Science

Recent Questions

I NEED HELP! Science
What happens when particles of a material move father apart?

Mathematics, geography, agricultural science, life science, English, Life orientation And sepedi
I'm doing grade 11 but still I don't know what or which kind of job careers that needs these subjects Agricultural science, Geography, life science, mathematics (pure), Sepedi, English, And lastly life orientation..Help me please and appreciation will bless you.

Science
If you began with 36 grams of water how many hydrogen and oxygen can you produce in a decomposition reaction

Earth Science
How does altitude affect climate (beyond just temperature)?

Science
A row of elements on a periodic table is called a(n) A: group *** B: Period C: valence D: orbital Is this right?

computer science
a memory's addressibility is 64 bits what does tell you about the size of the MAR and MDR?

science
a car reduced it's velocity uniformly from 21m/s to14m/s in 10seconds (A) find the retardation (B) the distance cover in this time

History
What is taxonomy? a subgroup of organisms (I also feel like its this one also) the classification of plants based on their medical uses an organisms's evolutionary history the science of classification (my answer)

Check My Answers for Science!
1: Which of the following is the minimum level of structure needed to perform the function of waste removal? A: Body System B: Tissue C: Cell*** D: Organ 2: Which two systems work with the muscular system to allow the body to move? A: Digestive and Urinary systems B: Skeletal ...

Science/Biology
the vessels that contain the largest volume in the vascular system are? I think Arteries

Science
A 20 kg mass slides down an inclined plane which is at an angle of 60 degrees to the horizontal 1. Horizontal component of weight force 2. Vertical component of weight force 3. Angle 4. Normal force 5. Net fx 6. Acceleration along incline I really do not get how to do this, I ...

science
if mass of a body is 8g and volume is 10cm3 what is density

science (physics)
A copper wire with cross sectional area 0.00030cm^2 is to be used in lifting a 100g object.How fast can the object be accelerated if the wire is to stretch not more than 0.10%? What i know is that first find the elongation & then that will help to find acceleration..

science
Physic. You can walk at the average speed of 2.5 m /s. How long will it take to reach your school 1km away?

Science (Physics)
Air becomes a conductor when the electric field strength exceeds 3.00 × 106 N/C. Determine the maximum amount of charge that can be carried by a metal sphere 8.5 m in radius. The value of the Coulomb constant is8.99×109 N·m2/C2. Answer in units of C. I have the equations E=...

Science
A. alleles B. mitosis C. DNA D. phenotype E.chromosome F. codominance G. diploid H. meiosis I. incomplete dominance J. centromere K. reproduce L. RNA 8. Chromosome pairs contain different versions of genes, which are called __________________. (1 point) alleles 9. The process ...

science
Who goes to connections? I would like to get answers to questions from the cyber school that im going to

Science
Air pollution can be controlled by? A. permitting more storm runoff B. burning more coal C. eliminating sewage D. putting scrubbers on power plants I think it is B

science
if A-B=2C,A+B=4C and C=3i+4j, then what are A and B?

Science/biology
A 62 year old man experiences sudden onset of difficulty breathing, followed by double vision, and later by abnormal kidney and liver function tests. Of the following conditions, which is most likely the cause of his problems? A. Vasculitis​​ B. Raynaud's ...

Science
1.) when might preserved remains of an entire organism form? A.) when sediment buries the hard part of an organism B.) when an event such as a quick burial or freezing preserves an entire organism ******* C.) when minerals replace parts of an organism D.) when a thin layer ...

science
nitrogen and hydrogen combined in the ratio 14:3 by mass to form amonia molecule.find the formula of amonia molecule by calculating the molar mass (atomic mass of nitrogen = 144.4).

Science
Lightning is actually van enormous display of the concept of ?

science
Calculate the amount of h2so4 required for preparing 500ml of 2MH2so4 solution.

science
An incident Ray makes 60 degrees angle with the surface of the plane mirror, what is the angle of refraction. Options are...a 60 b 90 c 30 d 0....this is a question in a guide is it correct

science
Which of the following are psychological characteristics that Beatrice Whiting and John Whiting found to crosscut cultural boundaries

SCIENCE
jamal's neighbor tells him that there are more bacterial cells than human cells in his body. which of these is the best reason that jamal should question his neighbors statement? a. jamal is older than his neighbor b. jamal does not like his neighbor very much. c. his neighbor...

Science Help
jamal's neighbor tells him that there are more bacterial cells than human cells in his body. which of these is the best reason that jamal should question his neighbors statement? a. jamal is older than his neighbor b. jamal does not like his neighbor very much. c. his neighbor...

Science /bio
Any foods or fruits highest in glucose?

Science
A coconut of mass 2kg is on a tree of 5m tall; determine the potential energy of this height Take g=10ms^-2.

science
a man has a mass of 80,0 kg is standing on the surface of the earth. a )calculate the magnitude of the attractive force (gravity) that the earth exerts on the man.(784n) b)how does your answer in a) compare to the magnitude of the force that the man exerts on earth? c)use your...

