to inherit a recessive genetic disease, like sickle cell anemia, healthy parents must both A. have the disease B. be homozygous for the mutated gene that causes the disease. C. be carries of the mutated gene that causes the disease D. have another ...
Wednesday, October 15, 2014 at 5:25pm

Science
A scientist is studying a plant species in which the flower color genes are codominant. The scientist crosses a plant with red flowers and a plant with white flowers. The offspring will most likely have A. red flowers B. white flowers C. pink flowers D. red flowers with white ...
Wednesday, October 15, 2014 at 5:07pm

Science
In humans, having dimples is a dominant trat. In order for a child to have dimples A. at least one parent must not have dimples and pass on the recessive allele. B. both parents must not have dimples and pass on the recessive allele. C. both parents must have dimples and pass ...
Wednesday, October 15, 2014 at 5:01pm

Science
What is a muation? A. A mutation is a permanant change in the order of bases in the DNA. B. A mutation is a temporary change in the order of bases in the DNA. C. A mutation is a permanant change in the way a cell carries out mitosis. D. A mutation is a temporary change in the ...
Wednesday, October 15, 2014 at 4:52pm

Science
In a praticular breed of cattle, a black coat is dominant over a red coat. If a cow with a red coat is crossed with a black bull that is heterozygous for coat color, what percentage of their offspring would you expect to be black? A. 25% B. 50% C. 75% D. 100% Is the answer C? ...
Wednesday, October 15, 2014 at 4:24pm

Science
A dog is trained to sit and shake hands. These traits are most likely A. Inherited B. Not inheited C. Not aquried D. Innate Is the answer B?
Wednesday, October 15, 2014 at 4:18pm

program planning
An appropriate science activity for a child six to 12 years of age is   A. using a compass to find a specific site.B. experimenting with a magnet.C. growing plants from seeds.D. collecting leaves.  My answer is D
Wednesday, October 15, 2014 at 2:29pm

program planning
An appropriate science activity for a child six to 12 years of age is  A. using a compass to find a specific site.B. experimenting with a magnet.C. growing plants from seeds.D. collecting leaves.  My answer is C
Wednesday, October 15, 2014 at 1:31pm

earht science
1. How did planetesmals form planets? (1 point) A. They broke apart into smaller chunks. B. They collided and stuck together.** C. They cooled and pulled ice together. D. They began to rotate. 2. Which parts of the sun’s atmosphere become visible during a total solar ...
Wednesday, October 15, 2014 at 11:53am

Physics/science
A stuntman drives a motorcycle off a 350 m cliff going 70 mph. The angle of elevation of the cliff is 21 degree. He is hoping to make it across a 261 m wide river and land on a ledge 82 m high. Does he make it? HELP ME PLSSSSSSS!!!!!
Wednesday, October 15, 2014 at 6:24am

Science
A stuntman drives a motorcycle off a 350 m cliff going 70 mph. The angle of elevation of the cliff is 21 degree. He is hoping to make it across a 261 m wide river and land on a ledge 82 m high. Does he make it?
Wednesday, October 15, 2014 at 6:23am

Science
Where will gravity pull you in the center of the earth?
Wednesday, October 15, 2014 at 2:29am

program planning
An appropriate science activity for a child six to 12 years of age is A. using a compass to find a specific site.B. experimenting with a magnet.C. growing plants from seeds.D. collecting leaves. My answer is C
Wednesday, October 15, 2014 at 12:33am

Science Please Check!
Which statement best explains how the structure of a starch molecule relates to its function? A- A branching structure makes the molecule stronger. B- A branching structure has more chemical bonds than an unbranched structure. C- A branching structure provides many points ...
Tuesday, October 14, 2014 at 9:59pm

Science
An object has a KE of 83.5 J, and a speed of 27.3 m/s. What is the object’s mass?
Tuesday, October 14, 2014 at 9:08pm

Science
What type of glassy rock is found in a volcano?
Tuesday, October 14, 2014 at 8:10pm

computer science
he edit distance is the minimum number of character insertions and character deletions required to turn one string into another. Compute the edit distance between each pair of the strings he, she, his, and hers.
Tuesday, October 14, 2014 at 7:10pm

World History Answer Check
1. What events led to German unification? A: The three wars planned by the Prussian prime minister, Otto von Bismarck, led to German unity. 2. How was Great Britian able to avoid a revolution in 1848? A: Great Britian was able to avoid a revolution by giving Parliament a vote ...
Tuesday, October 14, 2014 at 6:39pm

science
When 90 kJ is removed from a 2-kg copper bar, its temperature drops from 200°C to 85°C. The specific heat of copper is
Tuesday, October 14, 2014 at 6:15pm

Science
The boundaries between the Eurasian plate and the indo australian plate as well as the Nazca and the South American plate are convergent boundaries. What is a major difference in the geologic features and events at these two plate boundaries
Tuesday, October 14, 2014 at 6:08pm

Science
what will eventually became of the mediterranean sea in the future
Tuesday, October 14, 2014 at 6:05pm

Science Please Check!
Which atoms are in all carbohydrates? A- carbon, phosphorus, oxygen B- carbon, nitrogen, oxygen C- carbon, hydrogen, oxygen D- carbon, hydrogen, nitrogen My choice is C. Which type of macromolecule is the sugar fructose? A- protein B- lipid C- carbohydrate D- nucleic acid My ...
Tuesday, October 14, 2014 at 5:30pm

Science
what system/part of the body does the disorder affect?
Tuesday, October 14, 2014 at 5:06pm

Science
What is the name of the genetic disorder?
Tuesday, October 14, 2014 at 4:52pm

science/math
you have the same volume of two different liquids. what are two ways you can tell which has greater density? Answer: by comparing its Weight and mass
Tuesday, October 14, 2014 at 4:46pm

science
Describe briefly how you will determine the density of kerosene
Tuesday, October 14, 2014 at 4:28pm

Science
What is the name of the genetic disorder?
Tuesday, October 14, 2014 at 3:51pm

Physical Science- Math skills
Rachel is asked to calculate the density of a liquid. She correctly measures the mass of the liquid to be 14 grams, but she incorrectly measures the volume of the liquid to be 10 mL. The actual volume of the liquid is 9 mL. If Rachel uses the following equation to calculate ...
Tuesday, October 14, 2014 at 2:18pm

Physical Science
A box has a mass of 90 kg If the box is accelerating upward at 1.0m/s2, what is the tension of the cable?
Tuesday, October 14, 2014 at 1:38pm

Pages: 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | Next>>

Post a New Question | Current Questions

Search
Members