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December 20, 2014

Homework Help: Science

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Recent Science Questions

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Science - Check my answers please (6th grade)
When are tides in Earths oceans the highest? 1. during the moon's waning gibbous phase 2. during the moon's waxing gibbous phase 3. when the moon is at a right angle to the sun 4. When the sun, Earth, and moon are in a line.
Monday, April 7, 2014 at 12:50pm

Science
Refrigerators requires a lot of electricity and uses the most electrical energy in most household. May anyone tell me why it is so expensive to operate?
Monday, April 7, 2014 at 12:03pm

Science - Check my answers please (6th grade)
earth and the moon are kept in their respective orbits due to the influence of ? a) inertia b) gravity c) both inertia and gravity d) neither inertia and gravity Is it c) both inertia and gravity?
Monday, April 7, 2014 at 11:41am

science
In cat, the gene for black coat is dominant to the gene for white coat. A heterozygous black cat is crossed with a white cat. which of the following is true about the ratio of the offspring from the cross? Black coat, White coat A. 1,3 B. 3,1 C.4,1 D.4,0 can you please give me...
Monday, April 7, 2014 at 3:56am

Science
Please help !! Look at my other question on science plzzzzzzzzzzzz
Sunday, April 6, 2014 at 10:41pm

Science
When did Gregor Mendel publish his results ? When did people notice how important his work was ?
Sunday, April 6, 2014 at 10:25pm

science
Im researching a disease caused by a cellular organelle that does not function properly. My topic is "cardiamuscle disease" and its organelle is the cytoskeleton. Ive searched google but cant seem to find a website to help me begin
Sunday, April 6, 2014 at 9:38pm

science
What Develop hypotheses would you predicting the efficiency of solar energy from direct sunlight against the 4 variables tested?
Sunday, April 6, 2014 at 8:13pm

Physical Science
13. Why can convex mirrors only produce virtual images? Sadly, I can't find this answer in my book. :( Any help would be appreciated, please and thank you!
Sunday, April 6, 2014 at 6:27pm

science -heredity
there are about 100,000 genes in each cell. Why would it be important scientists to identify what every one of these genes does? I put Genes will describe a trait of a person, example, it will determine if a person will be small or tall; blue or brown eyes and brown or blond ...
Sunday, April 6, 2014 at 6:14pm

Science
What are ten observations made by Charles Darwin on his voyage and what are their significance?
Sunday, April 6, 2014 at 4:57pm

Science
How many mole of magnesium atoms are present in 0.50g of manesium (mg=24)
Sunday, April 6, 2014 at 2:06pm

science
2. Based on the results of your experiment, would you reject or accept each hypothesis that you produced in question 1? Explain how you determined this.
Sunday, April 6, 2014 at 8:17am

science
1. Develop hypotheses predicting the efficiency of solar energy from direct sunlight against the 4 variables tested?
Sunday, April 6, 2014 at 8:16am

science
4. How could you increase the electricity generated by a solar cell during the day, when the sun’s angle is constantly changin
Sunday, April 6, 2014 at 7:21am

science
A uniform AB 2m long Rod which exerts a downwards force of 60N at its centre is placed on a knife egde support position 0.8m from A determine the vertical downward force required at A to prevent rotation of the Rod.
Sunday, April 6, 2014 at 1:13am

Science
Give 2 examples for sources of electricity?
Saturday, April 5, 2014 at 4:18pm

6th Grade Science - Help
Which of Earth's spheres has the most mass? 1. atmosphere 2. hydrosphere 3. geosphere 4. biosphere Is it Biosphere?
Saturday, April 5, 2014 at 10:12am

physical science
Provide three statements that demonstrate the importance of units when describing motion.
Saturday, April 5, 2014 at 6:09am

science
which of the following examples does not demonstrate a change in velocity? an elevator coming to a stop as it reaches the top floor a cruise ship heading west at a constant speed a soccer ball passed across the field a train remains at a constant speed as it goes around a bend...
Friday, April 4, 2014 at 9:45pm

Science
5.00 mol of solid A was placed in a sealed 1.00-L container and allowed to decompose into gaseous B and C. The concentration of B steadily increased until it reached 1.10 M, where it remained constant. Then, the container volume was doubled and equilibrium was re-established. ...
Friday, April 4, 2014 at 8:31pm

physical science
Which of the following pairs of objects would have the strongest gravitational pull? two buildings in the same city ← two tall buildings in different cities two stars very far away from each other two stars very close to each other my answer is c
Friday, April 4, 2014 at 8:29pm

Science
1.) Use Newton’s first law of motion to explain how wearing a seat belt in a moving car could help prevent injury. 2.) A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she ...
Friday, April 4, 2014 at 8:02pm

