Sunday
April 19, 2015

Homework Help: Science

Branches of Science

Recent Science Questions

Science
An iodoalkane A, with a molecular mass of 198, contains 30.3% carbon and 5.6% hydrogen by mass. It reacts with aqueous sodium hydroxide solution to give an alcohol which can be oxidised and with ethanolic potassium hydroxide solution to give two alkenes, neither of which show ...
Sunday, April 19, 2015 at 1:09pm

computer science,python
Write a program called ‘vectormath.py’ to do basic vector calculations in 3 dimensions: addition, dot product and normalization.
Sunday, April 19, 2015 at 10:24am

comuter science, python
Write a program called ‘vectormath.py’ to do basic vector calculations in 3 dimensions: addition, dot product and normalization.
Sunday, April 19, 2015 at 8:57am

Science
Estimate the pressure that is exerted on the ground by an average female. In runners? and then In "high heels"?
Sunday, April 19, 2015 at 8:17am

Science
Calculate the heat required, in joules, to raise the temperature of a 0.20 kg block of aluminium from 20°C to 60°C.
Sunday, April 19, 2015 at 8:16am

science
A car,mass of 1500kg,accelerates at 2m/s from rest. Find 0-60mph time, use 1 mile=1613m
Sunday, April 19, 2015 at 7:08am

Physics for Physical science
A picture frame hung against a wall is suspended by two wires attached to its upper corners. If the two wires make the same angle with the vertical. (Draw a free body diagram)
Sunday, April 19, 2015 at 6:29am

Science
53.9 mL of 0.991 M nitric acid is added to 45.3 mL of sodium hydroxide, and the resulting solution is found to be acidic. 20.5 mL of 1.51 M potassium hydroxide is required to reach neutrality. What is the molarity of the original sodium hydroxide solution?
Saturday, April 18, 2015 at 4:19pm

science-chemistry
if 1g of carbon dioxide is bubbled into 100g of a calcium hydroxide solution in a flask. what is the total mass of substance in the flask after the reaction is complete?
Saturday, April 18, 2015 at 3:02pm

Science
Assuming all volume measurements are made at the same temperature and pressure, what volume of hydrogen gas is needed to react completely with 3.75 L of oxygen gas to produce water vapor?
Saturday, April 18, 2015 at 2:05pm

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromosphere*************** Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and...
Saturday, April 18, 2015 at 1:59pm

science
if 1g of carbon dioxide is bubbled into 100g of a calcium hydroxide solution in a flask. what is the total mass of substance in the flask after the reaction is complete?
Saturday, April 18, 2015 at 1:30pm

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromosphere*************** Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and...
Saturday, April 18, 2015 at 11:30am

science
A cart of weight 25 N is released at the top of an inclined plane of length 1m, which makes an angle of 30° with the ground. It rolls down the plane and hits another cart of weight 40 N at the bottom of the incline. Calculate the speed of the first cart at the bottom of ...
Saturday, April 18, 2015 at 11:03am

Science
1. Which layer of the sun's atmosphere are you looking at when you look at an image of the sun? Photosphere Chromosphere*************** Corona Prominence 2. Which of the following materials could have been found in the giant cloud that formed the solar system? Hydrogen and...
Friday, April 17, 2015 at 11:58pm

Science
"Earth's energy sources include both renewable and nonrenewable resources. Name at least three sources of energy that could be used in your house. Then describe the ideal source of energy for generating most of your home's electricity, and explain why you chose ...
Friday, April 17, 2015 at 6:38pm

Science
Every individual, including young people, can make decisions to use resources wisely. Use the terms reduce, reuse, and recycle to explain how the students in the image can help minimize solid waste. PLEASE HELP!!!!!!
Friday, April 17, 2015 at 6:09pm

Science
why is it important biodiversity? A. preservation of biodiversity prevents the extinction of species B. preservation of biodiversity increases the amount of fossil fuels formed in a shorter period of time. c. preservation of biodiversity disturbs the balance in ecosystems D. ...
Friday, April 17, 2015 at 5:02pm

Science
1. How did planetesmals form planets? They broke apart into smaller chunks They collided and stuck together They cooled and pulled ice together****** They began to rotate 2. What distance was used to define the astronomical unit (AU)? The average distance across the sun, its ...
Friday, April 17, 2015 at 4:40pm

Science
Neglecting air resistance, what is the speed of the object when it hits the ground?
Friday, April 17, 2015 at 3:30pm

