Wednesday
May 27, 2015

Homework Help: Science

Branches of Science

Recent Science Questions

physical science
A baseball diamond has 90 feet between bases. A player hits the ball and runs to 1st, 2nd and stops at 3rd base. The player's displacement is
Wednesday, April 29, 2015 at 2:02pm

Physcial Science
Standing on top of a tall building a student drops their physical science book. How far has the book fallen at 5 s?
Wednesday, April 29, 2015 at 11:28am

science
The aquarium was sealed and placed at a bright corner. After two weeks, both the number of water plants and water snails increased. (a) Besides their gaseous needs, state one other way in which the water snail and the water plant are interdependent.
Wednesday, April 29, 2015 at 9:58am

Science
Can you give me examples of palatable inorganic acids other than phosphoric acid?
Wednesday, April 29, 2015 at 8:45am

science
A uniform plank of a seesaw is 5 meter long and supported at its centre.a boy weighing 40kgf sits at a distance 1.5meter from one end of the seesaw.where must a girl weighing 25kgf sit on the other end of the seesaw so as to balance the boy.
Tuesday, April 28, 2015 at 11:45pm

computer
17. Which of the following sources likely has the most reliable information? A. A graduate student's blog that was updated ten months ago B. A company-sponsored website with detailed citations C. A computer science textbook written by an expert in the field in the early ...
Tuesday, April 28, 2015 at 7:19pm

science
Jenny is doing an experiment to see if students in her class like apples or oranges best. She will offer each student an apple or an orange. Then she will record how many students took each kind of fruit.What is a valid prediction Jenny could make about the results of her ...
Tuesday, April 28, 2015 at 3:02pm

science
HIV. B. Reed-Sternberg cells. C. Epstein-Barr virus. D. ARC
Tuesday, April 28, 2015 at 2:38pm

Science Please help me Ms. Sue?!?!?!?
1) Forests and fisheries are examples of A. abiotic factors B. energy factors C. renewable resources*** D. nonrenewable resources 2) How has the human population changed during the last 50 years? A. The human population has increased exponentially*** B. The human population ...
Tuesday, April 28, 2015 at 2:06pm

science
how many of its photons are required to ionize atomic hydrogen? Einstein quote for Lenard’s measurement of the “largest effective wavelength for air”=190 nm,, For this problem, take the energy of the ground state of the hydrogen atom to be −0.99946650834R...
Tuesday, April 28, 2015 at 1:59pm

science
How much heat is added to 10 g of water when you start from room temperature and heat it to its boiling point?
Monday, April 27, 2015 at 10:33pm

science
When comparing the flow of lymph in the lymphatic system with the flow of blood in the circulatory system, it can be said that the lymphatic system also A. contains fluid that travels in a closed circuit. B. uses a pump. C. contains fluid that travels in only one direction. D...
Monday, April 27, 2015 at 7:57pm

SCIENCE HELP! Ms.Sue
Check my answers! In the 1930s, windmills were widely used to generate electricity on most farms in the united states. which kind of energy resource is used in windmills? A. Recyclable energy B. Nonrenewable energy C. Renewable energy**** D. Potential energy The amount of land...
Monday, April 27, 2015 at 5:54pm

Computer science(Information Retrieval Architectur
Given the following three items where w2, w4, etc. all represent different words. Compare how well the shingle process works in determining which items are near duplicates by looking at the shingles composed of 3 words versus shingles composed of 6 words. Use the rolling ...
Monday, April 27, 2015 at 2:00am

Computer science(Information Retrieval Architectur
9. Given the following documents determine the weights for Naïve Bayesian category for document to be about “Trees”. Given the new document listed determine if it should be given the category or not. (14 points) Doc1 Oak, Plum, rose, Oak, Oak, Plum, ash, ash, ...
Monday, April 27, 2015 at 1:57am

Computer science(Information Retrieval Architectur
9. Given the following documents determine the weights for Naïve Bayesian category for document to be about “Trees”. Given the new document listed determine if it should be given the category or not. (14 points) Doc1 Oak, Plum, rose, Oak, Oak, Plum, ash, ash, ...
Monday, April 27, 2015 at 1:53am

Computer science(Information Retrieval Architectur
PATRICIA TREE: a. Create the PATRICIA Tree and Reduced PATRICIA for the following 01010101010110 to 8 levels of sistrings (level 1 is original string). b. Assuming a search term of 01010101111 calculate the number of comparisons needed for the PAT tree and the reduced PAT tree.
Monday, April 27, 2015 at 1:51am

