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December 17, 2014

Homework Help: Science

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Recent Science Questions

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science
a hemisphere container is made with the following dimensions. the external diameter of the container is 12 cm. the internal diameter of the container is 6 cm. it is filled with water to the brim. what is the density of the empty container if the total mass of the container ...
Tuesday, September 2, 2014 at 6:33am

Science Check answers please
I put ** by the ones I thought correct Which of the following statements best describes the characteristics of a hypothesis, one of the steps of the scientific method? a)It is a possible answer to a scientific question *** b) It is a scientific inquiry that cannot be tested c)...
Tuesday, September 2, 2014 at 3:45am

science, physics
Calculate the final temperature. Two kg ice at zerodegree celsius is mixed with 8 kg of water at 20 degree celsius.
Monday, September 1, 2014 at 4:24am

science
A particle leaves the origin with a speed of 2.4 times 106 m/s at 38 degrees to the positive x axis. It moves in a uniform electric field directed along positive y axis. Find Ey such that the particle will cross the x axis at x = 1.5 cm if the particle is an electron.
Sunday, August 31, 2014 at 5:38pm

science
How many calories are in a food that contains .100 grams of CHO . 20 grams of protein . 20 grams of fat What percentage of the total calories comes from: . CHO .Protein .Fat
Sunday, August 31, 2014 at 2:52pm

science
How many calories are in a food that contains .100 grams of CHO . 20 grams of protein . 20 grams of fat
Sunday, August 31, 2014 at 2:48pm

Science(density)
A brick of salt has a volume of 50cm^3 and a mass of 100 grams. What is its density? Show all calculations.
Sunday, August 31, 2014 at 1:29pm

science
derive second equation of motion.S=ut+1/2at2 graphycally where the symbols have their usual meanings.
Sunday, August 31, 2014 at 3:41am

Science
What do you learn in 7th grade science
Sunday, August 31, 2014 at 12:06am

science
Scientists performed an experiment to determine whether there is a connection between learning ability and food. They took two groups of 20 mice each, all from the same purebred strain. The mice were deprived of food for 3 days and then given a standard learning session in ...
Saturday, August 30, 2014 at 10:14pm

science
Compute the density in g/cm3 of a piece of metal that has a mass of 0.345 kg and a volume of 59 cm3
Saturday, August 30, 2014 at 1:32pm

Chemistry Science
calculate the mass of carbon dioxide that would be produced when one gas of tank of gasoline (use octane) is burned in the air. assume an 80 liter gas tank and 0.703 g/ml as the density of octane
Saturday, August 30, 2014 at 12:35pm

Physical Science
How many satellites are used for transmitting GPS signals?
Saturday, August 30, 2014 at 9:38am

Physical Science
The polar circumference of Earth is 40,000km. What distance corresponds to a change of one degree of latitude? A change of one one arcminute of latitude? Hint, an arcminute is 1/60th of a degree.
Saturday, August 30, 2014 at 9:27am

Physical Science
Standard GPS receivers are accurate to about one hundredth of an arcminute of latitude. What distance does this correspond to?
Saturday, August 30, 2014 at 9:23am

Physical Science
If six blocks of wood were cut from the same board , would all the pieces of wood have the same density?
Saturday, August 30, 2014 at 9:19am

Physical Science
Do wood float in gasoline and water?
Saturday, August 30, 2014 at 9:17am

Physical Science
An 84.9 kg man is standing on a frictionless ice surface when he throws a 2.00 kg book at 11.1 m/s. With what velocity does the man move across the ice?
Friday, August 29, 2014 at 8:31pm

Science
Why do scientists use standard units of measurement? A.Because their tools only measure in these units. B.Because other units are either too small or too large to work with. C.So they can communicate findings without confusion. D.So that people who are not scientists cannot ...
Friday, August 29, 2014 at 1:49pm

Physical Science
What is the weight of a 4.82 kg backpack in Newton and the acceleration of the backpack if a net force of 10.0 N is applied in m/s2?
Friday, August 29, 2014 at 12:15pm

Science
A.) A runner is jogging at a steady 6.7 km/hr. When the runner is 3 km from the finish line, a bird begins flying from the runner to the finish line at 20.1 km/hr (3 times as fast as the runner). When the bird reaches the finish line, it turns around and flies back to the ...
Thursday, August 28, 2014 at 11:13pm

science
why ch3cn act as both electrophile and nucleophile?
Thursday, August 28, 2014 at 9:54pm

science
The chef has 50 pounds of strip loin. The trim loss on the strip loin is 60% and the cooking loss is 20% of the trimmed weight. How many pounds of trimmed, cooked strip loin will the chef have left to serve to his customers?
Thursday, August 28, 2014 at 7:51pm