Science
Multiple Choice 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 2.0 g of hydrogen with 16.0...
Friday, April 17, 2015 at 1:55pm

Science
1. How did planetesmals form planets? They broke apart into smaller chunks They collided and stuck together They cooled and pulled ice together They began to rotate 2. What distance was used to define the astronomical unit (AU)? The average distance across the sun, its ...
Friday, April 17, 2015 at 1:41pm

Science
which of the following would have the greatest force? •an object with low mass accelerating slowly •an object with low mass accelerating quickly •an object with high mass accelerating quickly •an object with high mass accelerating slowly (and yes i go to to...
Friday, April 17, 2015 at 12:47pm

Science
Im having trouble with reading a chemical equation. ( Numbers on the right side of the element are subscripts ) A) 2SO2 + O2 +2H2O -> 2H2SO4 1. How many total molecules are represented? ( I m having trouble recognizing when it s a molecule or just an element and which is ...
Thursday, April 16, 2015 at 11:40pm

Science
Im having trouble with reading a chemical equation. ( Numbers on the right side of the element are subscripts ) A) 2SO2 + O2 +2H2O -> 2H2SO4 1. How many total molecules are represented? ( I m having trouble recognizing when it s a molecule or just an element and which is ...
Thursday, April 16, 2015 at 11:38pm

science
A rectangular barge floats in freshwater. When a 400 kg block is loaded on the 5 m long by 2 m wide barge, the barge sinks a few centimeters deeper. How much deeper does the barge lower?
Thursday, April 16, 2015 at 11:23pm

Science
if a 1 kg mass is placed on top of the input piston what is the largest mass that the output piston
Thursday, April 16, 2015 at 10:49pm

Science
Use the following equation: CO(g) + 2H2 (g)= CH3OH(g) delta H = -21.7 kcal Which direction will the reaction proceed after some of the methanol vapor is condensed and removed from the reaction vessel? please help im getting so confused on the directions of the reactions
Thursday, April 16, 2015 at 9:25pm

science
An increase in temperature will create what type of shift in the following equation: 2SO3 = 2SO2+ O2 delta H = +197 kJ/mol? Wouldn't it be a shift right because there is heat involved?
Thursday, April 16, 2015 at 9:22pm

science
A mixture of nitrogen gas, hydrogen gas and ammonia gas reacts by: N2(g) + 3H2(g) = 2NH3(g) If the total pressure in the reaction vessel is 50.0 atm ans the equilibrium mixture contains by volume: N2= 96.143% H2= 0.3506% NH3= 3.506% what is the equilibrium constant (Kp)?
Thursday, April 16, 2015 at 8:35pm

Science
1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed Amplitude and wavelength Amplitude and frequency 2. Sound proof rooms...
Thursday, April 16, 2015 at 6:32pm

science
calculate the minimum guage pressure required at the base of building of height 200m for water to reach a closed tank at the of the building at the gauge pressure of 500Kpa
Thursday, April 16, 2015 at 3:04pm

Physical science
A trolley of mass of 20kg rolls down an incline from rest. The top of the incline is 10m above the ground. The trolley experiences a constant frictional force of 25N while it rolls down the incline. The velocity attained by the trolley at the bottom of the incline is 12m/s. ...
Thursday, April 16, 2015 at 2:00pm

Science
I need help with these question please. 1. how can you renewable heating & cooling? 2. how can you renewable hot water? 3. how can you renewable electricity?
Thursday, April 16, 2015 at 2:00pm

Science
Problem How could renewable energy sources be used in a house? Devise a Plan 1. Consider what you learned about renewable energy sources. Use what you learned to design a house that operates entirely on renewable energy sources. Focus on three major needs: (1) heating and ...
Thursday, April 16, 2015 at 1:43pm

science
What do bone marrow (the soft connective tissue that fills the internal spaces in bone) and the dermis (layer of the skin under the epidermis and over the hypodermis) have in common? (1 point) • They are both sites of new cell formation. • They both contain or are ...
Thursday, April 16, 2015 at 1:18pm

Science
1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed***** Amplitude and wavelength Amplitude and frequency 2. Sound proof ...
Thursday, April 16, 2015 at 1:10pm

Science
Which chemical equation shows that no atoms are lost during a chemical reaction? A. 8Fe+s8-->Fe5 B. 8Fe+8S8--> 8FeS C. Fe+8S8--->FeS D. 8Fe+S8--->8FeS Is the answer A?
Thursday, April 16, 2015 at 10:57am