Computer Science/Pseudo Code Python
Hi, I'm confused about an assignment. I'm not sure what to do and would like some help. An example: Write a program that obtains two integer numbers from the user. It will print out the sum of those numbers. Pseudo code: Prompt user to enter first integer number Validate user ...

Science
What is g efeective?elustrate an example.

Science
1. How does nanotechnology how engineers make products for the future? A. By changing a materials atomic structure, it can be made from elements that are easier to obtain. B. By changing a materials atomic structure, it's physical properties can also be changed. C. By changing...

Science - Ms. Sue plz
Which structures on the ocean floor are equivalent to mountains on land? Thanks.

SCIENCE
a body at rest is given an innital uniform acceleration of 8.0m/s-2 for 30s,acceleration reduce to 5.0m/s-2 for d next twenty sec.body mentains speed ten for 60s after brought to rest in 20s draw in graph 1.using d graph to calculate 2.maximum speed attain in motion 3.total ...

science
How can i prepare a 100ml, 0.1M phosphate buffer solution (pH = 7) out of Na2HPO4 and NaH2PO4

Science
How many grams of sodium hydroxide are needed to react with 50 grams of phosphoric acid?

Chemistry
I have to summarize 10 articles relating to the topics we had covered in class. However, there are 3 sources out of the 10 that I don't understand. Could someone possibly go through the sources and summarize them. 1.) This article covers Nuclear Chemistry (Nuclear Reactors) to...

Science HELP PLS
how are earth and venus similar? how is venus different from earth? provide two similarities and two differences

science
An electric lamp rated at 48w,12-v supply. Calculate the current flowing in the lamp and the resistance

Science( please help)
  In a cathode ray tube, the number of electrons that reach the fluorescent screen is controlled by the  A. cathode. B. deflecting plate. C. anode. D. grid. ? The part of the atom that accounts for electricity is the  A. nucleus. B. electron. C. neutron. D. proton. B?

science
a bike weighs 200 n. if it starts from rest and travels 100 m in 5 s undergoing constant acceleration, what net force is causing the acceleration

Science
Jawless fishes and salamanders are alike in that both types of animals A. are amphibians B. have backbones C. have fins D. are smooth skinned organisms B or D

Science
Physical properties of silver carbonate.

Math
Wanda wants to have a test average of 90 her four science tests. On the first three tests, she got scores of 84, 96, and 85. What does she need on her last test to reach her goal?

science help
Which of the following is typically associated with a reduction in photosynthesizing plants in a water supply? An increase in dissolved oxygen A decrease in dissolved oxygen An increase in phosphates A decrease in phosphates is it d

science help PLS
Which of the following is the most likely way for bacteria and viruses to enter a water supply? Increased photosynthesis releases bacteria and viruses Poor sanitation habits cause water to mix with sewage Water from a burst dam sweeps particulate matter into a nearby river ...

science
show that the moment of inertia of a solid cylinder with radius R, mass M, and length L is 1/2(MR^2)

Science
A microwave oven supplies 1.000kj per second.how many min should be set on the microwave in order to heat 250.g of water from 24.3 degrees c to its boiling point?

science
show that the moment of inertia of a uniform rod of length L and mass M about an axis perpendicular to the rod and passing through its center of mass is 1/12(ML^2)

Science
Which of the following would likely be part of an ionic bond? Choose all that apply (2 points) A. K+1 B. Cl2 C. F-1 D. Ne

Science
How many valence electrons does an atom of rubidium have?

science
Two forces whose resultants is 100N are perpendicular to each other. If one of them makes an angle of 60 degree with the horinzontal. Calculate its magnitude

Science
What is the reproduction rate of the bacteria species Vibrio Cholerae?

Science
Johnny left a glass of milk on his bedside table for week, and it spoiled. At the end of the weel, the glass contained a yellow liquid with lumpy white chunks, and there was a terrible odor. What can be concluded? A. The milk has undergone a physical change B. The mass of the ...

life science,mathematics,agricultural,tourism
which study fields I should take?

history,geography,life science,maths literacy
provide three possible financial sources for assistance that you can access for funding your studies and indicate the financial obligations you will have if you choose each of these options

history,geography,life science,maths literacy
what are the admission repuirement for traffic?

history,geography,life science,maths literacy
what is the description of the traffic

history,geography,life science,maths literacy
provide two reasons why you find this a suitable course for each choice

science
how can I prepare 5 micromolar solution of Fe(NO3)3.9H2O? plz guide me as soon as possible

science
A piece of metal has a mass of 120 grams.if its volume is 8 cm3.what is its density?

Science
a ball is rolled off the edge of a dining table 1.5 m high with a horizontal velocity of 2.2 m/s with what velocity does it strike the ground? How far from the edge of the table did it land on the floor?

Science
The height of the tropopause increases near the equator. What does this say about the thickness of the atmosphere?