Science
A star's life depends on mass ___ mass=Long life Large mass= ____ life Small mass is long life and large mass is short life?
Thursday, August 28, 2014 at 7:21pm

science
When a test charge q0 = 9 nC is placed at the origin, it experiences a force of 8 times 10-4 N in the positive y direction. (c) If this force is due to a charge on the y axis at y = 3 cm, what is the value of that charge? so in a I found E to be 88888.889 in b I found the F on...
Thursday, August 28, 2014 at 5:13pm

science
how do you calculate the missing variable in work and power;example:you must exert a force of 4.5N on a book to slide it across a table .if you do 2.7J of work in the process,how far haveyou moved the book
Thursday, August 28, 2014 at 5:12pm

Science
Having scientic literacy involves being able to? A. ask scientific qustions. B. evaluate scientic information. C. understand scientific terms. D. all the above. i think C.
Thursday, August 28, 2014 at 4:40pm

science
A particle beam is made up of many protons each with a kinetic energy of 3.25times 10-15J. A proton has a mass of 1.673times 10-27kg and a charge of +1.602times 10-19C. What is the magnitude of a uniform electric field that will stop these protons in a distance of 2 m? I am ...
Thursday, August 28, 2014 at 4:01pm

Science in motion pHY 102
Find the net force produced by a 30-N force and a 20-N force in each of these cases: (a) Both forces act in the same direction. The net force produced by 30-N force is 60-N The net force produced by 20-N force is 40=N Applied Forces Net Forces 30-N = 60-N 30-N
Thursday, August 28, 2014 at 3:43pm

Science
Which of the following best describes a scientific theory? A.A scientific theory is a rule of nature that can never be changed. B.A scientific theory is an educatrd guess about the possible results of an experiment. C.A scientific theory is a description of a pattern of ...
Thursday, August 28, 2014 at 2:10pm

Science
An environmental group claims that a local chemical plant is polluting a nearby river. They are calling for a shutdown of the chemical plant. What evidence would help you the most in evaluating their claim? A.A repeated study that shows chemicals produces by the plant are in ...
Thursday, August 28, 2014 at 1:53pm

science
Which of the following is a valid reason to study science? A.All employers require an in-depth knowledge of sience. B.Carrying out scientific experiments is a requirement of everday life. C.Most colleges require advanced science classes. D.Understanding basic scientific terms ...
Thursday, August 28, 2014 at 1:39pm

Science
help fastwhich of the following statements incorrectly describes a tool used by scientists? A. A compound light microscope enables a scientist to view objects too unaided eye to see. (B).A beaker is a type of glassware a scientist uses in the lab to record data. C. A scale is ...
Thursday, August 28, 2014 at 10:59am

science
_______ describes all the processes associated with the discharge of magma, hot fluids, ash, and gases.
Thursday, August 28, 2014 at 10:49am

science
116In nuclei are produced at the rate of 10 s-1. Calculate the maximum number of 116In nuclei (number in equilibrium) in the sample if the half-life of 116In is 54 m. So far I have come up with ... The half life = 54m x 60 s-1 = 3.24 x 103 s-1 (In2) / λ = In2 / 3.24 x 10^...
Thursday, August 28, 2014 at 10:40am

Science
which of the following statements incorrectly describes a tool used by scientists? A. A compound light microscope enables a scientist to view objects too unaided eye to see. (B).A beaker is a type of glassware a scientist uses in the lab to record data. C. A scale is used to ...
Thursday, August 28, 2014 at 10:31am

Science
which statement best describes the benefit of having a universal system of measurement? A. Scientists from different counties can more easily shared and compare data from experiment. B. Scientists who speak difference languages do not have to translate each others work into ...
Thursday, August 28, 2014 at 10:18am

Science
which statement best describes the benefit of having a universal system of measurement? A. Scientists from different counties can more easily shared and compare data from experiment. B. Scientists who speak difference languages do not have to translate each others work into ...
Thursday, August 28, 2014 at 9:03am

science
Mary is driving on a straight road. Suddenly a deer jumps out in front of her. Mary turns her car to the left to avoid the deer. Which best describes what happens to mary's head position if she is wearing her seatbelt? A) mary's head moves to the left b marys head ...
Wednesday, August 27, 2014 at 9:02pm

