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April 21, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

Post a New Question | Current Questions

Chemistry
At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 7.00 kJ·s–1·m–2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 8.40 ...
Wednesday, February 19, 2014 at 10:33pm

Physics
A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
Wednesday, February 19, 2014 at 8:58pm

Physics
The distance from the earth to the sun is 1.5 times 10 to the 11 power m ( 93 million miles) and the time it takes for one complete orbit of the earth about the sun is one year. How long would it take for a planet located at twice this distance from the sun to complete one orbit?
Wednesday, February 19, 2014 at 6:53pm

PHYSICS
Sun..BLANK....than moon. earth iS..BLANK... mercury.
Wednesday, February 19, 2014 at 2:36pm

science
Which statement about supercell storms is false? A. A supercell storm can produce some of the most violent weather conditions on Earth. B. A supercell storm occurs only during the winter months. C. A supercell storm is characterized by rotating updrafts. D. A supercell storm ...
Wednesday, February 19, 2014 at 11:19am

Physics
Canadian geese migrate essentially along a north-south direction for well over a thousand kilometers in some cases, traveling at speeds up to about 100 km/h. If one such bird is flying at 100 km/h relative to the air, but there is a 38.0km/h wind blowing from west to east. a) ...
Wednesday, February 19, 2014 at 2:14am

Physics
A canoe has a velocity of 0.410m/s southeast relative to the earth. The canoe is on a river that is flowing at 0.510m/s east relative to the earth. Find the magnitude of the velocity v⃗ c/r of the canoe relative to the river
Wednesday, February 19, 2014 at 2:11am

science
in this place Friday comes before Thursday,fall comes before spring,and Mars is closer to the moon than earth?
Tuesday, February 18, 2014 at 9:53pm

science
http://www.mnh.si.edu/earth/text/4_0_0.h​tml
Tuesday, February 18, 2014 at 5:58pm

Math
The formula for the velocity of an object is , where v is the velocity of the object, d is the distance traveled, and t is the time elapsed while that distance is traveled. v=d/t distance = speed times time so time in seconds = distance in meters / speed in meters/second we ...
Tuesday, February 18, 2014 at 4:28pm

Math
distance = speed times time so time in seconds = distance in meters / speed in meters/second we need to know: 1. the speed of light (about 3*10^8 meters/s) 2. the distance from earth to sun (about 1.5*10^11 meters
Tuesday, February 18, 2014 at 4:18pm

Math
Every moment of every day, light pours out from the Sun at the center of our solar system and travels to Earth. It does not arrive at Earth instantaneously though; it takes time to get here. Your task is to figure out how long it takes for light to travel from the Sun to Earth...
Tuesday, February 18, 2014 at 4:05pm

physic 1
F = G M m/r^2 Fmoon = Gm (Mmoon/(distance moon-earth)^2 Fsun = Gm (Msun/(distance sun-earth)^2 Fsun/Fearth = (Msun /Mmoon)[moon-earth)^2/(sun-earth)^2]
Tuesday, February 18, 2014 at 1:03pm

physic 1
The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational forces. Use the data on ...
Tuesday, February 18, 2014 at 12:22pm

physics
If you have learned it is 10N/kg, you have learned it wrong. Nowhere on Earth is it that value. Force=mass*acceleration Newtons=kg*g g= N/kg, this is the same g you know as 9.8m/s^2
Tuesday, February 18, 2014 at 6:57am

physics
we have learnt that Earth's gravitational field strength is 10 N/kg is the same as its acceleration due to free fall (10 m/s/s. even though their units are different, they are said to be dimentionally the same. prove that N/kg is the same as m/s/s
Tuesday, February 18, 2014 at 6:55am

