Science

Recent Questions

physical science
two forces act on an object f1 = 5N f2 = 7N when will the resultant force be maximum?

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 ...

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?

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?

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?

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 ...

science
The time units used by scientists to divide Earth's history are part of the

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?

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

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...

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...

Life science
Darwin and charles theory on leaves of many desert plants are reduce to thorns

science
victoria discovered a new way to keep her hands warm on a cold day. what scientific attitude is this an example

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 for ...

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

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

physical science
what is the density of a cube with mass 50g & volume 2cm x 2cm x 2cm?

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..

science
can you please help me find 3 good science experiment? for the science fair....

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

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.

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

Science
Calculate the number of (a) atoms in 50 dm^3 nitrogen gas (b)nucleons in 10 cm^3 fluorine gas

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 ...

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.

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?

science
In the space is there any aliens?

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 ...

Science
Can someone please help me on my science?? I'm kinda new here. Thanks :)

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)

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...

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.

Science
What is the formula used for finding the gravitational pull of a particular mass in physics?

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...

physical science (chemistry)
calculate the number of atoms in 50 dm3 nitrogen gas

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

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

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.

science(biology)
state three secondary functions of roots,stems and leaves

history, life science, cat, maths lit
What career path can I follow with these subjects?

history, life science, cat, maths lit
What career path can I follow with these subjects?

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?

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 evidence...

Science
Is the unit of measurement for a particle beam FLUX - the femtobarn ??? Thanks

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.

science (chemistry)
filter paper is a poor material on which to powder a solid before introducing it into a melting tube .explain why?

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?

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

science
what do sporangia, cone and flowers have in common? how do they differ?

science help
where are the science helpers is this a connection for math help only

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

science
What do sporangia, cones, and flowers have in common? How do they differ?

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 ...

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

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

Science
What is Biological adaptation. Please explain in plain words.

physical science
calculate the number of molecules in 30g water

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 ...

science
What are the six types of simple machines?

science
Why will foot print stay on the moon forever?

science
Which is the biggest flower of all?

Science
Why carbon brushes is used in machinary, while carbon z a non metal?

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?

life science
why these fossils important discoveries?

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...

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 the ...

Environmental Science
H.B.D. Kettlewell observed that peppered moths in the forests of England were becoming darker in color over time. In addition, he observed that pollution had turned the tree trunks black. He thought it would be easy for birds to spot and capture light-colored moths resting on ...

Science
Imagine that you are part of a research team that is working to control the spread of the Japanese beetle. This is an insect pest from Japan first discovered on the east coast of the United States in 1916. Since that time it has been spreading slowly south and west. The grubs ...

Psyc, statistics
Introduction to Hypothesis Testing In an article entitled “Science and ethics in conducting, analyzing, and reporting psychological research” in the journal Psychological Science (1994), psychologist Robert Rosenthal examines the relationship between a researcher’s ...

Life Science, Geography, BSTD's and Mathematics
im in GRADE10, im doing those subjects: maths, lyf science, geog and bstd's. So I need help about which job i can get for doing those subjects?

science
how to measure length accurately using meter scale?

SCIENCE
A 1.5 kg book on top a shelf has a PE (Potential Energy) of 29.4 J. How high is the shelf?

SCIENCE
A 1.5 kg book on top a shelf has a PE of 29.4 J. How high is the shelf?

science
doing a biology project and they want us to figure out how long it takes to cook 6 different foods at 5 different temperatures and gather 30 separate data points. They want us to identify an x(independent) and a y(dependent) variable that can be recorded on a table. Would x be...

HELPPP
I printed out a summer activite to test my skill on science and i found some that i stumbled upon and couldn't figuire out so help? If im wrong then please correct me. 2.A 3.B 4.B 5.A 6.B 2.Giraffes have long necks that allow them to eat leaves in trees. What is this an ...

Science(check answers)
I printed out a summer activite to test my skill on science and i found some that i stumbled upon and couldn't figuire out so help? If im wrong then please correct me. 2.A 3.B 4.B 5.A 6.B 2.Giraffes have long necks that allow them to eat leaves in trees. What is this an ...

science (physics)
A projectileis given an initial velocity of icap + 2jcap . The catesian equation of its path

science (physics)
A projectileis given an initial velocity of icap + 2jcap . The catesian equation of its path

science
1.) what energy transformation are taking place when a ball is dropped from 1.0 m, bounces and tries to 0.80 m, bounces again and rises to 0.64m? What is the efficiency of the energy transformations of ball during a bounce?