7th grade Science
Can you help me figure out the manipulated , responding, & controlled variables in the following? Walker wanted to test how weight of a paper airplane affected the distance the airplane flew. he stood at the starting line and threw the airplane. He measured how far the paper ...
Wednesday, August 27, 2014 at 7:57pm

Science
What are legs when using them to push a heavy weight?
Wednesday, August 27, 2014 at 4:25pm

Science
which statement best describes the benefit of having a universal system of measurement? A. Scientists from different counties can more easily shared and compare data from experiment. B. Scientists who speak difference languages do not have to translate each others work into ...
Wednesday, August 27, 2014 at 9:29am

Science
which of the following describes scientific inquiry?(1 point) A.a statement that describes what scientists expect to happen in experiment. B.facts,figtures,and other evidence gathered through observation. (C).the diverse ways in which scientists study the natural world. D.a ...
Wednesday, August 27, 2014 at 8:57am

Science
which of the following describes scientific inquiry?(1 point) A.a statement that describes what scientists expect to happen in experiment. B.facts,figtures,and other evidence gathered through observation. (C).the diverse ways in which scientists study the natural world. D.a ...
Wednesday, August 27, 2014 at 7:58am

Math, Science, Sociology, Economics
Math: What is the answer to 1146(150+X)+8911(743+19X) Science: What is photosynthesis? Sociology: What is figuration and functionalism? Economics: What is Opportunity cost? Why is it relevant to life?
Wednesday, August 27, 2014 at 2:14am

Science
If an experiment disproves a scientists hypothesis, what should the scientist do next? A. develop a testable question B. revise the hypothesis and try the experiment again. C. develop a theory based on the data gathered in the experiment D. change the dependent variable. Is ...
Tuesday, August 26, 2014 at 4:55pm

Science
Which of the following is not a model? A. an ant farm B. a bicycle C. an atlas D. a plastic human skeleton I think B is the answer am I correct?
Tuesday, August 26, 2014 at 3:38pm

Science
Turning on the switch in a flashlight starts a chemical reaction in the batteries. The chemical energy is turned to light energy and the flashlight lights up. Which part of this system is an example of a process? A. Turning on the switch is a process. B. The conversation of ...
Tuesday, August 26, 2014 at 3:37pm

Science
1. How is a model of an atom different from a real atom? A. A model of an atom is not as big as an actual atom. B. A model of an atom is the same as a real atom. C. A model of an atom is more complex than a real atom. D. A model of an atom is not as small as an actual atom. I ...
Tuesday, August 26, 2014 at 3:33pm

English
Identify the word that best describes the bolded word. The interviewer REMAINED speechless upon hearing about the senator's revelations. A.) linking verb********* B.) action verb C.) auxiliary verb D.) transitive verb FEW people know about the complex science behind the ...
Tuesday, August 26, 2014 at 3:13pm

Science
Which of the following identifies a measurement, its SI unit, and the tool most commonly used to measure it? a) lenght, meter, ruler b) temperature, degrees fahrenheit, thermometer c) weight, gram, scale d) volume, milimeter, meiscus The answer I chose was d. Am I right?
Tuesday, August 26, 2014 at 12:51pm

Physical Science
Does wood float in gasoline?
Monday, August 25, 2014 at 11:42pm

science
100.0g of 4.0c water is heated until its temperature is 37c. if the specific heat of water is 4.18 j/g c, calculate the amount of heat energy needed to cause this rise in temperature.
Monday, August 25, 2014 at 10:49pm

Physical Science
Write the number represented by 0.9^1900 with both 5 and 1 significant figures.
Monday, August 25, 2014 at 9:51pm

science
Baby chickens require a constant source of food. As chickens grow, more energy is needed for daily activities. Number of days 0, 1,2,3,4,5,6,7 and food eaten (grams) 0.0, 1.5,3.5,6.5,9.0,12.5,16.5,21.0 What type of graph will you use?
Monday, August 25, 2014 at 8:22pm

Science
4. The graph above shows jack's mass over a five-month period. Based on the trend in the data, what do you predict will happen to jack's mass the subsequent month? A. Jack's mass will increase(MY ANSWER) B. Jack's mass will decrease C. It is impossible to ...
Monday, August 25, 2014 at 5:23pm

Physical Science
A planner estimates that a project will take 3.0 years to complete. Write the corresponding number of days with the appropriate number of significant figures (one year is 365.25 days long).
Monday, August 25, 2014 at 5:06pm