Astronomy
How far will Venus be from Earth on February 19, 2014?
Monday, February 17, 2014 at 9:32pm

science
Which statement best describes Newton’s Law of Universal Gravitation? A.Large objects, like Earth and the Sun, attract other objects everywhere in the universe. B.Gravity is a kind of magnetic force between objects and Earth. C.Gravity is the result of the curvature of ...
Monday, February 17, 2014 at 8:35pm

phsics
m g = G M m /r^2 so m does not matter if we only want ration G M is constant r = earth radius (any units) but be consistent. You might use 6.38*10^6 kg R = r + d .85 G M/r^2 = G M/(r+d)^2 r^2 = .85 (r+d)^2 r = .922 (r+d) r - .922 r = .922 d d = r (1-.922)/.922 = .0846 r
Monday, February 17, 2014 at 5:33pm

phsics
A 75 kg man weighs 735 N on the Earth's surface. How far above the surface of the Earth would he have to go to "lose" 15% of his body weight?
Monday, February 17, 2014 at 5:03pm

science
A person who weighs 600 newtons on Earth would weigh only 100 newtons on the Moon. Which statement best explains why? A.The circumference of Earth is larger than that of the Moon. B.The density of Earth is greater than that of the Moon. C.The mass of Earth is greater than that...
Monday, February 17, 2014 at 4:43pm

earth science
a
Monday, February 17, 2014 at 3:41pm

Physics
A ball is thrown upward in two dimensions with an initial speed of 17 Zlugs per mega handle(made up) near the surface of the planet earth. What will be the y component of the balls velocity at the peak of its trajectory?
Monday, February 17, 2014 at 2:26pm

physics
How far from Earth will Venus be today?
Sunday, February 16, 2014 at 2:14pm

physical science
the diameter of the planet saturn is 10 times that of the earth but the mass of the planet is only 90 times greater than that of the earth.what is the gravitational acceleration or number gs you will feel on saturn?(8.8m.s-2)
Sunday, February 16, 2014 at 12:27pm

maths
body of weight is inversely propotional to square of its distance from center of earth,radius of the earth is 6380 km, how much 80 kg man weigh 1600 km from the surface of earth
Sunday, February 16, 2014 at 4:47am

Physics
calculate the work required to launch a satellite from the surface of the earth (radius6380km) to orbit 6000 km above the surface
Sunday, February 16, 2014 at 4:46am

Physics
The radius of the moon is approximately one quarter of the earth's radius,and its mass is on eightieth of the earth's mass.Calculate the weight of a man with a mass of 80KG on the surface of the moon
Saturday, February 15, 2014 at 9:26pm

physics 1
The sun is more massive than the moon, but the sun is farther from the earth. Which one exerts a greater gravitational force on a person standing on the earth? Give your answer by determining the ratio Fsun/Fmoon of the magnitudes of the gravitational forces. Use the data on ...
Thursday, February 13, 2014 at 10:50pm

English part 1
I'm sure you'll have no problem answering this question after you've read this article. http://www.airspacemag.com/space/single-​room-earth-view-5940961/
Thursday, February 13, 2014 at 7:38pm

english part 1
Which of the following best expresses the writer's main idea in “Single Room, Earth View”? A. Space exploration leads to human progress. B. Space travel offers a unique view of Earth. C. Astronauts are highly trained scientists. D. Pollution is endangering Earth.
Thursday, February 13, 2014 at 7:20pm

Science ( Need help really bad Please!)
F = m g or Weight = mass * acceleration of gravity m is mass, sometimes in kilograms. It is the same everywhere and depends only on which proton and neurons are there and how many. g is the acceleration of gravity. On earth it is about 9.81 meters/second^2 On the moon for ...
Thursday, February 13, 2014 at 4:35pm

