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October 2, 2014

Homework Help: Science

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Recent Science Questions

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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

Science
which of the following are impacts that the temperature climate has had on Georgia's development? A) encouraging crops with longer growing season B)Drawing immigrants from other locations C)encouraging tourism D)all of the above
Wednesday, August 20, 2014 at 10:45am

Science
A piece of magnesium ribbon weight 24g is burn in air an 40g magnesium oxide is formed. What mass of oxygen combined with the magnesium in this reaction
Wednesday, August 20, 2014 at 8:32am

physical science
what is the density of a cube with mass 50g & volume 2cm x 2cm x 2cm?
Wednesday, August 20, 2014 at 4:08am

Physical Science
I'm having trouble with the question: Critique the phrase "airspeed velocity of a swallow." What is meant by this. I know a swallow is a bird and velocity is the speed of an object and the direction of its motion. Not sure the question is asking. Thanks..
Tuesday, August 19, 2014 at 7:22pm

science
can you please help me find 3 good science experiment? for the science fair....
Tuesday, August 19, 2014 at 6:04pm

Science
Could you make sure I'm correct? What is true of the work of all scientists? scientists ask testable questions and devise ways to answer those questions through experimentation or observation
Tuesday, August 19, 2014 at 5:52pm

science
you have a ball of steel and a ball of iron both of the same volume. The ball of of steel has a larger mass. Is it denser, less dense, or does it have the same density as the ball of iron. Explain.
Tuesday, August 19, 2014 at 4:53pm

Physical science
Calculate the volume(at STP) Of these compounds (a) 1,5 mol oxygen gas (b) 0,01 mol of hydrogen chloride gas (c) 3 mol helium
Tuesday, August 19, 2014 at 2:40pm

Science
Calculate the number of (a) atoms in 50 dm^3 nitrogen gas (b)nucleons in 10 cm^3 fluorine gas
Tuesday, August 19, 2014 at 2:26pm

Science
Justin wants to be the captain of an aircraft carrier when he gets out of school. Which subjects should Justin study to help him prepare for his career? A.biomedical science and meteorology B.oceanography and paleontology C.chemistry and biology D.physics and computer science ...
Tuesday, August 19, 2014 at 2:08pm

science
you have a ball of steel and a ball of iron both of the same volume. The ball of of steel has a larger mass. Is it denser, less dense, or does it have the same density as the ball of iron. Explain.
Tuesday, August 19, 2014 at 2:04pm

Science
Which branches of science do pharmacists need knowledge of to do their job properly? A.physics and chemistry B.biology and chemistry C.chemistry and geology D.physics and computer science Is the answer B?
Tuesday, August 19, 2014 at 1:59pm

science
In the space is there any aliens?
Tuesday, August 19, 2014 at 9:55am

Science
Your younger brother who wishes to be a pilot reads a news article about a search and rescue plane. In this search and rescue operation, an ultra-light aircraft travelling north at 30 km/hr encounters a 40 km/hr crosswind. After explaining to him that a crosswind is wind that ...
Tuesday, August 19, 2014 at 9:45am

Science
Can someone please help me on my science?? I'm kinda new here. Thanks :)
Tuesday, August 19, 2014 at 9:05am

Science
In general, what would a scientist do after forming a testable question? A. Design an experiment B. Develop a hypothesis C. Draw a conclusion D. Analyze data (I think B. is that the right answer)
Tuesday, August 19, 2014 at 8:54am

Science
A science teacher was curious to see whether offering money for good grades would increase student peformance on a test. The teacher offered half of the students in the class $5.00 if they got an A on their next test. The other half of the class was not offered any money. What...
Tuesday, August 19, 2014 at 8:52am

science
If it takes more than a few experiments to find the answer to a particular problem, it means that the scientist has failed and is not a very good researcher.
Tuesday, August 19, 2014 at 8:18am

Science
What is the formula used for finding the gravitational pull of a particular mass in physics?
Monday, August 18, 2014 at 10:55pm

Environmental Science
Answer the questions about the following processes in the space provided below. You only need to indicate a process by its number. For each question list as many processes as apply. Process 1: 6 CO2 + 6 H2O → C6H12O6 + 6 O2 Process 2: C6H12O6 + 6 O2 → H2O + 6 CO2...
Monday, August 18, 2014 at 7:06pm

physical science (chemistry)
calculate the number of atoms in 50 dm3 nitrogen gas
Monday, August 18, 2014 at 4:35pm

life science
why do desert plants have thorns instead of leaves ?Explain the answer according to theories of Charles Darwin and Jean Baptiste de Lamarck
Monday, August 18, 2014 at 12:42pm

