Science

Recent Questions

science
light that has a frequency of 1.5 x 1015 Hz.

Science
How is energy in a ecosystem replenished?

science
An iron cylinder with radius 1.0 cm and length 25 cm has one end held at 250°C and the other at 20°C. Find the heat-flow rate through the cylinder

science
Phosphorus in the soil comes from ?

science
in this experiment, 3 sets of plants were grown. one set had no light, one set had some light, one set had full sun. each set was given the same amount of water, the same temperature, the same soil and it was the same plant and same pot. in 21 days this is the amount of growth...

science- physics
A position vector with magnitude 40 m points to the right and up. Its x-component is 32 m . What is the value of its y-component?

science
Both carbon dioxide and water are pure substances. How are they similar to each other? A. both substances have a set ratio of atoms that cannot be separated by physical means B. both substances have a set ratio of atoms that can be separated by physical means C. both separated...

Science
1. Which of the following traits is acquired? A. The number of petals that grow in a plants flower B. the wing shape of a wild bird C. The ability of some gorillas to learn sign language** D. A cheeta’s ability to run faster than any other land animal 2. The height of a ...

science
body parts found in two or more similar species ______ help scientists from theorists about evolutionary relationships plz help

science
Describe the two most important events in the history of animal life that occurred at the beginning and at the end of the Paleozoic era. (2 pts) List and briefly outline the six different periods into which the Paleozoic era is divided.

science(bio)
Why did dinosaurs evolve so much earlier than humans?

science- physics
Find the x- and y-components of the vector d⃗ = (6.0 km , 31 ∘ left of +y-axis). I worked it out and got 5.14, 3.09 and apparently it's wrong, I don't know what I did wrong.

Science
consider a solid cylindrical disk rotating on an axis through its center. If the angular momentum of the disk increases, what can you conclude?

materials science
An isotropic epoxy resin (E=2GPa, ν=0.3) is reinforced by unidirectional glass fibers (Eglass=70GPa), aligned in the 2 direction, such that the fiber composite is transversely isotropic, with the 1-3 plane being the plane of isotropy. The elastic constants of the fiber ...

science
an isotropic epoxy resin (E=2GPa, ν=0.3) is reinforced by unidirectional glass fibers (Eglass=70GPa), aligned in the 2 direction, such that the fiber composite is transversely isotropic, with the 1-3 plane being the plane of isotropy. The elastic constants of the fiber ...

Mechanic Science
A motorcycle starts from rest with constant acceleration of 1.5m/s^2 until it achieves velocity of 15m/s. The motorcycle decelerate until it stop 12s. Determine: 1) the deceleration of motorcycle 2) distance traveled by the motorcycle

science
The process in which an animal’s cells use oxygen and digested food molecules to release the energy in food is called a. Breathing b. cellular respiration c. diffusion d. gas exchange

Physical Science
A 15 g bullet is fired with a velocity of 200m/s from a 6kg rifle. What is the recoil velocity of the rifle?

HELP SCIENCE ASAP
How are fish, amphibians, reptiles, and birds alike? How are they different? Include at least two similarities and two differences.

science
What advantage would a backbone give to an animal that lives underwater?

Science- RE-DO
1. White skin (W) is dominant over yellow skin (w) in chickens. Which of the following genotypes would result in a white-skinned chicken that could possibly have yellow-skinned offspring? A. WW B. Ww** C. ww 2. Which of the following describes the genotype and phenotype of ...

Science
1. White skin (W) is dominant over yellow skin (w) in chickens. Which of the following genotypes would result in a white-skinned chicken that could possibly have yellow-skinned offspring? A. WW B. Ww** C. ww 2. Which of the following describes the genotype and phenotype of ...

Science
Hello! I had a question about variations in animals, also known as genetic variations. What is a variation? I cannot find an example or a sturdy definition anywhere. Could someone give me an example of variation in animals? Thank you!

science
What advantage would a backbone give to an animal that lives underwater? Thank you

Science
Which letter arrows point to hanging valleys? Which letter arrows point to aretes? Name a peak on the map that is a horn. Feature E on the map is composed of glacial till. What type of glacial feature is E, and how did it form? Explain how turquoise lake formed? file:///C:/...

science
Which of the following explains the relationship between genes and chromosomes. a) Chromosomes come in diffrent versions called genes. b) genes come in diffrent structures called chromosomes. c) Chromosomes are structures that are made up of two versions called genes. d) genes...