Physics
gravity on earth g = 9.81 m/s^2
Wednesday, February 12, 2014 at 7:20pm

science
14. Chemical runoff from fields, oil spills, and erosion is the major source of (1 point) a. air pollution b. water pollution c. hydropower d. renewable energy 15. Which compound causes the depletion of earth's ozone layer? (1 point) a. ultraviolet radiation b. ...
Wednesday, February 12, 2014 at 12:55pm

physics
1 What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) Rg(R−h) R2g(R−h)2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
Wednesday, February 12, 2014 at 6:37am

phy
1 What is the gravitational field strength at a height h above the surface of the Earth? R is the radius of the earth gR2(R+h)2 gR(R+h) Rg(R−h) R2g(R−h)2 2 The instrument used for experimental determination of the value of the universal gravitational constant G is ...
Wednesday, February 12, 2014 at 6:37am

science
Yes, B is the answer. The earth will never run out of wind.
Tuesday, February 11, 2014 at 4:58pm

physics
A seagull flies at a velocity of 10.00 m/s straight into the wind. (a) If it takes the bird 18.0 min to travel 6.00 km relative to the earth, what is the velocity of the wind?
Tuesday, February 11, 2014 at 4:56pm

science
b)Earth's tilt on the axis shifted
Tuesday, February 11, 2014 at 2:00pm

algebra based physics
Electric bees. As they fly through the air, honeybees can pick up a small amount of electric charge. Suppose a 0.12-g bee acquires a charge of –65pC. How many excess electrons has the bee acquired? Find the magnitude of the electric force on the bee in the electric field ...
Monday, February 10, 2014 at 9:59pm

science
r earth = 6,000 km d satellite from earth = 900. r satellite's orbit = 6900 km 2*pi*r = circumference = distance traveled around earth. distance/2 = speed satellite in km/hr d/hr x (1 hr/60 m) x (1 min/60 s) = ? km/s
Monday, February 10, 2014 at 9:34pm

science
What is the average speed of a satellite given the following information. 1) The earth's radius = 6000 km 2) The satellite is 900 km from the earth's surface 3) The satellite's orbital period: 2 hours 4) Circumference = 2pr (p = 3.14) A) 6 km/s B) 10 km/s C) 5 km/...
Monday, February 10, 2014 at 9:10pm

chemistry
Earth's population is about 6.5 billion. Suppose that every person on Earth participates in a process of counting identical particles at the rate of four particles per second. How many years would it take to count 8.10 x 10^23 particles? Assume that there are 365 days in a...
Monday, February 10, 2014 at 7:49pm

chemistry
Earth's population is about 6.5 billion. Suppose that every person on Earth participates in a process of counting identical particles at the rate of four particles per second. How many years would it take to count 8.10 x 10^23 particles? Assume that there are 365 days in a...
Monday, February 10, 2014 at 7:49pm

Science
what would happen to an object if the force of gravity on earth was decreased by half. a- its mass would decrease b- its weight would decrease c- its density would decrease d- its volume would decrease my answer is B
Sunday, February 9, 2014 at 6:04pm

physical science
Consider a 100-kg box of tools in location: A: on Earth B: on the Moon C: on Jupiter. Rank from greatest to the least the a) masses of the 100 kg box of tools and b) the weights of the 100-kg box of tools.
Sunday, February 9, 2014 at 5:20pm

science
A British Concorde (BC) and a French Concorde (FC) flew in opposite directions around the earth (40 000 km). The BC covered half of its flight distance at a supersonic speed of 2500 km/h and the other half at a subsonic speed of 1000 km/h. The FC spent half of its flight time ...
Saturday, February 8, 2014 at 7:13pm

English literature
Here's the poem that includes that line. "Composed Upon Westminster Bridge, September 3, 1802 by William Wordsworth Earth has not anything to show more fair: Dull would he be of soul who could pass by A sight so touching in its majesty: This City now doth, like a ...
Saturday, February 8, 2014 at 1:15pm

science
1.What two things happen to particles in a substance when the substance is heated? 2. What are the three most common states of matter on Earth? 3. Why does a liquid take the shape of whatever container it is in but does not expand to fill the container completely? 4. A certain...
Saturday, February 8, 2014 at 2:00am

science
If we drilled a hole straight through the earth, and dropped a golf ball down the hole, starting initially at rest, how fast would the ball be traveling when it reached the center of the earth. The earth’s radius is 6378 km.
Thursday, February 6, 2014 at 8:28pm