Computer science(Information Retrieval Architectur
Stemming: a. Compare advantages and disadvantages of Porter Stemming algorithm, Dictionary stemming algorithm and Success Variety stemming algorithm. b. Create the symbol tree for the following words (canopy, cars, cabony, cabossy, cabort, cabins, cabity, cabiry) Using ...
Monday, April 27, 2015 at 1:50am

Computer science(Information Retrieval Architectur
A. Why are inverted files the most typical structure used for search systems? How does n-grams modify the inversion list approach? B. Discuss the similarities and differences between N-gram and PATRICIA TREE approach to indexing.
Monday, April 27, 2015 at 1:46am

Computer science(Information Retrieval Architectur
a. Describe how the statement that “language is the largest inhibitor to good communications” applies to Information Retrieval Systems. b. Relate this to the challenges in information retrieval that make it difficult to find the information a user is looking for. c. ...
Monday, April 27, 2015 at 1:45am

Computer science(Information Retrieval Architectur
Consider the use of entity identification and categorization. a. What problems are they trying to solve – what are they trying to do. b. How do they affect the list of processing tokens in an item? c. How do they affect the Document Vector for the item?
Monday, April 27, 2015 at 1:42am

science
A harmonic wave is traveling along a rope. The oscillator that generates the wave completes 49.0 vibrations in 20.8 s. A given crest of the wave travels 402 cm along the rope in a time period of 14.9 s. What is the wavelength?
Sunday, April 26, 2015 at 7:59pm

science help
Explain how the hooves of the camel are adapted to move in the dessert.
Sunday, April 26, 2015 at 5:12am

science
1.Which of the following could be true of two different species that have a competitive relationship in the same ecosystem? A.One species preys on the other. B.The relationship is mutually beneficial. C.They share the same niche. D.One species benefits, while the other is ...
Saturday, April 25, 2015 at 2:28pm

Science-Physics
From what height was a brick dropped if it hit the ground with a speed of 4.3 m/s?
Saturday, April 25, 2015 at 12:54pm

Science
How much force is exerted to lift 750 kg of water in the well against the force of gravity? How much work is done to lift this water .05m? How does this compart to hte work done byt he man in teh treadmill?
Saturday, April 25, 2015 at 12:12pm

physical education
For science fair project interview from an expert: 1. How much should my time improve in 30 days running a mile? 2. Will the type of shoe I wear affect my running time? 3. How will the weather affect my time? 4. Do different track surfaces affect my time? 5 What can I do to ...
Friday, April 24, 2015 at 10:56pm

Science help
Which of the following illustrates conduction as a mode of heat transfer? a) A microwave oven produces electromagnetic waves that transfer to the food in the form of heat*** b) leaving a metal spoon in a bowl of hot soup will make the spoon hot as well c) Pasta rises and falls...
Friday, April 24, 2015 at 7:01pm

Science
Which evidence from the sea floor shows that tectonic plates move? a) the sea floor is youngest near a mid-ocean ridge and older farther away b) The sea floor is much older than the continents c) mid-ocean ridges form the longest range of mountains on earth d) The sea floor is...
Friday, April 24, 2015 at 6:44pm

Please Help, I REALLY need it btw-science
1. which of the following is not a method by which minerals form? a) crystallization b) decrystallization c) water evaporation from a solution d) cooling of magma or lava (more will be listed)
Friday, April 24, 2015 at 6:38pm

Computer Science
What are the types of errors that can be encountered in programs?
Friday, April 24, 2015 at 3:52pm

Science
uppose some natural disaster occurs and a species of finch is forced to relocate from its original island where us dined on cactus flowers ti ab adjacent island with many fewer cacti but an overabundance of orchids. what would be the immediate consequences to the species in ...
Friday, April 24, 2015 at 2:01pm

Science
A gardener plants several flowering plants of the same species and notices that about 10% of the plants produce larger flowers than the others. He keeps track of the distribution of flower sizes over several years as shown in the table below. What explains these observations? ...
Friday, April 24, 2015 at 1:46pm

science
Which of the following is not a characteristic of igneous rocks? a. Igneous rocks are formed when molten rock cools and hardens. b. Igneous rocks have crystal grains. c. Igneous rocks are larger in size because the rock cooled more slowly after the hot lava came out from the ...
Friday, April 24, 2015 at 11:52am

science
__________ rocks forms when a rock is changed by heart,pressure, or chemical reactions. a) Igneous b) Sedimentary c) Metamorphic d) Chemical i think its c
Friday, April 24, 2015 at 11:47am

physical education
For science fair project interview from an expert: 1. How much should my time improve in 30 days running a mile? 2. Will the type of shoe I wear affect my running time? 3. How will the weather affect my time? 4. Do different track surfaces affect my time? 5 What can I do to ...
Friday, April 24, 2015 at 9:32am

science
Are BEVs or hydrogen fuel cell vehicles a more promising transportation technology for the future? (This is question #3 from p. 608.) Should car companies be required to produce electric cars?
Thursday, April 23, 2015 at 9:38pm