Science
Ms. Sue PLEASE check my answers! 1. Which of the following is not part of the theory of evolution? a. Organisms tend to produce more offspring than can survive to reproductive age. b. Organisms can acquire changes during their lifetime that can help their species survive. c. ...

Science
What cannot be separated into simpler substances by physical or mechanical methods such as filtering boiling or shifting

Science
1.)Ovaries contain A.)Sperms & produce estrogen B.) Sperms & produce testosterone C.)Eggs & produce estrogen D.)Eggs & produce testosterone 2.)The testes produce A.)Sperm & estrogen B.)Sperm & testosterone C.)Eggs & estrogen D.)Eggs & testosterone 3.)After an egg is fertilized...

Science
which of the following features make earth and venus similar to each other ? (1point ) A . their size and mass b. their rates of rotation c. their atmospheres d. their directions of rotation****

Science
1) Which of the following statements about the sun's structure is true? The sun has a solid surface The sun has an interior and an atmosphere The sun's interior is similar to the Earth's; it has a core, mantle, and crust*** The sun's outermost layer is called the radiation ...

Science
The half life of Uranium-238 against alpha decay is 4.5*10^9 years.Calculate the number of disintegrations taking place in 1gm of the substance.

Science
The half life of radium is 3.82 days.In what time will the activity decay to 1/16 of its original value.

science
An object moving in a straight line at a constant velocity of 2m/s accelerates at 3m/s2 for 4s . what's the displacement of the object ?

Science
1. A pea plant with yellow seeds is crossed with a pea plant with green seeds. All of the offspring have yellow seeds. The allele for yellow seeds is A. dominant because all of the offspring has yellow seeds** B. recessive because all of the offspring has yellow seeds C. ...

science
one side of a cube of an unknown metal measures 0.53cm. If the mass of the cube is 0.92g, what is the density of the cube?

Science
a(n) ____ occurs during the design process when one benefit is given is given up in order to obtain another thanks

Science
What were five accomplishments of marie curie?

Science
I have several questions 4: The image above shows particles in a medium. Which of the following shows the best conditions for a sound wave to travel? a, b, c, d----My answer is C 12. Which letter shows the type of wave that can be seen by the human eye? a. b. c. d----my answer...

science
Suppose a scientist found a new fossil that indicated it was a primitive mammal. Relative dating techniques place the age of this fossil at a much earlier time than mammals were thought to exist. What effect will this finding have on understanding of the history of life? a. ...

Science
1.)The sporophyte generation produces spores that grow into a A.)Gametophyte B.)Gymnosperm C.)Angiosperm D.)Pupa 2.)Placental mammals develop A.)In leg an egg laid in water B.)In a pouch on the mother's body C.)Inside the mother's body D.)Inside an amniotic egg 3.)Angiosperms ...

Science
How to high-tides change? How do Low-tides change? I would figure it would be the moon and sun, but I want other people's answers. (I thank all who answer)

science
1. which of the following must occur for speciation to take place? a. a population must be physically separated into groups b. harsh environmental conditions must be imposed on a population c. competition must occur between members of a populations d. some event must occur ...

science
A dolphin swimming in seawater at a temperature of 25degree Celsius emits a sound directed toward the bottom of the ocean 150 meters below. what period of time passes befor it hears an echo?

Science
What two words do these letters spell that relates to laboratory work? aaeerrdddugictlysn

science (BIO)
Assume that two pigments, red and blue, mix to give the normal purple color of petunia petal. Separate biochemical pathways synthesize the two pigments, as shown in the top two rows of the accompanying diagram. "White" refers to compounds that are not pigments. (Total lack of ...

science
will a 19.2 bock float in water? i need help please!