Physical Science
If one measurement is known much more precisely than the other, the fractional error is the ratio of the absolute value of the difference (|M1-M2|), and the more accurate value. What is the percentage error of student A's measurement (37.2 cm long if it is determined by ...
Monday, August 25, 2014 at 5:02pm

physicsal science
Write the number represented by 0.9^19 with both 5 and 1 significant figures.
Monday, August 25, 2014 at 4:43pm

Physical Science
If student A measures a laptop computer to be 37.2 cm long, and student B measures 36.7 cm, what is the percentage error?
Monday, August 25, 2014 at 3:26pm

science
Suppose you were balancing a chemical equation that contained the substance sodium nitrate, NaNO3, composed of a sodium ion, Na+1, and a nitrate ion, (NO3)-1. Could you change any of these numbers in order to balance the equation?
Monday, August 25, 2014 at 2:16pm

earth science
The process to convert seawater into fresh water is known as
Monday, August 25, 2014 at 1:36pm

science
why does not refraction occurs on mirrors ????? means in mirror reflection occurs not refracton why??????
Monday, August 25, 2014 at 4:38am

Science
An electric bulb is rated 220v-100w.the power consumed by it when operated on 110v will be
Sunday, August 24, 2014 at 11:22pm

Physical Science
Is jelly a element, compound, or a mixture? Is sweet tea a element, compound or a mixture? Is ketchup a element, compound, or a mixture?
Sunday, August 24, 2014 at 5:08pm

Physical Science
How is a compound different from an element?
Sunday, August 24, 2014 at 4:38pm

Earth Science
Please help me with the following question: 8. Observations can lead to hypotheses. Hypotheses can lead to new experimentation. Which best describes an observation and hypothesis that might lead to new experimentation? A. Dr. Sattler discovers a new plant that grows near ...
Sunday, August 24, 2014 at 4:21pm

computer science
Writing a c++ program that stores the following values in five different variables:28,32,37,24,and 33.We have been ask to get the average of the series of values given above. Here I what I got /// This program calculates the sum and average of a series of values #include<...
Sunday, August 24, 2014 at 3:01am

Phsical Science
Other than familiarity, what is the advantage of the English System of measurement?
Saturday, August 23, 2014 at 11:35pm

Physical Science
The standard unit of length in the metric system is based on what.
Saturday, August 23, 2014 at 11:30pm

Physical Science
A loaf of bread (volume 3200 cm3) with a density of 0.50 g/cm3 is crushed in the bottom of the grocery bag into a volume of 2400 cm3. What is the density of the mashed bread in g/cm3
Saturday, August 23, 2014 at 11:12pm

science
how would a piece of pure silver decrease in density but still be the same temperature? please tell me if that can or cant happen? thx! :)
Saturday, August 23, 2014 at 7:08pm

Earth Science Continued
Please help me with the following questions: 1. John Dalton said that the total pressure (Pt) exerted by a mixture of gases in a container is equal to the sum of the individual pressures of each gas present (if each gas was the only one present in the container). Further ...
Saturday, August 23, 2014 at 4:19pm

science
you have pure silver in your hand and its 10.5 g/cm^3 at 20 degrees celsius. you get handed pure silver thats 9.9g/cm^3 and its also at 20 degrees celsius. what happened?
Saturday, August 23, 2014 at 12:25am

Physical science
What did svante arrhenius discover about the reaction between an Acid and a Base?
Friday, August 22, 2014 at 5:21pm

Science
How might creativity help a scientist? a)creativity allows a scientist's findings to be trusted. b)Creativity alllows a scientist to develop new ideas or evaluate old ideas in a new way. c)Creativity assures that the scientist has a sense of right and wrong. d)creativity ...
Friday, August 22, 2014 at 2:53pm

science
the hydrogen ion concentration in a mixture of 10ml 0.1 M H2SO4 AND 10ml 0.1M KOH solution in water is?
Friday, August 22, 2014 at 2:40pm

Science
What type of scientific thinking did alfred wegener employ to develop his theory? A.Inductive reasoning B.Deductive reasoning C.Skeptical reasoning D.Subjective reasoning Is the answer A?
Friday, August 22, 2014 at 2:37pm

Science
How might creativity help a scientist? A.Creativity allows a scientist's findings to be trusted. B.Creativity allows a scientist to develop new ideas or evaluate old ideas in a new way. C.Creativity assures that the scientist has a sense id right and wrong. D.Creativity ...
Friday, August 22, 2014 at 2:09pm

