Science

Recent Questions

Science and maybe re
This isn't really homework, but I thought someone could really help me with this. Did time exist before the Big Bang? I believe in God; if time always existed, why did he make it wait? Looking for a really scientific explanation. Thanks!

Science
A balloon filled with air is taken up a mountain with hiker. What is the pressure exerted on the balloon at sea level?

Science
What is the most popular non-renewable energy source?

Science
Determine the final temperature when 100 g of water absorbs 1000 J of thermal energy, given that the initial temperature of the water is 20.0°C. The theoretical specific heat capacity of water is 4.19 J/g·°C. Show your work below.

7th Grade Science
1. Which of the following statements about continental glacial movement is correct? A. Continental glaciers can only flow uphill. B. Continental glaciers can flow in all directions *** C. Continental glaciers can only flow downhill. D. Continental glaciers do not flow at all. ...

Science
How does friction affect the height that a ball will bounce? Can you give a hypothesis too of what i'll need to do please!? I'm confused

Science
How does friction affect the height that a ball will bounce? Can you give a hypothesis too of what i'll need to do please!? I'm confused

Science- 8th grade- please help!!
1) What evidence is there that the human species has been successful so far? Explain. 2) What environmental pressures in the past do you think were most important in shaping the human species as it exists today? 3) What environmental pressures exist now that you think may be ...

science (theory of evolution)
1.What is two pieces of evidence used to support theory of evolution? Do you guys think it would be alright if I said that they observed nature. And also if you guys could help me come up with another example I would REALLY appreciate it!!

science
when you turn a television on, you transfer electrical energy into __. choose all that apply. a heat energy b light energy c elastic potential energy d sound energy

science
An electric stove transfers heat too a pot by a.) conduction b.) convection c.) radiation d.) friction

Science
Can you give me help understanding this question? A skydiver prepares to jump out of a plane. Explain how gravity and air resistance will affect the motion of the skydiver before and after he or she opens the parachute.

GEN 499
Question 25. 25. <21{8[1(07)95]}> Political science professor: Many people insist that the Internet is revolutionizing the political process. They argue that Internet debates and online political polls and chat rooms give people greater access to political information. ...

Science
what happens immediately before a volcano erupts ? a) magma collects in the mantle** b) lava hardens to form volcanic rock c) expanding gases pushes magma through the pipe d) the temperature in the magma chamber decreases

Science
Okay, so I have been working on this question for about two weeks...craxzy right?! BUt help 1. How does salinity affect the temperature and density of water?

physical science
The force of gravity acting on a body is 675 newtons. find the mass of the body to the nearest kilograms.

physical science
Why is the atmosphere pressure lower on a high mountain peak than at sea level?

science
A patient takes the recommended dosage of painkiller pills, but does not feel any immediate effect. What should the patient do next?

science
the cake is sititing on table with a gravitation force of 57.6 and a normal force of 57.6 what is the sum of all forces

physical science
What is the momentum, in kg-m/s of a 54,000 kg ship going 12 mph?

physical science
How many kilojoules are required to melt 5 lbs of gold if its initial temperature is 1000 K?

Science
How can using biomass fuels instead of gasoline in car engines help conserve natural resources? a. I makes cars run faster. b. It burns more fossil fuels. c. It reduces the use of coal.<---- d. It uses a renewable resource.

science
During a reaction of ca(oh)2 with carbon dioxide gas, 20g of solid caco3 is formed. calculate the mass of the nahco3 needed to produce the amount of carbon dioxide gas responsible for forming the caco3 precipitation.

Science
Name the Pb (NO³)²

science
What is mixture?

Science
1. What type of map would you use to locate the mountain ranges on a continent? idk!

Science (Chemistry)
So all I have to do now is cross multiply and solve for x right? Also when that happens, how do I factor the x^3? What do I do?