Science
A gene is to a chromosome as.... a) a pea is to a pod b) a front is to a back c) a bike is to a car d) a building is to a window

Science
1.)Seahorse change color & swim together in predetermined ways before mating. these behaviors are called? A.)Asexual reproduction B.)Sexual Reproduction C.)Courtship Rituals D.)Budding 2.)A male peacock displays his colorful tail feathers in order to A.)Increase the success ...

science
1. which of the following must occur for speciation to take place? a. a population must be physically separated into groups b. harsh environmental conditions must be imposed on a population c. competition must occur between members of a populations d. some event must occur ...

Science
What is the difference between isobars and isotherm?? Thanks!!

Math in Science
Estimate the thickness of plant matter that produced a bed of coal 0.6 m thick. About how much coal would have been produced from a layer of plant matter 0.50 m thick.

science
WHAT MEASUREMENTS BEST DESCRIBES THE RESULTS OF A SCIENTIFIC EXPERIMENT REGARDING DISTANCE?

science
1. which of the following is not part of theory of evolution. a. organisms end to produce more offspring than can survive to reproductive age. b. organisms can acquire changes during their lifetime.*** c. organisms that do not survive to reproduce do not pass on their traits d...

science
1.a population of snails on an island is disrupted during a violent storm. portions of the population are carried by the storm surge to two new islands, while a portion remains on the original island creating three separate populations. conditions on one of the new island are ...

Science
What is the 5% rule for y-intercepts?

science
which of the following characteristics would you look for a piece of sandstone

Science
1. Which component of the technological system is achieved when an automobile airbag inflates? A. Input B. feedback C. process D. output I think the answer is D. Output. Possibly C. Process. Please help. It will be greatly appreciated. Thank you for your time!!!

science
Two converging lenses are separated by 50 cm, and have focal lengths of f1 = 20 cm and f2 = 10 cm, as illustrated in Figure 2. An object is placed on the left of Lens 1. The final image formed by the two lenses is located at 26.0 cm to the right of Lens 1. (a) Determine the ...

Science
CaCo3 _____ CaO+CO 2 From this eqn caculate the amount of Carbon dioxide in grams liberated by heating 25g of calcium carbonate ?

Eligugu high school science
5 kg of steel is immersed in water at 2 degrees Celsius. what mass of water is required if the final temperature is 40 degrees Celsius?

Eligugu high school physical science
A cannon with a mass of 10 tons fires a bullet horizontally with a mass of 50kg. The velocity of the bullet when it leaves the barrel of the cannon is 800 m / s. calculate the recoil velocity of the cannon.

Tourism Life Science History Maths Literacy
I'm doing this subject but in the mean time I want to go to Collage and right now I don't know what to choose time is running out becouse I'm in Grade Eleven

science
How to cal. The range of π+arcsin(3x-4x^3).give the whole solution step wise

science
calculate the ratio of momentrum when (a) velocity of an object is doubled (b) mass of an object is halved (c) both mass and velocity are increased by three times

science
23g of salt is dissolved in 100g of water at 23 k. what is the concentrarion of solution at this temperarure.

science
to find the height of a bridge over a river. a stone is dropped freely in the river from the bridge.the stone takes 2s to touch the water surface of the river. calculate the height of the bridge from the water surface (g=9.8 m/s

science
why does (second ) square occurs in the unit of acceleration

science
what is the mometum of a mass 75 kg when he moves with a velocity of 2m/s

science
combination of which two tissue. is responcible for movement in humans

Science
If 5gm KClO3 is decomposed to form KCl and O2. What is the percentage yield of reaction if 1.25 gm of O2 is produced??

Science
I need some help, this is fairly confusing to me. ______ Allows traits favorable for survival to be passed from parents to offspring. I could not find the answer to this in my textbook, any help?

physical science
Approximately how long would it take a radio signal to reach the International Space Station (ISS) at an orbital altitude of 350km?

science
What would you estimate to be the speed of a galaxy located 60 million light-years away?

Agriculture,life science,maths literacy,geography
After finishing matric ,will i qualify to be lawyer,geologist,IT,police or teacher?

science
A rope is stretched between two boats at rest. A sailor in the first boat pulls the rope with a constant force of 100 N. First boat with the sailor has a mass of 250 kg whereas the mass of second boat is double of this mass. If the initial distance between the boats was 30 m, ...

Physical science
Help tires rated for 60,000 miles and tread depth of 3/8" Hoe do I estimate how much tread is worn off for every mile driven?