Math
Simplify the expression. (-4)^-6(-4)^-7 My answer: -4 Simplify and give the answer in scientific notation. (5 X 10^6((3 X 10^5) My answer: 1.5 X 10^12 (3 X 10^6)(8 X 10^-4) My answer: 2.4 X 10^3 Astronomers measure large distances in light-years. One light-year is the distance...
Thursday, February 6, 2014 at 2:40pm

earth space science
5 billion
Thursday, February 6, 2014 at 9:29am

science
Which statement about supercell storms is false? A. A supercell storm can develop into a self-sustaining, extremely powerful storm. B. A supercell storm is characterized by rotating updrafts. C. A supercell storm occurs only during the winter months. D. A supercell storm can ...
Wednesday, February 5, 2014 at 8:51pm

english
9. What personality trait does Odysseus reveal when he devises a plan to listen to the Sirens' song and yet escape destruction? (1 point) irritability loyalty curiosity generosity10. Read the following passage from the Odyssey: Tell me, where was it, now, you left your ...
Wednesday, February 5, 2014 at 4:40pm

Physics
If the period of the moon were 31 days while its orbit radius 3.8x10^8m, what would the mass of the Earth be?
Wednesday, February 5, 2014 at 3:21pm

english (check my work)
9. What personality trait does Odysseus reveal when he devises a plan to listen to the Sirens' song and yet escape destruction? (1 point) irritability loyalty curiosity generosity10. Read the following passage from the Odyssey: Tell me, where was it, now, you left your ...
Wednesday, February 5, 2014 at 3:12pm

physic
During fair weather, an electric field of about 100 N/C points vertically downward into the earth's atmosphere. Assuming that this field arises from charge distributed in a spherically symmetric manner over the surface of the earth, determine the net charge of the earth ...
Wednesday, February 5, 2014 at 12:40pm

Physics
Consider an interstellar spaceship powered by matter-antimatter reactions. The energy resulting from the matter-antimatter reactions is ejected from the exhaust as electromagnetic radiation producing thrust. The design goal is to have the thrust produce an acceleration equal ...
Wednesday, February 5, 2014 at 9:25am

english
9. What personality trait does Odysseus reveal when he devises a plan to listen to the Sirens' song and yet escape destruction? (1 point) irritability loyalty curiosity generosity10. Read the following passage from the Odyssey: Tell me, where was it, now, you left your ...
Tuesday, February 4, 2014 at 11:34pm

Physics
The earths mass is m=5.98*10^24 kg and physics students masss is 70 kg. Knowing that the gravitational force between the student and the earth is 392 N of force, what is the distance between the student and the Earths center?
Tuesday, February 4, 2014 at 11:01pm

Science~!!!
In order to release the energy stored in fossil fuels, they must be (1 point) Burned*** Refined into gasoline Mined from below the surface of earth Transported to a power plant Coal is a fossil fuel that is relatively inexpensive. This is one reason many people choose to use ...
Tuesday, February 4, 2014 at 1:43pm

Physics - General Physics
An airplane with a speed of 74.5 m/s is climbing upward at an angle of 64.8 degrees with respect to the horizontal. When the plane's altitude is 687 m, the pilot releases the package. (a) Calculate the distance along the ground measured from a point directly beneath the ...
Tuesday, February 4, 2014 at 12:13am

Physics - General Physics
An airplane with a speed of 74.5 m/s is climbing upward at an angle of 64.8 degrees with respect to the horizontal. When the plane's altitude is 687 m, the pilot releases the package. (a) Calculate the distance along the ground measured from a point directly beneath the ...
Tuesday, February 4, 2014 at 12:01am

physics
How do I calculate the radial acceleration in g's? For example: Calculate the radial acceleration (in g’s) of an object on the ground at the earth's equator, turning with the planet. Earth's radius is 6380 km.
Monday, February 3, 2014 at 10:16pm

Physics Please check my answers
It's possible for a body to have both rotational and translational motion at the same time. True. << False. 2. The moment of inertia of an object would be different on the surface of the earth than on the surface of the moon. True. << False. 3. The moment of ...
Monday, February 3, 2014 at 1:01pm

