Monday
August 29, 2016

Homework Help: Science

Branches of Science

Recent Science Questions

Science
I have a project for science and we have to design an experiment to support the hypothesis that light travels in straight lines except at the point it enters a new medium. Does anyone have any examples I could use for this project?
Friday, May 6, 2016 by Twenty One Pilots fan

science
I believe the angle of refraction will be ___________ when it goes from a ________ to a _______________ because ____________________________________. Please help
Friday, May 6, 2016 by anonymous

science
The gas-phase reaction, A2 + B2 --> 2AB, proceeds by bimolecular collisions between A2 and B2 molecules. If the concentrations of both A2 and B2 are doubled, the reaction rate will change by a factor of.....? Will you please explain instead of just giving me an answer. thanks
Thursday, May 5, 2016 by pepe

maths science
a mixture of 0.5 mol H2(g) and 0.5 mol 02(g) is allowed to react in a container of volume 200 cm3 .represent in the table
Thursday, May 5, 2016 by josephine

science
A stone projected at an angle of 60 degree and intial velocity of 20 meter second determing the time of flight
Thursday, May 5, 2016 by abdullahi

Science
How do I prepare 15% mercuric sulphate in 15% sulphuric acid?
Thursday, May 5, 2016 by Deovolente

Science
Early this spring researchers have recently discovered that there is one small remnant population of endangered bluegrass left in a small prairie plot outside of Kansas City. If there are approximately 850 individuals in the cohort, how many individuals can the researchers ...
Thursday, May 5, 2016 by Anonymous

science
A sled is tied to a tree on a frictionless snow covered hill,as shown.If the sled weighs 77N ,1)Find the magnitude of the tension force T exerted by the rope on the sled .2)Find the magnitude of the normal force applied by the hill on the sled.MY WORK IS AS FOLLOWS T-Wx=0. T-...
Thursday, May 5, 2016 by ZENANDE

Science
Consider the following food chain: hawk - rabbit - clover. Each species will contain a different amount of calories in its body (clover: 10 calories, rabbit: 500 and hawk: 1200). Each species has a different daily caloric requirement (clover: sunlight, rabbit: 100 calories, ...
Thursday, May 5, 2016 by Alejandra

Science
Consider the following food chain: hawk - rabbit - clover. Each species will contain a different amount of calories in its body (clover: 10 calories, rabbit: 500 and hawk: 1200). Each species has a different daily caloric requirement (clover: sunlight, rabbit: 100 calories, ...
Thursday, May 5, 2016 by Alejandra

Science
Consider the following food chain: hawk - rabbit - clover. Each species will contain a different amount of calories in its body (clover: 10 calories, rabbit: 500 and hawk: 1200). Each species has a different daily caloric requirement (clover: sunlight, rabbit: 100 calories, ...
Thursday, May 5, 2016 by Anonymous

science
the African plate is moving toward the Eurasian plate at a rate of a few centimeters per year. how will this area change in 100 million years? in your answer, consider how continents will change and how the Mediterranean sea will change.
Thursday, May 5, 2016 by kyle

science
a geologist working in a national park finds a mineral. He is caring a kit that contains a Penney, a hand lens, a geologist hammer, and a jackknife. describe how the geologist can use these items determine some of the minerals chartist
Thursday, May 5, 2016 by kyle

science
tom is marking the locations of active volcanos on a world map. explain how the locations of the volcanoes are related to earths plates
Thursday, May 5, 2016 by kyle

Science (PhYsics)
A tire 0.5m in radius rotates at a constant rate of 200 rev/min. find the speed and acceleration of a stone lodged in the tread of the tire (on its outer edge)
Thursday, May 5, 2016 by Chulu

Physical science
Is magnitude of displacement is greater than the distance travelled by an object?
Thursday, May 5, 2016 by Sumit

Science
In Kjeldhal's method, Conc. H2SO4,NaOH & Boric acid is used to measure the % of nitrogen in a sample. If , in a sample HgCl2 is added , will it interfere the reaction? Accurate conc. of nitrogen will be determined or not?
Thursday, May 5, 2016 by Jyoti

science
A standard addition method is used to determine the concentration of ethanol in an unknown sample. Six 10 mL aliquots of the unknown are drawn from the processing vat. An aqueous solution of ethanol is standardized to have 1.57 g/L. This standard is pipetted to five of the ...
Thursday, May 5, 2016 by asery

