Science

Recent Questions

Science
Why are there so many different species on earth today?

English
Help, Please! I don't quite understand what is asking in this assignment (Essay) Task: Write an essay that compares Frankenstein and his creation to a modern zombie story with the focus on how a monster might be used as a metaphor for science or scientific advances and/or how ...

Science
A 2 N and 6 N force pull on an object to the right and a 4 N force pulls to the left a o 5 kg object. what is the net force on the object?

psych
What is the Importance of Research in Behavioral Science?

English
Help, Please! I don't quite understand what is asking in this assignment (Essay) Task: Write an essay that compares Frankenstein and his creation to a modern zombie story with the focus on how a monster might be used as a metaphor for science or scientific advances and/or how ...

physical science
a crate of cooldrinks with a mass of 15kg over a smooth horizontal surface by exerting a force of 80N at 30° to the horizontal. Draw a diagram and aswers the following 1. Draw a force diagram showing and labelling all the forces acting on the crate. 2. Calculate the vertical ...

Earth Science
Why are there so many different species on Earth today?

science
This type of auto-immune disease occurs when the immune system attacks the layer of insulation that surrounds the nerves and slows nerve impulses.

science
a 2,8kg trolley is moving to the right with a speed of 0,45m.s^-1. A 1.9kg brick is dropped from rest and lands on the trolley. the trolley and bRick move together across the horizontal surface. Assume an isolated system. determine the change in momentum of the trolley

science
In the diagram above, the arrows represent momentum. A larger arrow indicates more momentum. Which of the following best describes how the balls will move after ball A collides with ball B? (1 point) 1. Ball A will bounce off of ball B and roll to the left, and ball B will ...

science/bioligy
How would a scientist use DNA or protein sequences from three different organisms to construct a cladogram? need help!!! how do I do this??

science/biology (cladogram)
How would a scientist use DNA or protein sequences from three different organisms to construct a cladogram? don't understand this how do I write this???? help!!!!

engineering science
A solid cylinder rolls from rest down an incline 6m high without slipping. calculate the linear velocity at the foot of the plane

science
How can I prepare a acid with a specific concentration and volume. Example how can I prepare o.5M of HCl

6th Grade Science
In the ____ temperatures can increase up to 1,700˚C.

accelerated science
what is the energy level of visible light, infrared, and radio waves in joules?

science
Why is fresh water considered a limited resource?

Science
In pea plants, yellow seeds are dominant over green seeds. Round peas are dominant over wrinkled peas. Cross two pea plants that are heyerozygous for both traits.

Science
A plane flies 118 km at 15 degrees south of east and then flies 118 km at 35 degrees west of north. Find the magnitude and direction of the total displacement of the plane?

Physical science
a balloon has a volume of 0.5 L at 20 degrees celsius. what will the volume be if the balloon heated to 150 degrees celsius? assume constant pressure and mass. I got 0.7218 L.

SCIENCE PLZ HELP
when are tides in earths oceans the highest? during the moons waning gibbous phase during the moons waxing gibbous phase when the moon is at the right angle of the sun when the sun, Earth, and moon are in a line.

science
which term describes the main process in the water cycle

science
why is water a limited rescource

science
when whould electric current flow through a conductor

Science
If a cell undergoes mitosis every six hours, how many cells will there be in all after seven days?

Science
Expression for bernaulli theorem

science
Express the value of time in s.I units 2hours 35 seconds I tried multiplying but gave me wrong answers and objectives are 7200 3600 9300 2100

Science
What impact does storage of elastic energy have on the efficiency of hopping?

Science
There is generally more life found in the sunlit part of the ocean closer to the continents than there is in the open sea farther from the continents. Therefore, the open sea is sometimes called the blue dessert. Why is this? Thanks.

Science - Characteristics of the Ocean Floor
If you could drop Mt. Everest (height:8848m) to the bottom of an ocean trench, would its summit(top) reach the level of the ocean's abyssal plains? Why or why not? Thanks.

Science - Ms. Sue plz
Would you expect to find plant like organisms below 1,000 meters in the ocean? Why or why not? Thanks.

PHYSICAL SCIENCE
Imagine two billiard balls on a pool table. Ball A has a mass of 2 kilograms and ball B has a mass of 3 kilograms. The initial velocity of ball A is 9 meters per second to the right, and the initial velocity of the ball B is 6 meters per second to the left. The final velocity ...

Science
If you could drop Mt. Everest (height: 8848meters) to the bottom of an ocean trench, would its summit (top) reach the level of the ocean's abyssal plains? Please help me with this question. Thanks. :D

Science
I need an example or suggestion for a Controlled Experiment for a science presentation

Science
Are plant like organisms below 1,000 meters in the ocean? Thanks.