SCIENCE HELP ASAP! :)
1.) Use Newton’s first law of motion to explain how wearing a seat belt in a moving car could help prevent injury. 2.) A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she ...
Friday, April 4, 2014 at 7:56pm

science
Which of the following pairs of objects would have the strongest gravitational pull? two buildings in the same city ← two tall buildings in different cities two stars very far away from each other two stars very close to each other my answer is c
Friday, April 4, 2014 at 6:44pm

science
Which of the following examples does not demonstrate a change in velocity? An elevator slows down in order to stop at the top floor ← A cruise ship travels west at a constant speed A soccer ball is passed across the field or ← A train remains at a constant speed ...
Friday, April 4, 2014 at 6:41pm

physical science
would 2 stars very far away from each other have a strong gravitational pull
Friday, April 4, 2014 at 5:26pm

physical science
is an elevator slowing down as it reaches the top floor a change in velocity?
Friday, April 4, 2014 at 5:17pm

science
Develop hypotheses predicting the effect of pyrite and coal on the acidity of water?
Friday, April 4, 2014 at 4:53pm

Science/Biology
Please check my answers: 1. Which of the following correctly states the relationship between monkeys and humans? A. Humans and monkeys evolved from apes. B. Humans evolved from monkeys. C. Humans and monkeys evolved from the same ancestor, which is now extinct. D. Humans ...
Friday, April 4, 2014 at 4:40pm

science
what doesn't have to be measured in order to describe motion
Friday, April 4, 2014 at 2:02pm

science
what type of friction does a maglev train reduce
Friday, April 4, 2014 at 1:58pm

science
When a basketball changes shape as it bounces off the floor is it because of balanced force acting on it?
Friday, April 4, 2014 at 1:10pm

science
how the structure of a virus correlates with its function.
Friday, April 4, 2014 at 12:46pm

Science
Discuss how the structure of a virus correlates with its function.
Friday, April 4, 2014 at 12:08pm

chemistry/science
Not sure if i posted this but Need help with my pH calculations? 0.10 mol of solid sodium hydrogen carbonate and 0.20 mol of solid sodium carbonate are dissolved in the same beaker of water, transferred to a volumetric flask and made to 250.0 mL. The Ka for HCO3 – ...
Friday, April 4, 2014 at 11:37am

Physics, science
An electric kettle contain 1.5kg of water at 100 degree and powered by a 2.0kw electric element. He the thermostat of the kettle falls to operate, approximately how long will the kettle boil dry? (take the specific latent heat of vaporization of water as 2000kJkg
Friday, April 4, 2014 at 10:02am

physical science
a model train moving at a constant speed around a circular track has a constant velocity?
Friday, April 4, 2014 at 8:56am

science
How can water cause both mechanical and chemical weathering?
Friday, April 4, 2014 at 1:02am

Physical science
1) how does the electric force between two oposite charges changes when the distance between the charges is tripled? 2)how does the electric force between two oposite charges changes when the amount of one charge is doubled?
Friday, April 4, 2014 at 12:32am

science
How does Newton's first law of motion explain the movement of your body when in a car in which you are riding stops suddenly?
Thursday, April 3, 2014 at 11:43pm

science
Suppose you were designing a statue to be placed outside your school. What materials would you use, and why?
Thursday, April 3, 2014 at 11:41pm

science
How can water cause both mechanical and chemical weathering?
Thursday, April 3, 2014 at 11:27pm

physical science
If You Were Riding A Train List Some Examples Of Items That Would Make It Seem Like You Weren't Moving
Thursday, April 3, 2014 at 11:18pm

science
What causes mid-ocean ridges to form?
Thursday, April 3, 2014 at 11:17pm

science
Suppose you were asked to select one renewable energy resource for use in your town. Which would you select, and why?
Thursday, April 3, 2014 at 10:48pm

science
Why is the periodic table usually drawn with hydrogen (H) separated from the rest of the elements?
Thursday, April 3, 2014 at 10:46pm

science
The coils in a toaster convert electrical energy into thermal energy. Heat from the coils is used to toast the bread. How is the heat from the coils transferred to the bread?
Thursday, April 3, 2014 at 10:36pm

science
What happens when light passes from one material to another?
Thursday, April 3, 2014 at 10:35pm

science
A researcher determined the amount of electrical energy entering a toaster and the amount of heat given off by the toaster. The amount of heat was less than the amount of electrical energy. How can this observation be explained?
Thursday, April 3, 2014 at 10:34pm

science
How does Newton's first law of motion explain the movement of your body when in a car in which you are riding stops suddenly?
Thursday, April 3, 2014 at 10:34pm

science
1. What causes mid-ocean ridges to form ? 2. Why are barrier islands important to people who live on the mainland ?
Thursday, April 3, 2014 at 10:15pm

science
discuss how the structure of a virus correlates with its function
Thursday, April 3, 2014 at 10:03pm

science
2. Why is it important to protect yourself from certain electromagnetic waves? What are some ways people protect themselves from these waves ?
Thursday, April 3, 2014 at 10:00pm

science
1. Describe 2 ways in which an electrically charged object and magnet are alike.
Thursday, April 3, 2014 at 10:00pm

science
The type of heat transfer called convection happens as a result of: a. electromagnetic waves b. the direct contact of particles in a substance c. the actual motion of a fluid in the form of currents d. All of the above I think it's C.
Thursday, April 3, 2014 at 9:36pm