Science one question dont understand plz help ASAP
i know that from earth to the moon is 238,855 miles but i dont know how much that is in months
Wednesday, May 4, 2016 by Thikra

science
If a radioactive isotope has a half life of 10 years and you start with 100 grams what is the fraction left, percentage left, and amount of original in grams I would like for you to explain how to do it not tell me the answer that's the question
Wednesday, May 4, 2016 by keona

health science chemistry
How many ml of water should be added to 20.0 ml of a stock of 12.0 M HCl solution to make 1.50 M HCl ?assume that the volumes are additive.
Wednesday, May 4, 2016 by konja

math literacy, life science, history,sotho
What careers can I study for, where and how much will it cost????
Wednesday, May 4, 2016 by pitso ROFIWA

9th grade Physical Science
Two dogs are fighting over a rope. The first dog is pulling with 10N to the right. The second dog is pulling with 15N to the left. Which way will the rope move?
Wednesday, May 4, 2016 by Jennifer

Science
How does the force the rocket is launched with affect the distance it travels?
Wednesday, May 4, 2016 by Dilnoza

Science
Hello, I was just wondering what it means when something says "a white flower is crossed with a red flower" Could anyone please tell me?
Wednesday, May 4, 2016 by Val

science
Lesson 9: Energy and the Environment Unit Test Science 7 B Unit 3: Energy and the Environment does anyone have answers to this text C.A
Wednesday, May 4, 2016 by Katie

Early childhood
What is a natural way for primary kids to process science skills
Wednesday, May 4, 2016 by Anonymous

Science
| | | | |||||||| | | | | |||||||| ^ ^ rarefaction Compression what type of wave us shown above? A: B: C: D:
Wednesday, May 4, 2016 by Science Nerd

Science
The tracks of the astronauts who landed on the moon are still there in the dust and show no signs of being worn away. This is attruted to the lack of atmosphere on the moon. Which of the following best accounts for the lack of atmosphere. 1)the moon's weak gravity 2)the ...
Wednesday, May 4, 2016 by Zay

mqth and science early childhood
​Children do not need a variety of concrete experiences that enable them to learn the properties of Earth's materials
Wednesday, May 4, 2016 by latavia robinson

science
The contents of a can of air freshener are gaseous when sprayed, but remain a liquid while in the can due to ___.
Wednesday, May 4, 2016 by becky

science
When exposed to the same amount of heat for the same amount of time, a 3 g sample of copper will experience a greater temperature change than a 12 g sample of copper due to its smaller ___.
Wednesday, May 4, 2016 by becky

science
When molecules of water vapor in the air come into contact with a cold can of soft drink, they lose energy, slow down, and form a liquid due to a decrease in ___.
Wednesday, May 4, 2016 by becky

Science
A sprinter has an average speed of 10.2 m/s. What distance, in meters, would the sprinter run in 9.80 s? (Record your answer to the correct number of significant digits)
Wednesday, May 4, 2016 by HELP ASAP

Science
The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is __________ s. (Record your answer to the correct number of significant digits)
Wednesday, May 4, 2016 by HELP ASAP

Science
Characteristics non-living things
Wednesday, May 4, 2016 by Heien

Science PLEASE HELP!
What are some hypotheses that have been proposed for the mass extinctions throughout geologic time? Please refer to a specific time period and the organisms which became extinct. ----------------------------------------​------------------------------------ I was thinking...
Wednesday, May 4, 2016 by Gracious Human

science
three point electric charges q,2q,4q are placed at the three vertices of an equilateral triangle inscribed in a circle. find the net elect ric field at the centre of the triangle. answer : I think the answer is( 9×10^9 ×q√10)/r^2 ,where r is the radius of ...
Wednesday, May 4, 2016 by shivansh

Science
How does the sun and wind help bioversty?
Wednesday, May 4, 2016 by Jake

Science
If water temperature changes in favor of greater oxygen levels how do the population of the fish and wading bird population change in response to the new oxygen over time? I would think the fish population would increase and so would the birds (because the fish increase) but I...
Wednesday, May 4, 2016 by Jake