Science
According to the law of conservation of mass, what should the product side of this single replacement reaction look like ? A. H2 ZnCl2 B. H2 + Zn + Cl2 C. H2 + ZnCl2 D. Zncl2

Science
How do binomial or 2 part names compare with early versions of scientific names? shorter longer descriptive in English my answer is descriptive

Science
What is the total displacement of two trips one 10km north and the other 24km east

Science
The relative age of a rock is ? 1. its age based on how much carbon-14 it contains 2. its age compared with the ages of other rocks 3. less than the age of the fossils it contains 4. the number of years since it formed my answer is D

Science
which of the following is an example of a chemical change? A)Iron changes when heated B)Gas bubbles form in boiling water C) Balls of wax form when melted wax is poured into ice water. D)A gas forms when vinegar and baking soda are mixed My Choice D

Science
I am writing a mock biotechnology research proposal for class and I don't know what I should make this research plan about. What are some of the most breaking scientific news, or diseases and issues in this field(biology preferred, or chemistry) that are currently having an ...

Math,Science,Algebra,Geography
Beryl Really Likes taking care of all the details needed to finish up a project. Her Belbin Team Role is? A.)Computers/Finisher B.)Resource/Investigate C.)Sharper D.)Plant

science
1.the modern atomic model includes orbiting the nucleus. which of the following parts of dalton's was disproved by the discovery of the electron atoms are tiny particles atoms cannot be divided into smaller parts atoms have specific mass and size atoms have specific chemical ...

Math,Science,Algebra,geography
The 3 Letter code that summaries your 3 strongest career types is called your? A.)Holland-Code B.)Myers-Briggs Type C.)Teamwork Profile D.)Beblin Code

Math,Science,Algebra,Geography
the personality type theory that gives people codes based on their levels of four traits, including sensing-intuition or making of thinking-feeling is called the? A.)Holland Code B.)Myers-briggs C.)Beblin Roles D.)Team Work Profiles

Science
The spin of an object on its own axis is called

science
What is the rarest element?

chemsitry
home / study / questions and answers / science / chemistry / make sure to answer both parts: 1)balance the following ... Your question has been posted. We'll notify you when a Chegg Expert has answered. Post another question. . Question Edit question make sure to answer both ...

ap chemistry
home / study / questions and answers / science / chemistry / balance the following example of a heterogeneous ... Your question has been answered! Rate it below. Let us know if you got a helpful answer. . Question Balance the following example of a heterogeneous equilibrium ...

science
what is the half-life of the nuclide

Science please check my answer
Which of the following fossil types is best described as forming when minerals replace all or part of an organism's body? A) A mold B) A petrified fossil*** C) A cast D) A trace fossil

Science
What has the study of fossils allowed scientists to do? A) Describe the past environments and the history of life. B) Study present ocean temperatures at different depths C) Analyze the chemical compositions of sedimentary rocks and minerals. *** D) Predict which organisms ...

Science
Please help: 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 underwater volcanoes. She thinks the ...

Science 1 question
A researcher, studying dolphins in the wild, made the following sketch. Each dot on the map represents one dolphin. The area surveyed by the scientist was 1 km ^2. Based on the researcher's data, how many dolphins would you estimate to be in a 3 km ^2 area? 3 7 14 21 SORRY! ...

Science
Hydrogen gas(H2) and chlorine gas (CL2) react to form hydrocloric acid (HCL). What is the correct balanced chemical equation for this reaction? A-2H2+2CL2->HCL B-H2+CL2->2HCL C-2H2+CL2->2HCL D-H2+CL2->HCL I think C Pls Help me

science
a satellite in force free space sweeps stationary interplanetary dust at a rate of dM/dt=alpha v, where M is mass and v is speed of satellite and alpha is a constant. the tangential acceleration of satellite

Science
Many stems hold leaves high. Higher leaves are more likely to get sunlight. How is this helpful to a plant? I don't understand

Physics
I am in 8th Grade G/T Science, and I had a question in an online test I didn't understand: An object is traveling at 8.1 m/s. Over the course of 5.3 seconds, it accelerates at a rate of 2.8 m/s2. What is its final velocity (in m/s)? Can you please help me answer this question...

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