Science
The ratio of Secondary Turns to Primary In a Transformer is 3 if the EMF In the Secondary Coil Is 600Volts Find The EMF Of Primary

science
how does high speed space travel affect time?

science
what is the scientific name of the big dipper?

science
Ammonium nitrate breaks down into Dinitrogen monoxide and dihydrogen monoxide

Science Please Help!
Some constellations, such as Ursa Minor, are visible in the sky year-round; other constellations appear for only part of the year. Explain why this happens. I've been trying to figure it out but I can't please help me!

Science
Which reaction is exothermic? A. Cellular respiration B. Photosynthesis C. Baking soda + vinegar D. Melting Ice***

Science!
1) Which of the following is true about photosynthesis? A. it is an exothermic reaction B. it is an endothermic reaction C. It produces carbon dioxide D. it occurs in animals I think it's A.

science
What dose a wildlife corridor help prevent? 1. habitat fragmentation 2.habitat loss 3.habitat competition 4.habitat creation I choose (2) is this correct?

Science
a fireman 50 m away from a burning building directs a stream of water from a ground-level fire hose at an angle of 30 degrees above the horizontal. If the speed of the stream is 40m/s , at what height will the stream of water strike the building?

Science
About what percent of all of Earth's fresh water is found in ground water, streams, lakes, and rivers?

maths and science
Three courses or study field you are interested in following after grade 12 and provide three reasons

science
Ann is driving down a street at 50 km/h. suddenly a child runs into the street. if it takes ann .75 seconds to react and apply the brakes. how many meters will ann have moved before she begins to slow down? If she slows down at a rate of 1.5m/s^2, how long will it take her to ...

life science ,cat,maths lit and english
What can i become with maths lit ,cat,life science and geography

Science
4.)When two or more atoms of the same of the same element are in a chemical bond, the substance is called a(n)________ A.)Compound B.)Molecule C.)Nucleus D.)Particle*** Am I'm correct? BUT My mom disagree's and says C?, isn't she wrong?

Science
2.)Which of the following are pure substances? A.)Chocolate Milk B.)Orange Juice C.)Sea Water*** D.)Hydrogen Peroxide (H2O2) C?

science
A cylinder contains a moles of hydrogen at 0 degree celsius and 76cmHg.calculate the amount of heat require to raise the temperature of hudrogen to 50 degree celcius.keeping the pressure constant and what is the volume of hydrogen when at 0 degree celsius.

Science
Physics question -A driver of a car travelling at 72km/h, applying brakes and accelerates uniformly in opposite direction at the rate of 5m/s2. How long will the car take to come into rest ? How far will the car covered a distance after applying bra

science help
A scientific question should be vague creative non-testable non-repeating

science help
A scientific question should be vague creative non-testable non-repeating is it b

science help
A scientist uses a computer model to understand a widely accepted theory about Earth's surface. The computer model would most likely help the scientist to... A. reduce the intensity of earthquakes B. discover new facts about the theory C. stop the creation of faults during ...

science help
Four groups of students, in different parts of the world, are investigating the reason why the shape of the moon changes from time to time. If the results of their investigations are considered valid, they would most likely be A) complex B) identical C) non-testable D) ...

science help check
Which of these is an example of an experiment? plant growth is affected by temperature leaves may change color due to temperature add different quantities of water to three potted plants the plant which gets the most sunlight grows the fastest is it c

Science
Calculate the amount of heat required to completely convert 1kg of water at 0°C to the boiling point at 100°C?

science help
A scientist plans to find out the percent of teenagers who like science. She interviews 500 teenagers leaving a science museum and finds that 450 of them like science. The scientist concludes that 90 percent of teenagers like science. Why is the scientist's conclusion most ...

science help
Which of these questions can be answered through science? What is the best water sport? Why should we value honesty? Why does water change into steam? What is the most important thing in life? is it c

science
A cylinder contains a moles of hydrogen at 0 degree celsius and 76cmHg.calculate the amount of heat require to raise the temperature of hudrogen to 50 degree celcius.keeping the pressure constant and what is the volume of hydrogen when at 0 degree celsius.

science
P +HNO3 gives HPO3 + NO Balance the chemical equation by oxidation no. method

math literacy,life science ,history ,design
What career can I choose with these subjects

life science
Biological term for: the presence of definite upper and lower surfaces in animals

English
1. He is a social science teacher. 2. He is a SS teacher. 3. She is a home economics teacher. 4. She is a HE teacher. 5. She is a technical arts and homemaking teacher. 6. She is a TAH teacher. 7. She is a healthe education teacher. 8. She is a HE teacher. 9. He is a technical...

Science
A rope is used to host an object with a mass of 1,3 tons vertically through a distance of 100m. The mass of the rope is 2kg per metre. Determine: the work done.the average tension in the rope and the power used if it takes 2minutes to host the object.

Science
Why is UTC used for astronomical calculations?

science
what is the balanced product of Pb(NO3)2 + Li(SO4)?

science
What is the pH of a mixture of 5ml of 0.1mol/litre sodium acetate and 4ml of 0.1mol/litre acetic acid? pKa= 4.76.... What is the pH on adding 1ml of 0?1mol/litre HCl to the mixture abouc

Science
Mohan travels at 20m/s from home and returns back at 25m/s.Find his average velocity for the entire journey?

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