Science
I have to show in a graph my results of the time that my charged balloons stuck to the door, refrigerator, table, cabinet, wall, ceiling, floor and window pane. Could I do this in a bar graph?
Wednesday, May 4, 2016 by Robbie

science
If oxygen have 8 protons and 5 electrons is it stable
Tuesday, May 3, 2016 by Anonymous

science
A small fish in the Pacific Ocean watches a shark swim by a large rock a few meters away. Which of the following is the the reference point in this scenario? A. Shark B. Large rock C. Water D. Pacific Ocean Is the answer C?
Tuesday, May 3, 2016 by Larry

Science
If a ball A moves at X speed eastwards collideds with a stationary ball B. Ball A now moves at Y speed north east (40 degrees upwards from eastward direction) and ball B moves at W speed south east (50 degrees downwards from eastward direction). To calculate their kinetic ...
Tuesday, May 3, 2016 by Loli

Osizweni High School. doing Maths and science
In the case of considering the effect of intermolecular forces(IMF) on liquids. What is the difference between monograde and multigrade oil?
Tuesday, May 3, 2016 by Zinhle ngwenya

science
Tom is markina locations of active volcanoes on a world map explain how the locations of the volcanoes are related to Earth's plates
Tuesday, May 3, 2016 by kyle

Science
A child uses 168 J of work pulling a wagon 25 m up a hill. What is the force exerted on the wagon by the child? (Record your answer to the correct number of significant digits)
Tuesday, May 3, 2016 by Hanny

Science
A fan pushes a beach ball with a force of 10.0 N. If the work done on the ball is 150 J, the distance the ball will travel is ______ m. (Record your answer to the correct number of significant digits)
Tuesday, May 3, 2016 by Hanny

Science
The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is __________ s. (Record your answer to the correct number of significant digits)
Tuesday, May 3, 2016 by HELP ASAP

Science
The time it takes for a puck to travel from the blue line to the net (d = 18.3 m) if the puck has velocity of 40 m/s is __________ s. (Record your answer to the correct number of significant digits)
Tuesday, May 3, 2016 by HELP ASAP

science
15,000,000 blood cells are destroyed every second to make room for new blood cells how many blood are destroed every hour
Tuesday, May 3, 2016 by terence

science
how many times do we blink per minite
Tuesday, May 3, 2016 by naomie

science
How does the law of conservation of matter apply to mixtures? The law of conservation of matter is a law that states matter cannot be created or destroyed. But how does that affect mixtures HELPPPPP
Tuesday, May 3, 2016 by student

science
What influence does the density of methylated spirit have on the surface tension?
Tuesday, May 3, 2016 by Gontse

Science
A block and tackle consisting of 5 pulleys is used to lift a car engine weighing 850kg. What is the Velocity
Tuesday, May 3, 2016 by Hohenzollern

Science
Calculate the mass of silver deposited when a current of 2.6 A ls passed through a solution of silver salt for 70 minutes. (Ag=108; 1 faraday=96 500 c)
Tuesday, May 3, 2016 by Anonymous

Science
1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted materials. C) A ...
Tuesday, May 3, 2016 by Anonymous

Science
A uniform metal ball (mass m) is tied to the end of a string (massless, length L). The other end of the string is fixed. The ball is moving in a vertical circle centered at the fixed end of the string. Suppose the velocity of the ball at the lowest point is v, what is the ...
Tuesday, May 3, 2016 by Chan

science
4 gm of N aOH are present in 0.1dm3 solution have specific gravity 1.038 gm/ml. calculate: a. Molality of N aOH solution; b. Molarity of N aOH solution.
Tuesday, May 3, 2016 by rohan

Science - Northern technical college
An electric train starting from rest is uniformly accelerated in a distance of 40m to a velocity of 10m/s, for this journey. (I).Calculate the time taken by the train. (II). The acceleration of the train.
Tuesday, May 3, 2016 by Lucky chembe

Science
In a heat engine, if 700 J of heat enters the system, and the piston does 400 J of work, what is the final internal (thermal) energy of the system if the initial energy is 1,200 J?
Monday, May 2, 2016 by Ivan

Computer science
Which is the most popular international cable standard? What are the main Differences between attenuation and Crosstalk? Describe different types of connector used in LAN? What are the port number / socket number and Connection Multiplexing? What is difference between Half-...
Monday, May 2, 2016 by Poohboi23

Science - Please Check
Suppose that the local temperature changes in favor of greater oxygen levels in the water. Write a short paragraph to describe how both the population of the small fish species and wading bird population would change in response to the new oxygen levels over the next six ...
Monday, May 2, 2016 by Scarlet