ENGLISH
In what year was this article published? In what year was the film Minority Report set? What gaming console does the article mention? Why does the article mention this gaming console? What is the “Star Trek effect,” and how does it relate to what you have learned ...
Friday, August 22, 2014 at 12:22pm

waverley girls high school
Which career options do you have if you choose subjects such as geography, maths literacy, business studies and life science ?
Friday, August 22, 2014 at 12:11pm

Science
An air balloon is at rest in the air and a stone is dropped from it. It passes a 81m tower in quarter of a second and comes on the ground. Find the final velocity and the height of the air balloon.
Friday, August 22, 2014 at 9:57am

science
an electron in a one-dimensional box undergoes a transition from the n=3 level to the n=6 level by absorbing a photon of wave length 500 nm. what is the width of the box?
Friday, August 22, 2014 at 4:10am

science
what is 50g divided by 8cm3
Friday, August 22, 2014 at 3:21am

science & math
for a ray of light incident normally on one face of the prism prace course of the ray measure the delta angle explain briefly do this for prism with angleA=60,45,90
Thursday, August 21, 2014 at 10:34pm

Earth Science Continued
Please help me with the following questions: 1. A scientist suspected that the increase in the acidity of ocean water could have a devastating effect on organisms such as snails because it could break down calcium carbonate, a chemical that makes up their shells. Which could ...
Thursday, August 21, 2014 at 7:13pm

physical science
two forces act on an object f1 = 5N f2 = 7N when will the resultant force be maximum?
Thursday, August 21, 2014 at 4:17pm

Earth Science
Please help me with the following questions: 1. A scientist suspected that the increase in the acidity of ocean water could have a devastating effect on organisms such as snails because it could break down calcium carbonate, a chemical that makes up their shells. Which could ...
Thursday, August 21, 2014 at 3:25pm

science
If each resistor in a diagram is 95 Ù. What is the total current in the circuit if it is connected to a 120 V power supply?
Thursday, August 21, 2014 at 1:39pm

General Physical Science
A fishtank with inside dimensions of 65 cm X 45 cm X 80 cm is filled with water. What is the volume in cm3 of water required? What is the mass in grams of the water required? What is the mass in kilograms?
Thursday, August 21, 2014 at 1:22pm

physical science
A car travels in a northward direction for a total distance of 512 km. The car completes this trip in 6 hrs. After resting the driver makes the return trip, the return trip only takes 5.5 hours. What is the average speed of the car over the entire trip?
Thursday, August 21, 2014 at 1:21pm

Science
A chemist notes that a solution turns blue when a chemical reaction takes place. Which of the following correctly describes the chemist's data? A.The data is a qualitative observation B.The data is a quantitative observation C.The data is a prediction D.The data is a ...
Thursday, August 21, 2014 at 12:13pm

science
The time units used by scientists to divide Earth's history are part of the
Thursday, August 21, 2014 at 11:48am

Math
Dominic collects sports science fiction and history books. He has 21 books about sports, 35 books about science fiction, and 14 about history. He wants the same number of each type of book on each shelf. What is the greatest number of each type of book on each shelf?
Wednesday, August 20, 2014 at 10:27pm

7th grade Math/Science
Can you help me with this science question: from sea level, the biosphere goes up about 9km and down about 19km. What is the thickness of the biosphere in meters? (there wasn't a formula in the workbook). Thanks
Wednesday, August 20, 2014 at 10:14pm

physical science
need help understanding how to do this problem. "A swimmer swims a half lap, moving from the left end to the right end of a pool that is 50 meters long. What is the distance and what is the displacement? Thanks...
Wednesday, August 20, 2014 at 8:48pm

physical science
On the question...a runner completes exactly 2 laps around a 400 meter track...what is the distance and what is the displacement? Would it be...800m for distance and 0m for displacement? Thanks...
Wednesday, August 20, 2014 at 8:30pm

Life science
Darwin and charles theory on leaves of many desert plants are reduce to thorns
Wednesday, August 20, 2014 at 3:57pm

science
victoria discovered a new way to keep her hands warm on a cold day. what scientific attitude is this an example
Wednesday, August 20, 2014 at 1:27pm

Science
4)What geographic feature marks the last obstacle for Georgia's rivers on their way to the Atlantic Ocean? A)The Floridian Aquifer B)The valley and ridge region C)the Fall Line D)the Marshes of Glynn 7)Which northern Georgia region has relied predominantly on coal mining ...
Wednesday, August 20, 2014 at 12:10pm

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