Science (Physics)
Two resistors 3ohms and 6ohms are connected in parallel across a 6V battery, what is the current flow through the 3ohms resistors? Just the formula please.

Science
3 resistors having the same resistance value are wired in parallel, how does the equivalent resistance compare to the resistance value of a single resistor? 1) The equivalent resistance is thrice the value of a single resistor. 2) The equivalent resistance is the same as the ...

earth science
The greenhouse effect is a result of A. absorption and radiation of energy in the atmosphere. B. consumption and radiation of energy in the atmosphere. C. absorption and radiation of energy in the hydrosphere. D. consumption of fruits and vegetables that produce a biofuel. i ...

statistics
The trends in international mathematic and science study (TIMSS) in 2007 examined eighth grade proficiency in math and science. The mean mathematics scale score for the sample of eighth grade students in the US was 508.5 with a standard error of 2.83. Construct a 95% ...

science
Calculate the buoyant force in air on a kilogram of gold (whose density is about 19 grams per cubic centimeter). The density of air is 1.3 ✕ 10-3 grams per cubic centimeter. Remember that the buoyant force is equal to the weight of a volume of air that is equal to the ...

agriculture,maths literacy,life science,geography
which career im going to enter in with?

science
Consider a rotating platform such as you used in lab. Imagine that it is initially rotating at some angular velocity. You drop a disk, that is not rotating, onto the top of the rotating platform so that it sticks to the rotating platform and begins rotating along with the ...

science
a mixture of gases contains 64g of methane, 64g of oxygen and 64g of sulphur dioxide. The pressure of the mixture is 210 kpa. what is the partial pressure (in kpa) of the methane expected to be?

science
forces of 20N to the south,40N to the northeast, and 10N to be east act on the object.the magnitude of resultant force is a)10N b)39 N c)20 N d)46 N

science
The mass of an object is 217.5g and its volume is 192mL. What is the density of the object?

life science
1.why are fossils important discoveries? 2. Why are fossils kept in a glass box in the museum? 3.What feature does australopithecus sediba share with humans? 4.What feature does australopithecus sediba share with apes? 5.Explain the scientific interpretation of the fossils ...

Science/Physics
Andee has a mass of 68.5 kg on earth. What is his weight on Earth? What should his mass be in order to have the same weight at the surface of the moon?

science
The greenhouse effect is caused by the burning of fossil fuels and deforestation

Science
Adam suffers from severe emphysema. Gas exchange in his lungs is not adequate, and he requires supplemental oxygen. But even though his blood carbon dioxide levels are elevated, his blood pH is close to normal. Considering the urinary system, explain how this can occur.

Science
A researcher is studying the rate of chemical reactions within living blood cells. When placing the cells into a petri dish with a pH of 2.5, the researcher should predict that the rate of the reactions will A. increase immediately. B. decrease immediately. C. remain the same...

maths lit,life science,economics,history
what career must i follow

science
two point charges of 5 micro culomb and 20 micro culomb are separated by a distance of 2m find the point on the line joining them at which electric field intensity is zero

Science
In pea plants, the allele for tall (T) is dominant to the allele for short (t). Which of the following is the percent of offspring that will be tall if a heterozygous plant (Tt) is crossed with a homozygous tall plant? A. 100% B. 75% c. 50% D. 25% B?

Science summer activity help
I saw a site that had fun summer activites and my mom said each one I pass I get 5 dollars so I want to check my answers. 1.B 3.D 4.A 5.D 1.how do scientists explain the great diversity of life on earth? different characteristics help __ A. young organisms find their parents B...

Science
. A researcher wants to develop a new pharmaceutical compound to treat pain. Which of the following strategies will likely be the most effective process? A. Test extracts from newly discovered plants for pain-killing substances. B. Read anthropological studies to discover ...

Science
While picking up passengers in a big city, a taxi driver drives 20.0 blocks south, then 15.0 blocks east, and then 6.0 more blocks south. What is the magnitude of the taxi’s resultant displacement? Iv'e been using the equation sqrt(x^2+y^2+z^2) THe answer I get is 25.7, ...

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