Science
18. What is the difference between nearsightedness and farsightedness? ((Is that just for regular sight, or is there another term I'm not recognizing?)) ((LINKS FOR ALL THE QUESTIONS BELOW, PLEASE!)) 19. Describe how an electromagnet works and give an example. 20. In the ...
Monday, May 2, 2016 by M&M's

Science Help
If the input voltage from the transformer in Figure 23-1 is 32 V, what is the output voltage? ((Input is 4 turns of wire, output is 60 turns of wire.))
Monday, May 2, 2016 by M&M's

Science
which two conditions are required for cloud formation? A) high humidity and warm temperatures. B) high humidity and cool temperatures. C) warm temperatures and the presence of particles. D) cool temperatures and the presence of particles. Is there a link I can find that ...
Monday, May 2, 2016 by Tim

Science Check Answer
1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted materials. C) A ...
Monday, May 2, 2016 by Tim

Science
1. Which of the following is the correct definition of minerals? A) A naturally occurring, inorganic solid that has a crystal shape and definite chemical composition. B) A naturally occurring, inorganic solid that forms through crystallization of melted materials. C) A ...
Monday, May 2, 2016 by Tim

Science
A body of mass 10kg is acted upon by a constant force 20N for 3secs. Calculate the K.E gained by the body.
Monday, May 2, 2016 by Chinyere

Science
1. What happens immediately before a volcano erupts? A) Magma collects in the mantle. B) Lava hardens to form volcanic rock. C) Expanding gases push magma through the pipe. D) The temperature in the magma chamber decreases. Is the answer C?
Monday, May 2, 2016 by Tim

Science
Six ways that the human rights violations influence individuals,groups and the broader south african community
Monday, May 2, 2016 by Nompumelelo

science
A Football is thrown by a quarterback to a receiver. When the quarterback throws it, the ball is at the height of 6 feet above the ground. When the receiver catches it, he is 30 yards away from the quarterback and the ball is again at a height of 6 feet above the ground. The ...
Monday, May 2, 2016 by Sampson

Science test review
Here are all the word you can use I need help chemical property mixture heat capasity homogeneous viscosity sublimitation physical property compound chemical formula substance density mass tempurature pressure heterogenerous 14. A property of matter describes its ability to ...
Monday, May 2, 2016 by jj

science
kendra was looking at recipes in a cookbook. she divided some of the steps of a recipe into two columns. How would you label each column? A.) Column A shows sublimation; column B shows vaporization B.) Column A shows vaporization; column B shows sublimation C.) Column A shows ...
Monday, May 2, 2016 by jj

science
how do liquid water, ice, and water vapor differ from one another? A.) They are different states of matter B.) They are different compounds C.) They are made of different kinds of molecules. D.) They are mad of different kinds of atoms.
Monday, May 2, 2016 by jj

Science
James drops a marble. It accelerates downward at a rate of mc005-1.jpg. After 3.00 s, how fast is the marble moving downward?
Monday, May 2, 2016 by Hanny

Earth science
What is an example of a stable system? How were you able to determine whether or not this system is stable? Please don't attach files, my parents do not allow me to click on any attached files!
Monday, May 2, 2016 by Please help!!!!!!!

Science
A girl lifts her 30-kg (294 N) knapsack a vertical distance of 0.50 m and then she carries it 10 m across the park to the water fountain. How much work is done by the girl? Please help me.
Monday, May 2, 2016 by Hanny

science
a constant force applied at an angle of 20 above the horizonal , pulls a 200 kg block, over a distance of 3 m, on a rough, horizontal floor. the coefficient of kinetic friction is 0.2 show that work done by the kinetic frictional force on the block can be written as Wfk = ( -...
Monday, May 2, 2016 by Anonymous

Science
What is an example of a stable system? How were you able to determine whether or not this system is stable? I really appreciate your help!
Monday, May 2, 2016 by blackbeltninja

Science
In which of these situations is convection most likely the main form of heat transfer? Warm air from a heater on the first floor of a house moves to the upper floors. The sides of a metal pan become hot when the pan is placed on a stove burner. A person gets a sunburn from ...
Monday, May 2, 2016 by Anonymous