Some research questions
I missed this week until today, and my science professor told me I have until tomorrow to do at least 50% of this project. Project: A 20 slide power point presentation over economy and environmental issues in Bolivia. Must include pictures, extra points for sound. Country ...
Thursday, April 23, 2015 at 8:51pm

science
Infer how zebra mussels change the biotic conditions in an aquatic ecosystem. How could the changes affect the biodiversity of the ecosystem?
Thursday, April 23, 2015 at 8:03pm

Science
What are some home appliances that can cause phase changes?
Thursday, April 23, 2015 at 5:06pm

math
in a science experiment the temperature of a liquid dropped 30 degrees over 6 hours what integer shows the average hourly temperature change of the liquid
Thursday, April 23, 2015 at 4:52pm

Science
the force of gravity on jupiter is much stronger than the force of gravity on earth. which of the following explains why this is true. A. Jupiter's orbit is farther away from the Sun and Earths orbit B. Jupiter has more mass than Earth C. Jupiter's orbit is closer to ...
Thursday, April 23, 2015 at 2:52pm

Science
if 225 ml of 0.25M HCL and 25ml of 2.5M NaOH was used what is the limiting reagent in this experiment?
Thursday, April 23, 2015 at 12:54pm

Science Check
This is the question Consider a wetland ecosystem similar to the one shown in the image below. In this ecosystem are two species: a small fish species and a wading bird species that feeds on the small fish as its main source of food. Oxygen levels are a limiting factor.Suppose...
Thursday, April 23, 2015 at 11:33am

Physical Science
At 27 degrees Celsius and 750 mm Hg, a sample of hydrogen occupies 5.00 L. The space it occupies at STP = 4.49 L. Should the 4.49 L be rounded to 4.5 L? If not, is there a specific rule that explains rounding for this type of problem?
Thursday, April 23, 2015 at 11:01am

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...
Thursday, April 23, 2015 at 9:56am

Science
Explain how a thermocouple works. What are thermocouples used for?
Wednesday, April 22, 2015 at 7:33pm

Life science
A pure-breeding black coat cat was crossed with a hybrid black coat cat. (a)Represent the diagrammatically .(b)What percentage of the offspring
Wednesday, April 22, 2015 at 2:38pm

science
4. A 70.0 g sample of water at 95.00°C is mixed with 50.0 g of water at 135.0°C. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. Remember that the heat gained by the cooler water is equal to the heat lost by the warmer water.
Wednesday, April 22, 2015 at 2:05pm

science
A 30.0 g sample of water at 280. K is mixed with 50.0 g of water at 330 K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings. Remember that the heat gained by the cooler water is equal to the heat lost by the warmer water.
Wednesday, April 22, 2015 at 2:04pm

science
2. A 75.0 g sample of a metal is placed in boiling water until its temperature is 100.00C. A calorimeter contains 100.00 g of water at a temperature of 24.40C. The metal sample is removed from the boiling water and immediately place in water in the calorimeter. The final ...
Wednesday, April 22, 2015 at 2:04pm

Science- Earth's History- 1 question
Which of the following events occurred during the Mesozoic era? a. Dinosaurs became common on land. b. Whales and dolphins evolved in the oceans. c. Reptiles evolved on land. d. The supercontinent Pangaea formed. i think its c
Wednesday, April 22, 2015 at 10:39am

science
the sun photosphere gives off radiation that reaches earth as what
Wednesday, April 22, 2015 at 10:21am

Science
What is the equilibrium concentration of silver ions at 25 degrees C in a 1.0-L saturation solution of silver carbonate to which .20 mole of NaHCO3 has been added? The Ksp of Ag2CO3 is 8.1 x 10-12 at 25 degrees C
Tuesday, April 21, 2015 at 11:35pm

Science
On an inclined plane, how much force will move a resistance of 30 kg? I know that 5 kg of force will move a resistance of 15 kg, but cannot see the connection between the two numbers to finish the rest of the examples.
Tuesday, April 21, 2015 at 11:13pm

Science
How do you think that a plane could initialize the dragging? (Think of the parts of the wing that move)
Tuesday, April 21, 2015 at 9:52pm

Science
The effect _______ explains how fast air moves across a surface, the ____ pressure that presses on that surface. In contrast, the more ____ that air moves, the more of _____ there will be. I'm sorry that it might not make sense, I translated it from French. I tried using ...
Tuesday, April 21, 2015 at 9:41pm