Science
A stone wirelesd at the rope 30cm long makes 10 complete revolution in 25 second

computer science
Assume a computer has the capacity to hold up to 4 memory modules, with each module containing 512M bytes. How many total bits are needed in the memory address?

science
950ml of a gas at pressure of 1.5atm is compressed to 473ml. what is the new pressure of the gas

science
freezing point of pure solvent remains constant whereas the freezing point of a solution continues to decrease with time

Science
Al+(Cr2O7)2- = Al3+ + Cr3+ [al3+]=0.01M [(cr2o7)2-]= 0.1M [cr3+]=0.001M find the E cell if we add Naoh to each electrode until al(oh)3 precipitates pH=8 KPT of al(oh)3=5 * 10 -33 Eal=-1.66 V Ecr=1.33V

general science
A car mass 500 kg accelerates 1m/s sqare the force due to eng is 600N the average frictional force is

Earth science
Why didn't the early geologic time scale include the number of years ago that events happened?

Science
The half-life of randon-222 is 8 days. What was the original mass if 6 grams remains after 24 days?

Physical Science
Suppose the jumbo jet of mass 30000 kg flies against an air resistance of 82000 N while the thrust of all four engines is 100000 N. Find the acceleration

Science
Actively dividing cells can be found in? meristems. xylem tissue. epidermal tissue. center of stems. phloem tissue. help

science
which kind of reproductive structure is not within the fungi? is it anthers

geography,life science, business and maths lit
What career can I use as an option after my matric??????

Earth Science
why didn't the early geologic time scale include the number of years ago that events happened?

science
why didn't the early geologic time scale include the number of years ago that events happened?

science
Iron is produced in a single displacement reaction with iron II cyanide and tin. How many grams of iron are produced when you use 1.98 g of tin?

Science
Why are sedimentary rocks more useful than metamorphic or igneous rocks in establishing the relative ages of rock?

Math
A science class planted a tree in the school courtyard that was 6 inches tall. It is growing 4 inches each week. Write a function rule for the height, h, of the tree based on the weeks, w, since it was planted. h = 6w + 4. h = 4w + 6. (MY ANSWER) h = 4w. h = 4w – 6.

science
3 Nitroglycerine is used as an explosive. The equation for the explosion reaction is: 4C3H5(NO3)3 ( l ) 12CO2 ( g) 1 10H2O ( l ) 1 6N2 ( g) 1 O2 ( g) a How many moles does the equation show for: i nitroglycerine? ii gas molecules produced? b How many moles of gas molecules are...

science
why echo is weaker than original sound

science
You burn 6 grams of carbon in plenty of air: C ( s) + O2 ( g) = CO2 ( g) a What volume of gas will form (at rtp)? b What volume of oxygen will be used up?

science
Why it is important to know the history of science in 300 words?

Science
Does anyone know the answer to this? 2.50mL Fe =? atoms Fe, Dfe =7.87 g/mL

science
why did a portion of the table top get cold when Natasha placed her cold drink on the table

science
a banana turning brown when exposed to the air is an example of what

science
an ice cube, a glass of cold water, and a swimming pool are each exposed to the same amount of sunlight on a hot day. after five minutes, the ice cube is melted and the cold drink is two degrees warmer, but the temperature of the swimming pool remains unchanged. what is the ...

science
a blank property of matter describes an ability to change into different substances

science
a bananan turning brown when exposed to the air is an example of

science
an ice cube a glass of cold water in a

science
a 54-gram sample of an unknown material has a volume equal to 20cm3 what is the identity of the substance

science
write aprogram and flowchart to read anumber from 1-12 and print the name of the month

Science
Can someone please check my answers? I would greatly appreciate it. Thanks! 1. Which of the following inner planets has virtually no atmosphere? a. Mercury*** b. Venus c. Mars d. Earth 2. Which of the following statements about the inner planets is true? a. They all have rings...

Computer Science
Create a Raptor Flowchart that calculates the amount a person would earn over a period of time if his or her salary were five cents the first day, ten cents the second day, and so on doubling each day. Your program should: 1. Request the number of days. 2. Display a table ...

science
If a ball that is freely falling has attained a velocity of 19.6 m/s after two seconds, what is its velocity five seconds later?

maths and science
A farmer sells eggs in trays.Each tray contains 30 eggs.a shopkeeper sells these eggs in dozens.If a shopkeeper needs 8 dozens a week,how many trays of eggs should he buy from the farmer?

physical science
a head ball of mass 600g is thrown vertically upwards from ground level and reaches the maximum height of 20metres.calculate the initial velocity of the ball

science
What volume of H2 gas, in mL, would be occupied by 0.00465 moles of H2 gas at a temperature of 0 °C and a pressure of 760 mmHg?