Science
Physical properties used to indicate temperature changes include all of the following except a. color changes of liquid crystals b. volume changes of fluids and solids c. changes in electrical resistance d. odor changes in solids
Thursday, April 3, 2014 at 9:27pm

Science
fill in the blank questions monotremes, marsupials, and placentals have the same _____ known as the therapsid. a farmer sprays insecticide on his crops and notices that the insect pest problems disappear. a year later he tries the same insecticide only to find that he did not ...
Thursday, April 3, 2014 at 6:38pm

science(check answers)
60 kg cheetah reaches a speed of 30 m/s when chasing its prey
Thursday, April 3, 2014 at 4:37pm

science
A 2.1-kg brick is placed gently upon a 2.9-kg cart originally moving with a speed of 26 cm/s. Determine the post-collision speed of the combination of brick and cart.
Thursday, April 3, 2014 at 3:40pm

science
Imagine that you are the scientist who discovered cells. If you were to give a speech to a group of fellow scientists, what key points would you include that describe your accomplishments?
Thursday, April 3, 2014 at 2:27pm

Science - Check my answers
1. Which of the following statements best defines tides? when waves get bigger because of an approaching storm the rise and fall of ocean water that occurs about every 12.5 hours **** the rise of ocean water that occurs 12 times a day a giant wave that can be extremely ...
Thursday, April 3, 2014 at 1:21pm

science
To solve the problem of a polluted stream a scientist traced where the pollution came from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of ____________________ ...
Thursday, April 3, 2014 at 1:07pm

science
1. Why is the periodic table usually drawn with hydrogen (H) separated from the rest of the elements? 2. Finely ground sane can be poured like water. Why is sand considered a solid rather than a liquid? How is sand different than liquids?
Thursday, April 3, 2014 at 12:51pm

Science
To solve the problem of a polluted stream a scientist traced where the pollution came from. She determined that the pollution was coming from many small sources. She worked on a plan to help reduce the pollution to the stream. This is an example of ____________________ ...
Thursday, April 3, 2014 at 11:46am

science
1.   Which is most likely to be part of an ionic bond?  (1 point) an atom with no valence electrons an atom with one valence electron an atom with two valence electrons an atom with three valence electrons 2.   To form an oxygen molecule (O2), two...
Thursday, April 3, 2014 at 11:28am

science
Finely ground sane can be poured like water. Why is sand considered a solid rather than a liquid? How is sand different than liquids?
Thursday, April 3, 2014 at 10:25am

science
1. Why is the periodic table usually drawn with hydrogen (H) separated from the rest of the elements?
Thursday, April 3, 2014 at 10:24am

science
PLEASE HELP GUYS An ideal gas for which Cv = 3R/2 is the working substance of a Carnot engine. During the isothermal expansion, the volume doubles. The ratio of the final volume to the initial volume in the adiabatic expansion is 5.7. The work output of the engine is 9 x 105 J...
Thursday, April 3, 2014 at 9:44am

science
An ideal gas for which Cv = 3R/2 is the working substance of a Carnot engine. During the isothermal expansion, the volume doubles. The ratio of the final volume to the initial volume in the adiabatic expansion is 5.7. The work output of the engine is 9 x 105 J in each cycle. ...
Thursday, April 3, 2014 at 9:43am

physical science
what is the importance of ozone in the stratosphere for your health?what will happen to us when ozone depletion becomes more serious?
Thursday, April 3, 2014 at 5:22am

physical science
why it is necessary to apply sunscreen to your skin and wear sunglasses when you want sunbathe on the beach?
Thursday, April 3, 2014 at 5:18am

CAN ANYONE HELP?
I posted my science (chemistry) question and I have received no help and i really need to get this done so can someone please help??
Thursday, April 3, 2014 at 12:29am

Science (chemistry)
Write a balanced chemical equation and state the reaction type for each of the following reactions: a.) nitrogen gas reacts with hydrogen gas forming ammonia (NH3) b.) carbonic acid breaks down to form carbon dioxide gas and water c.) aluminum foil reacts with copper II ...
Wednesday, April 2, 2014 at 11:41pm

Reading Skills
This question is based on the following paragraph. (1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade ...
Wednesday, April 2, 2014 at 5:51pm

Reading Skills
This question is based on the following paragraph. (1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade ...
Wednesday, April 2, 2014 at 5:30pm