Science (Chemistry)
Hello DrBob222 Regarding the answer you gave me thank you very much. However when you expand the denominator, I don't get -0.14 but I get -0.28. I get that because when I first expand I get 0.0049 - 0.14x - 0.14x + 4x^2. So when I simplify that I get -0.28x. So could you ...

Science
1.A weatherman reports, “The storm waves are about 2 meters high and about 35 meters apart.” What properties of waves is the reporter describing? (1 point) A.frequency and wavelength B.wavelength and wave speed C.amplitude and wavelength D.amplitude and frequency 2. ...

science
How would the ecosystem’s carrying capacity for a species change, if the species cannot adapt to changes of habitat?

science
What can happen to an animal species if it cannot adapt to changes taking place in its habitat?

science
Which of the following is the best course of action when it comes to using natural resources? A. Only nonrenewable resources should be carefully managed B. Only renewable resources should be carefully managed C. Conservation should be implemented for both renewable and ...

science
How many joules of heat is required to change 40.0g of ice at 0degrees Celsius to liquid water at 0 degrees Celsius.

science (any tutor)
Which kind of pollution is illustrated by a pipe gushing polluted water into a river? A. Point source*** B. Nonpoint source C. Carbon source D. Resource source

Science (Chemistry)
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...

science
when 8.4 g of NaHCO3 is added to a solution of CH3COOH weighing 20 g .It is observrd that 4.4 g of CO2 is releasd into atmosphere and a residue is left behind .calculate the mass of residue by applying law of conservation of mass .

science
the resultant of two forces 13n and 20 n is f if the first forces is doubled the resultant is also doubled to 2f find the angle betwen the two forces

science
how physical/mechanical and chemical weathering different?

science
how are physical/mechanical and chemical weathering alike?

Science (Chemistry)
A chemical system within a sealed 1 L reaction vessel is described by the following reversible reaction equation: 2H2S(g) <---> 2H(g) + S2(g) If the equilibrium constant is 0.000 004 200 at 1103 K find: (a) the reaction quotient intially (b) the order of concentration of...

Science
Sorry Ms Sue I forgot to separate them A species of flowering plant produces vibrant blue flowers. The flowers attract both pollinators that spread the plant's pollen and herbivores that feed on the plant. An adaptation occurred through several generations of plant species, ...

Science
Can you please help me answer just a couple questions A species of flowering plant produces vibrant blue flowers. The flowers attract both pollinators that spread the plant's pollen and herbivores that feed on the plant. An adaptation occurred through several generations of ...

Science
How could sustainable use preserve biodiversity in hot spots?

Science
During a space shuttle landing, a parachute deploys from the back of the shuttle as it taxis down the runway. In addition to the speed brake, the parachute helps the shuttle come to a complete stop. How does the parachute help during this process? A. It increases the weight of...

science
A bicycle tire is filled with air to a pressure of 6.80 atm and a temperature of 19 degrees Celsius. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58 degrees Celsius. The volume of the tire increases by 4.0%.What is the new pressure in the ...

science (any tutor)
Similarities in the early development of chickens and opossums suggest that these organisms share a________. common ancestor???

science (any tutor)
a farmer sprays insecticide on his crops and notices that the insect pest problems disappear. a year later he tries the same insecticide only to find that he did not achieve the same result. the insect population shows resistance to the insecticide.This is na example of _____ ...

science school
A body of mass 20g appears to have a mass of 13g in oil and 12g in water what is the relative density of oil.

science (any tutor)
Narwhals are aquatic mammals known for the giant tusk that protrudes from their upper lip. These mammals live in artic waters and can spend more than three hours at a time underwater at great depths that would crush other animals. The narwhal's ability to endure such long ...

science (any tutor)
Similarities in the early development of chickens and opossums suggest that these organisms share a________. common ancestor???

science (any tutor)
Very few fossils of jellyfish or their close relatives have been found. This makes it hard to trace the evolutionary history of jellyfish using the fossil record. What explains this? A. Jellyfish fossils are buried deep under the ocean floor, not in land areas where scientists...