Science
A car weighing 15,000N rounds a curve of 60m at an angle of 30 degrees. Find the friction force acting on the tires when the car is travelling at 100kph. The coefficient of friction between tires and the road is 0.90
Monday, August 18, 2014 at 3:54am

dav science
a machine gun fires 25 g bullets at the rate of 600 bullets per minute with a speed of 200 m/s. calculate the force required to keep the gun in position.
Sunday, August 17, 2014 at 9:52pm

science(biology)
state three secondary functions of roots,stems and leaves
Sunday, August 17, 2014 at 6:32pm

history, life science, cat, maths lit
What career path can I follow with these subjects?
Sunday, August 17, 2014 at 1:46pm

history, life science, cat, maths lit
What career path can I follow with these subjects?
Sunday, August 17, 2014 at 8:32am

science cbse school
a force of 10 newton gives a mass m1 an acceleration of 2m/s2 and a mass m2 an acceleration of 4m/s2.what acceleration would it givr if both the masses are tied together?
Sunday, August 17, 2014 at 4:16am

Science
In the early 1900s, Alfred Wegener noticed that some of the Earth's continents looked like they might fit together like a jigsaw puzzle. He also observed that the continents that looked like they fit together had similar plants, animals, and rock formations. From this ...
Friday, August 15, 2014 at 11:29am

Science
Is the unit of measurement for a particle beam FLUX - the femtobarn ??? Thanks
Friday, August 15, 2014 at 7:19am

science
the melting point of pure benzoic acid and pure naphthol are 122.5 and 123 degree Celsius respectively. you are given a pure sample that is known to be either pure benzoic acid or 2- naphthol. describe a procedure you will use to determine the identity of the sample.
Thursday, August 14, 2014 at 6:51pm

science (chemistry)
filter paper is a poor material on which to powder a solid before introducing it into a melting tube .explain why?
Thursday, August 14, 2014 at 6:35pm

Science
The upper layer of the ocean contains an abundance of microorganisms that carry out photosynthesis, such as algae. Why would this make the upper layer rich in oxygen?
Thursday, August 14, 2014 at 4:05pm

fundinjobo high science
a mass of 80 grams of hydrogen gas is heated with nitrogen gas to produce ammonia gas .what is the mass of ammonia that will be produced
Thursday, August 14, 2014 at 12:29pm

science
what do sporangia, cone and flowers have in common? how do they differ?
Wednesday, August 13, 2014 at 8:06pm

science help
where are the science helpers is this a connection for math help only
Wednesday, August 13, 2014 at 4:19pm

Earth Science
A scientific hypothesis can become a theory if? a- the entire scientific community accepts it b- the hypothesis is tested extensively and competing hypothesis are eliminated c- there are no other competing hypothesis d- the hypothesis can be tested at least once My answer is B
Wednesday, August 13, 2014 at 2:49pm

science
What do sporangia, cones, and flowers have in common? How do they differ?
Wednesday, August 13, 2014 at 2:27pm

Science
If a nuclide has a decay constant of 10^-6 s-1 what is its half life ??? I think it is 0.693 / 10^-6 = 693000 or 6.93 x 10^5 Is this right ...
Wednesday, August 13, 2014 at 11:51am

Earth Science
what is the driving force for the movement of the lithospheric plates? a- heat from the sun b- unequal distribution of heat within Earth c- heat in the atmosphere d- unequal distribution of heat from the oceans My answer is B
Tuesday, August 12, 2014 at 1:41pm

math lit, life science, geography and cat
Hi im a Matric learner and would really like to know what careers I could possibly look into with my subjects listed above Thank you
Tuesday, August 12, 2014 at 1:22pm

Science
What is Biological adaptation. Please explain in plain words.
Monday, August 11, 2014 at 1:46pm

physical science
calculate the number of molecules in 30g water
Monday, August 11, 2014 at 10:39am

Science
*Cement is 70% CaO by mass *Concrete is 17% cement by mass *Concrete masses 150lbs. per cubic feet *There are 27 cubic feet in a cubic yard *15 cubic yards required for house of concrete. CaCo3(s)---CaO(s)+CO2(g) 1.) How many kg. of carbon dioxide were liberated to make your ...
Saturday, August 9, 2014 at 10:55pm

science
What are the six types of simple machines?
Saturday, August 9, 2014 at 12:16pm

science
Why will foot print stay on the moon forever?
Saturday, August 9, 2014 at 4:22am

science
Which is the biggest flower of all?
Saturday, August 9, 2014 at 4:18am

Science
Why carbon brushes is used in machinary, while carbon z a non metal?
Saturday, August 9, 2014 at 3:15am

Science
A car converts 1000 J of energy from a sample of fuel. 750 J of heat (thermal energy) is produced by the engine, 150 J of heat is produced in the transmission, drive train, etc., and 100 J of work is done to move the car. How efficient was the process of burning fuel for the car?
Friday, August 8, 2014 at 11:06pm

life science
why these fossils important discoveries?
Friday, August 8, 2014 at 12:09pm

science
I answered this already. Should you multiply the answer in letter b to 2? QUESTION: Phil Younghusband is a sensational striker of the Philippines National Football team Azkals. An avid fan of his claims that Phil can kick the football and give it an initial speed of 50 m/s. If...
Friday, August 8, 2014 at 7:50am

science
Two students perform a simple experiment. One flicks a dime from the edge of a table. At the same instant, the other student drops a quarter from the same height. Ignoring air resistance, which coin strikes the floor first? Explain why. My own answer.. is this right? "in ...
Friday, August 8, 2014 at 7:48am

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