Science
Johnny left a glass of milk on his bedside table for a week, and it spoiled. At the end of the week, the glass contained a yellow liquid with lumpy white chunks, and there was a terrible odor. What can be concluded? a) The milk has undergone a physical change. b) The mass of ...
Thursday, April 16, 2015 at 10:55am

Science
The current atomic model would be revised if a) better microscopes were being used to study its structure. b) better microscopes are invented in the future. c) new information about an atom's structure is discovered. d) a new element is discovered in the future.
Thursday, April 16, 2015 at 10:21am

science
How long does a car take to travel 30 m ,if it accelerates from the rest at a rate of 2.0 m/ s^2
Thursday, April 16, 2015 at 10:20am

Science
What volume of aluminium has the same number of atoms as 8.0cm^3 of mercury?
Thursday, April 16, 2015 at 10:17am

Science last question
Which of the following boxes would have the strongest gravitational pull on a third object positioned at an equal distance from both boxes? Box A: 100 g Box B: 10,000 g A. box b because it has more mass B. box a because it has less mass C. box a because it is bigger*** D. box ...
Thursday, April 16, 2015 at 12:38am

science
4. When a fan is turned on, it changes electrical energy into ______ energy. A. motion B. magnetic C. gravitational D. electromagnet 5. An experiment discovered that a particular material was a poor conductor of electricity. This material would most likely be used as an A. ...
Thursday, April 16, 2015 at 12:28am

science- urgent
How do humans grow crops on land that would naturally be either too dry or too wet? Explain. ?
Wednesday, April 15, 2015 at 9:39pm

Science
You mix oil and vinegar for a salad dressing. After a few minutes, the oil has seperated and is floating. Infer which has the greater density - oil or vinegar. Explain. I put "Vinegar has more density since it's on the bottom, where the oil has less since it seperated...
Wednesday, April 15, 2015 at 8:51pm

science
What can we learn from an experiment itself?
Wednesday, April 15, 2015 at 5:08pm

Science
A student is walking at 3.3 meters per second along a straight sidewalk. At a time of 6.8 seconds his position is at 19.7 meters right of the starting point. Later, the student is 52.5 meters to the right of the starting point. What was the time that the student walked to get ...
Wednesday, April 15, 2015 at 3:56pm

Science/Physics
My question is you walk 3.9 kilometers to school. In gym, you do the 12 minute run and actually make it 2.4 kilometers. After school you walk your friend home first and then go home it is 3.1 kilometers farther than your morning walk to school. What was your total distance ...
Wednesday, April 15, 2015 at 3:36pm

Science
You are trying to determine how far it is to your new friends house. You find out that you actually live on the same street. You also use the same bus stop. Google maps says that your house is 24 meters south of the shared bus stop. Your friend said that he measure his ...
Wednesday, April 15, 2015 at 3:30pm

Science
1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed***** Amplitude and wavelength Amplitude and frequency 2. Sound proof ...
Wednesday, April 15, 2015 at 11:14am

Science
Light waves strike a lamp shade. What property of light is demonstrated? A.diffuse reflection B.diffraction c.refraction D.regular reflection I think the answer is C but im not sure Please help
Wednesday, April 15, 2015 at 10:48am

Science
Which of the following illustrates mechanical weathering? 1.Carbonic acid weathers marble and limestone. 2.As plants grow, they produce weak acids that slowly dissolve rock. 3. Oxidation causes weathering in rock. 4. Repeated freezing and thawing in rocks causes weathering. ...
Wednesday, April 15, 2015 at 10:47am

science
1. What do bone marrow and the epidermis have in common? They are both sites of new cell formation. They both contain structures that assist the body in cooling down if overheating occurs. They both contain or are associated with sensory neurons. They are both involved in ...
Wednesday, April 15, 2015 at 10:43am

6th Grade Science Experiment
Hi, forget my first post. Can someone please explain what a dependent and independent variable is? Thanks and I don't have too much time either.
Wednesday, April 15, 2015 at 10:03am

science please help and explain asap
A rock of mass 5kg is pushed over the edge of a cliff which is 200m high 1.ignore air resistance and calculate the speed of the rock at the bottom of the cliff. In reality air resistance cannot be ignored. The rock eventually reaches terminal velocity of 30m/s 2.calculate the ...
Wednesday, April 15, 2015 at 9:45am