science (any tutor)
Luther Burbank was a plant breeder who developed a strain of potato plant that produced more tubers (the part of the root that people eat) of larger size than other potato plants that were grown on farms at the time. This strain of potato was also resistant to the potato ...

science (any tutor)
2. How did Darwin and Lamarck differ in their thinking about change in species? A.Darwin thought that organisms could induce their own changes, while Lamarck thought that change could only be induced by an organism’s environment. B.Darwin thought that change could occur in ...

science (any tutor)
3. Luther Burbank was a plant breeder who developed a strain of potato plant that produced more tubers of larger size than other potato plants that were grown on farms at the time. This strain of potato was also resistant to the potato blight that had wiped out the potato ...

Ms. Sue PLZ HELP!!!(science)
When evolution was first proposed, which of the following was used as evidence to support the idea? A. observations of nature *** B. laboratory experiments C. extensive fossil collections D. genetic sequences

science
a body of mass 5kg is thrown to a height of 100m.what is its potential energy at the maximum height.?

science
calculate the volume of gas at STP that is produced when 1g of silver nitrate is heated. the unbalanced reaction is: AgNO3(s)=Ag(s)+NO2(g)+O2(g)

Science 8
I need help on this portfolio project, I have to do a lab report on light refraction. The research question is "How does change in medium affect light?" and I need to make a hypothesis, but I don't know what to put.

WEATHER SCIENCE SOS! I NEED ANSWERS CHECKED! SOS
How does latitude affect climate? a.) Areas near the equator have cooler climates than areas far from the equator. b.) Areas near the equator have warmer climates than areas far from the equator.*** c.) areas near the equator have 4 seasons.*** d.) areas near the equator do ...

Science
What is the similarities between conduction and radiation What is the similarities between convection and radiation

science
if the actual mass of oxide at the end of the experiment is 130g, what is percentage yield?

science
name four principles of kinetic friction

science
How many kcal of heat energy are removed from the body with every 1 L of sweat?

Science help
Provide two statements that demonstrate the importance of units when describing motion. I don't know how to answer this question :(

science (percentage yield)
if 100g of iron reacts with excess oxygen, how much rust should be produced?

Science
What is the mass of 0.8mol of Na(ii)CO(iii)

Science
Which is the first layer of the atmosphere?

Science
Which of the following is true about all electromagnetic waves in a vacuum? A. they all carry the same energy B. they all travel at the same speed C. they all have the same frequency D. they all have the same wavelength I think it's B

Science
are animal species just any kind of animals.

Science
Which of the following correctly describes a gamma ray? A.long wavelength and low frequency B.long wavelength and high frequency C.short wavelength and low frequency D.short wavelength and high frequency*** check please

Science
When the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate hear, the sound wave is A. reflected B. refracted C. absorbed D. transmitted I think it's C. check please

science
is a squirrel a animal species

Science check answers
1. Which of the following explains how natural selection leads to evolution? Conditions in the environment reduce competition for resources within a species Helpful variations accumulate among surviving members of the species*** Overproduction provides food for stronger ...

Science 8th Grade
In what ways can outside forces affect an object's motion, position, and shape?

science
find the no. of electron transferred between two ppints kept at a potential difference of 20V if 40 J of work is done

Science
Name two types of evidence used to support the theory of evolution. Explain how scientists use each type of evidence to provide support for evolution. Give one example of each.

Science
How did Darwin and Lamarck differ in their thinking about change in species? Darwin thought that organisms could induce their own changes, while Lamarck thought that change could only be induced by an organism’s environment. Darwin thought that change could occur in ...

science
If you could double check my answer that would be awesome :) which of the following is not part of the theory of evolution? Organisms tend to produce more offspring than can survive to reproductive age ** Organisms can acquire changes during their lifetime that can help their ...

Science, please check my answer Ms Sue!
How does a hurricane form? a.)It forms over a warm ocean water as a low-pressure area*** b.) it forms over a warm ocean as a high-pressure area. c.) it forms over cool ocean water as a low-pressure area d.) it forms over a cool ocean water as a high-pressure area. My answer is...