Science
Reaction time.experiment
Monday, May 2, 2016 by Tracry

Science
A battery is e.m.f 40volts and internal resistance 5 ohms is connected to a resistance of 15 ohms. Calculate The terminal potential difference.
Monday, May 2, 2016 by Ranvieg

science
Thermal energy is caused by motion of? 1. mixing water molecules contained in a beaker 2. molecules in soild liquid and gas phases 3. mixing molecules together 4. molecules that have reached equilibrium the density of an object with the volume of 60.0 mL and a mass f 400.0 g ...
Monday, May 2, 2016 by jj

Science
If a ball A moves at X speed eastwards collideds with a stationary ball B. Ball A now moves at Y speed north east (40 degrees upwards from eastward direction) and ball B moves at W speed south east (50 degrees downwards from eastward direction). To calculate their kinetic ...
Monday, May 2, 2016 by Loli

science
What is anything that has mass and takes up space? 1) Weight 2) Volume 3) Density 4) Matter When you measure the boiling point of mercury, you are investigating a ____. 1) Chemical change 2) Chemical property 3) Physical change 4) Physical property An object weighing 90 N has ...
Monday, May 2, 2016 by jai

science
Felipe made a toy boat out of clay, but it kept sinking in water. He changed the boat's design by making it slightly wider than before. Why did Felipe's newly designed boat float on water? A. He decreased the density by increasing the volume. B. He decreased the ...
Monday, May 2, 2016 by jai

Science
In a expiriment to determine whether moment is conserved. You shoot a dart into a cart. You know both the mass of the dart and the distance between them. You also know the distance after the dart and cart joined together. The speed can be calculated both before and after the ...
Monday, May 2, 2016 by Spaz

science
A 0.1 M NaOH solution is used for holder 50, or ml of a 0.100 M solution of acetic acid. Calculate the pH of the solution after the addition of 50.0 ml of sodium hydroxide
Monday, May 2, 2016 by Anonymous

political science
Which of the following is NOT a component of judicial review? The supremacy of local laws when they conflict with national laws or treaties. The power of the courts to declare national laws invalid if they violate the Constitution The supremacy of national laws or treaties ...
Sunday, May 1, 2016 by ryan

political science
On the spectrum of international ideologies, what group is most likely to oppose other nations monitoring human rights conditions in the U.S., and favor national tariffs, import quotes, and government subsidies to national businesses? International Communitarians International...
Sunday, May 1, 2016 by ryan

science
Calculate the pH of a solution of ammonium acetate (CH3COONH4) 0,85M knowing that for NH3 Kb = 1,79x10-5 and CH3COOH Ka = 1,76x10-5 and commented on the result obtained. Then calculate the percentage of acetic acid product at equilibrium
Sunday, May 1, 2016 by frankscience

science
Calculate how many grams of NaOH must be added to 75.0 ml of H2SO4 1,000m to get a tampon that has pH = 1,920
Sunday, May 1, 2016 by frankscience

6th Grade Science - Connections Academy
Asexual reproduction is common in _____. A. Mammals. B. Frogs. C. Fertilization. D. Bacteria.
Saturday, April 30, 2016 by Geek Girl

science
A truck travelling down the hill at constent acceleration. If it teavell 300m in 15s calculate it acceleration
Friday, April 29, 2016 by akki

Science - Chemistry
1. Dalton's idea that atoms cannot be divided into smaller parts was disproved by the discovery of the ____. 2. The description of the structure of the atom is called the ___. 3. In a water molecule, two atoms of hydrogen and one atom of oxygen share electrons. A _____ ...
Friday, April 29, 2016 by Hunter

Science Check answers
2) What phenomenon naturally warms Earth's lower atmosphere and surface? • the formation of sunspots • changes in the shape of Earth's orbit • global warming (MY ANSWER) • the greenhouse effect 3) Which of the following is an example of human impact...
Friday, April 29, 2016 by Jessica

Science
Compare a desert ecosystem and forest ecosystem.
Friday, April 29, 2016 by Isaac

Science
Please chrck my answer! How does a galvanometer use a magnetic field to indicate the strength of an electric current? When a current is passed through a magnetic field, it goes through a coil and to a galvanometer.
Friday, April 29, 2016 by Mara

Science
Please help?!? In figure 20-1, where is the field of each charge the strongest? The picture shows A. A postive charge with arrows facing out and B. A negative charge with the arrows pointing in. This is a short answer question, but I don't understand what kind of answer ...
Friday, April 29, 2016 by Kenzie

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