6th Grade Science Help PLEASE!
Hi, so I did the coin drop experiment. I finished project, wrote my hypothesis, my data, my observations, and my conclusion. What I need help is that in this experiment I don't know which on is the independent and dependent variable. That's all I need. Can someone ...
Wednesday, April 15, 2015 at 9:09am

Science
What is the momentum of a 2 kg rock moving at 3m/s?
Tuesday, April 14, 2015 at 9:07pm

Science
Describe the difference between the momentum between a tennis ball and a wrecking ball that is thrown at the same speed.
Tuesday, April 14, 2015 at 8:19pm

Science
Consider the carbon atom whose nuclear mass is 11.996amu.calculat mass defect when proton=1.00728amu,neutron=1.00867amu
Tuesday, April 14, 2015 at 3:57pm

Science
In the uranium mass 235,the binding energy was estimated as 3.0×10^-11Joules.Determine the energy released by 1g of uranium.
Tuesday, April 14, 2015 at 3:48pm

Science
The electron in a helium ion moves from a Bohr's orbit whose principal quantum number is 4 to another whose quantum number is 6.calculate the energy of transition in this process.
Tuesday, April 14, 2015 at 3:39pm

Science
Evaluate the value of the Bohr orbit in a hydrogen atom whose principal quantum number is 1.
Tuesday, April 14, 2015 at 3:32pm

Science
The assertion that 1g of uranium can produce energy equivalent to 10kg of coal implies that
Tuesday, April 14, 2015 at 3:28pm

Science
Which of the following characteristics x-ray photon emission? (a)electron capture (b)beta-decay (c)positron emmision (d)gamma-decay
Tuesday, April 14, 2015 at 2:37pm

Science
Which of these is odd in the series? (a)sodium (b)sulphur (C)plutonium (d)francium
Tuesday, April 14, 2015 at 2:18pm

Science
The equation of the reaction between 2 moles of proton and 2 moles of neutron producing Helium particles is a practical suggestion of (a)existence of neutral particle. (b)alpha-particles has no relationship with nucleus (c)electron is not part of helium. (d)nucleus is neutralize
Tuesday, April 14, 2015 at 1:57pm

Science
Which of these is not associated with camp ton effect? (a)when energy exceeds 1.02MeV. (b)energy of gamma-ray become less. (c)operative within the range of 0.6Mev and 4MeV of energy. (d)it doesn't result in low energy secondary radiation.
Tuesday, April 14, 2015 at 1:48pm

Science
The energy of transition of an electron from 5th to the 3rd Bohr orbit of a hydrogen atom
Tuesday, April 14, 2015 at 1:42pm

Science
The mass defect in a certain nuclear reaction is 0.108a.m.u.Determine the energy released in the reaction
Tuesday, April 14, 2015 at 1:35pm

Science
Element Y has a half life of 50days. How much of a 100mg of its sample will remain after 5 month?
Tuesday, April 14, 2015 at 1:31pm

Science
The most covalent of the chlorides; LiCL,BeCL2,MgCL2 and AlCL3 is (a)MgCL2 (b)AlCL3 (c)Licl (d)BeCL2
Tuesday, April 14, 2015 at 1:15pm

Science
The hydride of group VIA element are- Option (a)volatile covalent gases (b)volatile covalent solids (c)volatile covalent liquids (d)volatile ionic liquids
Tuesday, April 14, 2015 at 1:10pm

Science
1. A weatherman reports, "the storm waves are about 2 meters high and about 35 meters apart. "what properties of waves is the reporter describing? Frequency and wavelength Wavelength and wave speed***** Amplitude and wavelength Amplitude and frequency 2. Sound proof ...
Tuesday, April 14, 2015 at 11:43am

Science
Draw the position-time graph of a stationary body also draw velocity time graph of a stationary body
Tuesday, April 14, 2015 at 6:34am

science
You would expect that an injection of an opiate drug into the __________ would activate dopamine neurons in the nucleus accumbens. A. ventral tegmental area B. medial septal region C. periaqueductal gray matter D. preoptic area My choice is C
Monday, April 13, 2015 at 11:57pm

science
A panic-prone person who ingests a(n) __________ would be expected to show increased anxiety. A. benzodiazepine agonist B. tricyclic antidepressant C. MAO inhibitor D. benzodiazepine antagonist is it A
Monday, April 13, 2015 at 11:18pm

Mia
A Screamingly Good Science Lesson Elizabeth Kibler 1Amusement park rides give us thrills, exhilaration, and delight. If you pay attention, these rides can give you something else—a science lesson. Roller coasters are amazing rides that can twist and veer until you scream...
Monday, April 13, 2015 at 7:14pm