MATHS LIT,GEO.HISTRY, LIFE SCIENCE
I DO NOT KNOW WHAT TO CHOOSE IN MY CAREER ?AS I DO THESE SUBJECTS CAN SOMEONE HELP ME WITH MY CAREER!

science
A feather is dropped on the moon from a height of 1.40meters.The acceleration of gravity on the moon is 1.67m/s^2.Determine the time for the feather to fall to the surface of the moon.

science
47.25 L sample of nitrogen is determinedto contain 0.75 mole of nitrogen moles of provided presure remain the same?

science
47.25 L sample of nitrogen is determinedto contain 0.75 mole of nitrogen moles of provided presure remain the same?

science
Hcl is titrated against 5ml of sodium carbonate of strength 0.0133 then what should be the mean value of HCl added ?

Science
What might be the functions of the chemical additives in body washes?

science, chemistry
Calculate the final Volume of solution obtained if 100.0 mL of 12.0 M NaOH is diluted to 5.20M

Science Please Help!!!
Which best describes a cave ecosystem? A) Plentiful food, widely varying temperature B) Plentiful food, constant temperature C) Very little food, widely varying temperature D) Very little food, constant temperature I think it's either C or D....maybe C??? Please help! (=

Earth science
A scientist wants to determine the age of a rock. The rock contains an index fossil and an ancient relative of a living organism. Which is more useful for dating the rock, and why? Answer: an ancient relative of a living organism would be more useful for dating the rock ...

Science
2.)which of the following statements about the solar system's formation is true? a:the temperature was very cold. b:gravity pulled together a cloud of gas and dust. c:objects formed from the same materials. d:the planets formed at the same distance from the sun. B?

Enriched science
What is the goal of synthetic biology? A. The goal of synthetic biology is to mimic living cells B. The goal of Synthetic biology is to generate new tissues to replace damage tissues C. The goal of synthetic biology is to engineer living cells to perform specific functions D. ...

Enriched science
Engineers who are working to find alternative fuel sources hope to A. Reduce air pollution B. Use more fossil fuels C. Design microorganisms that will eat oil D. Increase the yeild of food crops

Enriched science
Which of the following would be an engineering project that could help protect the planet? A. Finding a new landfill site B. Designing a better trash compactor C. Deciding which products can be recycled D. Growing microbes that eat oil

Science
RNA is thought to have proceeded proteins and DNA, why? A. more types of RNA than DNA B. single stranded RNA is less complex than DNA Not sure if either are correct?

Science
Sustained increase in the population that makes up all the trophic levels requires an increase in A. primary producers B. primary herbivores C. primary carnivores D. keystone predators

Science
DNA can copy itself easier than RNA because? A. its a double helix B. polymer of nucleotide C. its confined to nucleus D.its supported by histone proteins I have no idea

Science
chlorine atoms have larger radii than fluorine A. True B. false I am unsure

Science
Genetic Information is found where? A. nuclei B. ribosome I think A

Science
key factor driving cellular differentiation in the body? A. rate of transcription B. cell nutrience C. expression of genetic coding D. chemical gradients in a cell environment I think A

Science
Pepsin is... A. enzyme B. lipid C. carbohydrate D. nucleic acid I think A!

Science
What cell stimulates immune cells to attack? A. Helper T cells B. Cytotoxic T cells

Science
Bond that holds atoms together in a molecule are? A. radiation energy B. kinetic energy C. thermal energy D. potential energy I think B

Science
Lifelong protection after exposure such as the chicken pox is which type of immunity A. Active immunity B. innate immunity I think B

Science
function of smooth ER A. synthesis lipids B. form ribosomes C generate energy D phagocytose bacteria I think A

Science
Which example is an example of natural selection A.prairie dogs build an underground tunnel B. fish omit odor to avoid sea lions C. cats with better nutrition play more D. lizards absorb vitamin D to help digest food. I think B

Science Physics
A rope exerts a 274N force on an 80kg skier up along a hill inclined 12 degrees. A frictional force of 100N opposed the motion. If the skier starts from rest, what is her speed after travelling 100m?

SCIENCE
Indicate how to mix two of the first concentration 3.2 M hydrochloric acid solution and the second to 15% by weight and density 1.30Kg / L to obtain 2.5 L of hydrochloric acid solution in 4.2M concentration

SCIENCE
A nitric acid solution at 25% by weight has a density of 1.21 KG / L Calculate the volume needed to be taken to obtain 2 L of a 2.5 M solution of nitric acid

science
A chain link m/c having a blade of (330x52x6)mm on which steel wire is rotated of 4mm how much torque is reqd for amotor.

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