Reading Skills
This question is based on the following paragraph. (1) After my interview with these four young people, I reflected on the quiet sense of "difference" I sensed with many of these Upward Bound students. (2) As a college teacher who has also taught seventh-grade ...
Wednesday, April 2, 2014 at 5:26pm

Science
An example of a renewable and inexhaustible resource that requires the construction of dams is _________________________ energy. hydroelectric
Wednesday, April 2, 2014 at 3:27pm

Science
Geothermal power would be classified as a(n) _____________________ resource because its supply will not run out. renewable
Wednesday, April 2, 2014 at 1:26pm

science question?
can someone explain this to me? When the temperature is 68°F, the speed of sound in air is approximately 343 meters per second. Approximately how many kilometers does sound travel in five seconds?
Wednesday, April 2, 2014 at 12:00pm

computer science
Developing a habit to write good essays and dissertations can bring lots of accolades from faculty to any student. Does that mean each of the children can be expected to do it with similar success? ItâÃ&ce​nt;‚Â&...
Wednesday, April 2, 2014 at 3:41am

Science
In the temperature forest what are interactions with other organisms
Tuesday, April 1, 2014 at 9:13pm

Science
how does interdependence of organisms within an ecosystem aid survival in a temperate forest
Tuesday, April 1, 2014 at 9:11pm

science
what is a diaphragm
Tuesday, April 1, 2014 at 8:14pm

Science
How are LASERS produced? Is it a useful daily source of light?
Tuesday, April 1, 2014 at 5:22pm

Science
A______________________ is a tool used to capture the energy in sunlight. Recycling aluminum cans and taking shorter showers are two ways to practice the ________________________ of natural resources. Some plastics are made from corn. These plastics are biodegradable. This ...
Tuesday, April 1, 2014 at 12:43pm

science
the standard enthalpy of formation of ammonia is -46 kj/mol. if the enthalpy of formation of hydrogen molecule is -436 kj/mol and that of nitrogen molecule is -712 kj/mol find the average bond enthalpy of N-H bond in ammonia
Tuesday, April 1, 2014 at 7:41am

science
A 750w motor might also be rated as a 0.5horsepower motor 1 horsepower motor 2 horsepower motor 10 horsepower motor
Monday, March 31, 2014 at 10:43pm

Physical Science 9
what sequence of process must happen for an atom of carbon to go from a man to a car?
Monday, March 31, 2014 at 10:27pm

Science URGENT
Is there any website or any way I can get the science probe 10 check your understanding answers cause I want to check my answers?
Monday, March 31, 2014 at 9:12pm

Science
Is there any website or any way I can get the science probe 10 check your understanding answers cause I want to check my answers?
Monday, March 31, 2014 at 8:50pm

science(check answers)
1.---please help 2.C 3.D 4.C 5.A 6.C 7.---please help 1.An advantage of using an electromagnet,shown on the crane in the image below,instead of a regular magnet to move cars in a junkyard is that an electromagnet can easily be turnd on and off. A.true B.false 2.Imagine two ...
Monday, March 31, 2014 at 5:01pm

physical science
How many kilocalories of heat does the operation of a 1285 W hair dryer produce each second?
Monday, March 31, 2014 at 2:50pm

science
1.   Use the diagram to answer question 1. description: particles have enough energy to break free from each other and can move around freely; particles spread out in different directions  sketch: What kind of substance is described?  (1 point) solid ...
Monday, March 31, 2014 at 2:24pm

Science
What tool is used to capture the energy in sunlight?
Monday, March 31, 2014 at 2:23pm

Science
which of the following does not reduce water pollution?
Monday, March 31, 2014 at 1:35pm

science(check answers)
1.D 2.A 3.A 4.im not sure please help 5.false One light bulb in a string of lights goes out. This causes all of the other lights in the string to also go out. This is an example of a A. resistor. B. parallel circuit. C. closed circuit. D. series circuit. 2.When a switch is ...
Monday, March 31, 2014 at 1:11pm

Science
1. Rewrite the word equation as formula equation: Aluminum + copper (II) chloride= aluminum chloride + copper 2. What is not equal in these chemical formula equations: a.) magnesium + oxygen = magnesium oxide B.) water = hydrogen + oxygen c.)methanol +oxygen = carbon dioxide...
Sunday, March 30, 2014 at 8:01pm

Math
Michael has a science project due. He knew that it would take him 4 hours to complete the project. He needed to spend 50% of his time on his experiment, 40% of his time on his analysis, and 10% on putting his project together. What is the ratio of time spent putting his ...
Sunday, March 30, 2014 at 7:58pm

Physical Science 9
what part of the carbon process is responsible for the release of carbon at a p[power plant combustion photosynthesis digestion decomposition my answer is a combustion
Sunday, March 30, 2014 at 7:56pm

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