Science
What does the electron shell rotate around?
Monday, April 13, 2015 at 5:03pm

Science
why is electricity is not sent in smaller voltages from the power station rather than substation? why does the sub stations smaller the high voltages, why aren't they sent in smaller voltages from the power station?
Monday, April 13, 2015 at 4:18pm

Science
Which sphere of the Earth system contains nearly all of Earth's mass? A. the geosphere B. the atmosphere C. the biosphere D. the hydrosphere
Monday, April 13, 2015 at 1:43pm

Pysics science
How much work is done when a bucket of mass 1.5kg with 10g of water in it is pulled up from the bottom of a well 8m deep? Take g=9.8m/s2 (a)100.3j(b)2000.5j(c)901.6j(d)453.7j
Monday, April 13, 2015 at 1:19pm

science
girl of mass 40kg having v 2m/s jumps on a stationary cart of mass 4 kg find the velocity of girl when the cart starts moving
Monday, April 13, 2015 at 12:24pm

science
a solutioohol mixed with 125 cu.cm of water find the concentrationn contains 4.5 cu.cm of alc
Monday, April 13, 2015 at 12:23pm

earth science
What is the most abundant fossil fuel? A:Coal B:Gas C:Wood D:Oil
Sunday, April 12, 2015 at 9:48pm

Science
A Herculean bomber jet accepts 40kg of air per second at a velocity of 200m/s, burns 2kg of fuel at the same time,and releases exhaust gases at 600m/s relative to the bomber. find the thrust due to its engine.
Sunday, April 12, 2015 at 3:23pm

Science
Every individual, including young people, can make decisions to use resources wisely. Use the terms reduce, reuse, and recycle to explain how the students in the image above can help minimize solid waste.
Sunday, April 12, 2015 at 11:51am

Science
a flask contain 25 ml of HNO3 solution which requires 30 ml of 0.2 M KOH to complete the reaction. calculate the concentration of KOH. HNO3+ KOH= H2O + KNO3
Sunday, April 12, 2015 at 10:12am

science
A light spring is initially used to suspend masses from the ceiling. When a 4.0 kg mass is attached to the spring, its length is 22.0 cm. When an additional 2.3 kg mass is attached to the bottom of the 4.0 kg mass, the spring's length measures 26.8 cm. Determine the ...
Sunday, April 12, 2015 at 8:59am

Science
A block of weight 7.0N rest on a level floor. The frictional force between the block and the floor is 1.0N, A horizontal force of 1.4N is used to pull the block for 4s.what is the velocity of the block after this time?
Saturday, April 11, 2015 at 11:28pm

science
If the half life- period of a radioactive element is 1600.After how many years will if remains 25% of his quantity
Saturday, April 11, 2015 at 8:31am

biology/science
What are the biological terms for the following 1.process in biotechnology that is used to make human insulin in a bacterial cell 2.white blood cells produce antibodies in response to pathogens
Saturday, April 11, 2015 at 4:22am

science
Fossil fuels are a. A natural resource b. Renewable c. Made from minerals d. Burned in hydroelectric plants
Friday, April 10, 2015 at 8:05pm

life science
give the biological term for the following 1.process in biotechnology that is used to make human insulin in a bacterial cell 2.white blood cells produce antibodies in response to pathogens
Friday, April 10, 2015 at 5:07pm

science plz help ms sue
Compare and contrast spiral and elliptical galaxies. (Make at least 2 comparisons.) plz help me with eclest what is to comparisons
Friday, April 10, 2015 at 2:55pm

Science
Provide three statements that demonstrate the importance of units when describing motion. Please help and thank you!! asap Ms.Sue?
Friday, April 10, 2015 at 2:27pm

science ms sue plz help
1. Which layer of the sun's atmosphere are you looking at when you look at an image of a sun? A) Photosphere B) Chromosphere C) Corona D) Prominence 2. What materials could have been found in a giant cloud that formed the solar system? A- hydrogen and helium B- hydrogen ...
Friday, April 10, 2015 at 2:05pm

Science
A 45 N force is applied to a 9.6 kg object, what is it's acceleration?
Friday, April 10, 2015 at 12:41am

Science
Why do people debate on fossil fuels? Is it based on how its used? Thanks
Thursday, April 9, 2015 at 8:03pm

science
What does composition mean when you're talking about biotic and abiotic
Thursday, April 9, 2015 at 7:59pm

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