Science
The diagrams show two views of the same river flowing from a lake to an ocean bay. Which diagram below best represents the profile of the river bottom between points C and B?

science
Suppose some natural disaster occurs and a species of finch is forced to relocate from its original island where it dined on cactus flowers to an adjacent island with many fewer cacti but an overabundance of orchids. What would be the immediate consequences to the species in ...

science or biology
Similarities in the early development of chickens and opossums suggest that these organisms share a __________. I think is common ancestor

biology o science
Very few fossils of jellyfish or their close relatives have been found. This makes it hard to trace the evolutionary history of jellyfish using the fossil record. What explains this? (1 point) Jellyfish fossils are buried deep under the ocean floor, not in land areas where ...

Science
2. How did Darwin and Lamarck differ in their thinking about change in species? I think its a

English
7.) "To Mrs. Saville, England, St. Petersburg, Dec. 11th, 17" You will rejoice to hear that no disaster has accompanied the commencement of an enterprise which you have regarded with such evil foreboding..." This excerpt from the introductory portion of Mary Shelley's ...

psychology
PLEASE HELP LAST QUESTION.??? Among William James's contributions to the science of psychology is that he A. he wrote the first American text in psychology b.. developed a psychodynamic treatment for mental illness. c.experimented with classical conditioning d. developed ...

Science
Find the density in g/cm3 of a 1573 cm3 piece of metal having a mass of 46 kg.

Science
A fishtank measures 11 ft X 18 ft X 12 ft in English dimensional units. If water weights 62.4 lbs/ft3, what is the weight in lbs of the water filling the tank?

Science
A fishtank with inside dimensions of 164 cm X 76 cm X 96 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?

science
what is the change in momentum when a body dropped from a height of 20 m and hits the ground and rebounds with the same speed?

science(physics)
The stream of a river is flowing with velocity 1 km/h.What should be the direction of a swimmer to cross the river straight if he can swim at the rate of 2 km/h in still water.

Science: Space
I'm having trouble finding the answers to these fill-in-the-blank questions: Our understanding of the solar system has changed from an Earth-centered model of ____ and ____ to the sun centered model of _____ and _____. I was thinking for the first 2 blanks: rocks; oxygen and ...

Computer science
Write the pseudocode for a method that receives as input the cost of a meal, and then adds a 9% tax rate, and then outputs a 15% tip on top of the price+tax

science please help
after the dna strands are separated, which of the following is the next step of DNA replication in the S phase of the cell cycle? Action of helicase formantion of RNa primer breaking go hydrogen bonds joining of nucleotides i think either B or D

science please help
in evolutionary terms, RNA is thought to have preceded proteins and DNA. Which of the following observations provides the most convincing support for hypothesis? a) there are more types of RNA than there are DNA b) RNA contains combined catalytic, structural, and genetic ...

science please help
after the DNA strands are separated, which of the following is the next step of DNA replication in the S phase of the cell cycle? A) Action of helicase B) formation of RNA primer C) Breaking of hydrogen bonds D) joining of nucleotides i think it is either B or D

science please help
Which of the following factors is the most likely explanation for an energy deficit that results in exercise-induced exhaustion? a. inefficient protein production b. insufficient mitochondrial function c. impaired urea elimination d. absence of oxygen transporters on the cell ...

science @elena please help
it has been hypothesized that chloroplasts originated from photosynthetic cyanobacteria that became symbiotic inside a host cell. Which of the following observations provides the strongest evidence for this suggestion? A) microscopically, chloroplast appear similar to ...

Science
How much heat is produced when the body metabolizes a gram of trioleylglycerol?

Science 6th Grade Please Help!
How does wind affect precipitation? a. Wind does not have any effect on precipitation. b. Winds that blow from over the land contain a lot of water vapor that will cause precipitation. c. Winds that blow inland from oceans or large lakes contain very little water vapor that ...

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