Science
What are the four flight forces? Give a brief description of each.
Tuesday, April 21, 2015 at 8:20pm

Science
If you lift a 15 °C unsaturated air bubble from the surface to 1 km height, what would be its final air temperature?
Tuesday, April 21, 2015 at 5:59pm

Science
If you lift a 15 °C air bubble from the surface to 1 km height and the environmental temperature at 1 km is 10 °C, what stability does the atmosphere demonstrate at this level?
Tuesday, April 21, 2015 at 5:57pm

science
Which of the following is called the "master gland"? A. Pancreas B. Adrenal C. Thyroid D. Pituitary
Tuesday, April 21, 2015 at 4:57pm

science
Which of the following best describes the overall function of hormones? A. To control physiological processes in the body B. To stimulate the growth and maturation of body organs C. To provide a pathway for nerve messages D. To determine masculine or feminine reproductive traits
Tuesday, April 21, 2015 at 4:46pm

science
A boy is pushing a lawn mower with a force of 200N.The force makes an angle of 20° with hprizontal . 1. determine the force applied to move the lawn mower forward 2. Maximum height reached by an object.
Tuesday, April 21, 2015 at 1:42pm

Pysics science
The resultant of vectors A⃗ and B⃗ has a magnitude of 20 units. A⃗ has a magnitude of 8 units, and the angle between A⃗ and B⃗ is 40o . Calculate the magnitude of B⃗
Tuesday, April 21, 2015 at 1:13pm

Science
In what ways are electric generators and motors similar? In what ways are they different?
Monday, April 20, 2015 at 10:05pm

Science
a 9 kg bowling ball rolls off a table and strikes the ground. if the ball isi n the air for 0.5 seconds, how fast is the ball moving when it hits the ground?
Monday, April 20, 2015 at 9:23pm

Physical science
A hydraulic lift is used to lift a heavy machine that is pushing down on a 3.0 m2 piston A1 with a force F1 of 1200 N. What force F2 needs to be exerted on a 0.090 m2 piston A2 to lift the machine? im having problems tring to solve it can you please help me?
Monday, April 20, 2015 at 8:42pm

Science (Chemistry)
Why do ionic materials dissolve so well in water, but not in Hexane?
Monday, April 20, 2015 at 8:22pm

History
How were William Lloyd Garrison and the Rev. Elijah Lovejoy alike? Both lived in Boston and were Underground Railroad conductors. Both printed newspapers with antislavery messages in the North. Both used their houses as Underground Railroad stations and risked their lives for ...
Monday, April 20, 2015 at 7:27pm

Science
When evolution was first proposed, which of the following was used as evidence to support the idea? 1.observations of nature 2.laboratory experiments 3.extensive fossil collections 4.genetic sequences 1.?
Monday, April 20, 2015 at 7:04pm

Science
The mass of 1 liter of water is approximately 1000g. If you consume 1 liter of water,ow many water molecules did you consume?
Monday, April 20, 2015 at 6:38pm

Science
The diagram below shows a process in Earth's crust. Which of the following statements best describes the process in the diagram. A Converging plates from Mountains B Converging plates from Volcanoes C Diverging plates form Mountains D Diverging plates form a rift valley I ...
Monday, April 20, 2015 at 4:47pm

science 8th (:: 1 question
The ball in the image below is rolling toward the block. The ball will create a disturbance in the stability of the block by knocking it over. Which of the following correctly predicts what will happen to the block? [image of ball rolling toward tall, skinny block] - Unstable ...
Monday, April 20, 2015 at 1:18pm

science 8th (::
1. According to Ohm’s law, what is the resistance of a lightbulb if the applied voltage is 21.0 V and the current is 3.0 amps? (1 point) 24 ohms 7.0 ohms 18 ohms*** 3.0 ohms am i right?
Monday, April 20, 2015 at 1:14pm

Science
How many number of gold atom are present in 0.6 gm of 18 carat gold.The 24 carat gold is taken as 100% pure gold.(atomic mass of gold=197a.m.u)
Monday, April 20, 2015 at 8:05am

Science
Which of the following statements is true? A. There is more water on Earth now than there was millions of years ago. B. There is less water on Earth now than there was millions of years ago. C. There is no way to tell how much water was on Earth millions of years ago. D. There...
Sunday, April 19, 2015 at 8:57pm

Science
How does a hurricane form? A. It forms over warm ocean water as a low-pressure area. B. It forms over warm ocean water as a high-pressure area. C. It forms over cool ocean water as a low-pressure area. D. It forms over cool ocean water as a high-pressure area. Is the answer B...
Sunday, April 19, 2015 at 8:48pm

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

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

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