EARTH SCIENCE
A. flood stage. B. capacity. C. crest. D. plateau. What do you think?
Monday, February 3, 2014 at 11:08am

EARTH SCIENCE
When the water level of a stream or river exceeds its natural banks, it has reached its
Monday, February 3, 2014 at 9:19am

Physics
A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25 meters above the ground. Then, 0.6 seconds after the red ball is thrown, a blue ball is thrown upward with an initial speed of 22.9 m/s, from a height of 0.8 meters above the ground. The force of ...
Sunday, February 2, 2014 at 6:25pm

Physics
A blue ball is thrown upward with an initial speed of 19.6 m/s, from a height of 0.5 meters above the ground. 2.4 seconds after the blue ball is thrown, a red ball is thrown down with an initial speed of 7.9 m/s from a height of 22.1 meters above the ground. The force of ...
Sunday, February 2, 2014 at 4:35pm

physics
ind the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×10^23kg), when Mars is at its closest to Earth (distance = 5.6×10^10m).
Sunday, February 2, 2014 at 3:04pm

physics
Find the force of gravity between a newborn baby (mass = 2.9kg ) and the planet Mars (mass = 6.4×1023kg), when Mars is at its closest to Earth (distance = 5.6×1010m).
Sunday, February 2, 2014 at 3:01pm

physics
What is the ratio of the gravitational force on you when you are 5800 km above the Earth's surface versus when you are standing on the surface? (The Earth's radius is about 6400 km.)
Saturday, February 1, 2014 at 6:02pm

Science
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite B? 2. A common characteristic of mountains formed by two colliding continents is marine _______ rock. A. sedimentary B. metamorphic C. limestone D. igneous A...
Saturday, February 1, 2014 at 3:54pm

SCIENCE
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite A? 2. All the processes that form mountain ranges are known as A. arch vibrations. B. compressive forces. C. orogeny. D. island arcing. C? 3. _______ describes...
Saturday, February 1, 2014 at 3:39pm

Science
http://www.windows2universe.org/earth/At​mosphere/mesosphere.html
Saturday, February 1, 2014 at 2:43pm

Science
1. _______ magma causes powerful and explosive volcanic eruptions. A. Andesitic B. Rhyolitic C. Basaltic D. Composite A? 2. All the processes that form mountain ranges are known as A. arch vibrations. B. compressive forces. C. orogeny. D. island arcing. C? 3. _______ describes...
Saturday, February 1, 2014 at 2:20pm

science
Earth is a satellite because it moves around the sun.
Thursday, January 30, 2014 at 11:47pm

science
The Earth is a satellite of the sun? If not can you tell me what it is?
Thursday, January 30, 2014 at 11:19pm

math
1.The land on Earth’s surface is represented by the seven continents. Europe has 77% of the dry land while Africa has 20%. North America has 4/25 and Antarctica has 1/10 of the dry land. What fractional amount of the dry land is contained within the three remaining ...
Thursday, January 30, 2014 at 3:50pm

Physics
T = 2 pi sqrt (L/g) 3.3 = 2 pi sqrt (1.5/g) sqrt(1.5/g)= .5252 1.5/g = .276 g = 5.44 m/s^2 around half earth g
Thursday, January 30, 2014 at 3:34pm

Chemistry
At noon on a clear day, sunlight reaches the earth\'s surface at Madison, Wisconsin, with an average power of approximately 1.00 kJ·s–1·m–2. If the sunlight consists of photons with an average wavelength of 510.0 nm, how many photons strike a 1.30 ...
Thursday, January 30, 2014 at 10:40am

science
Granite is an igneous rock that forms from magma cooled below Earth's surface.Why would granite have larger crystals than igneous rocks formed from lava cooled above Earth's surface?
Wednesday, January 29, 2014 at 8:41pm

Science
1. The combination of sulfur dioxide, nitrogen oxide, and atmospheric moisture creates A. drinking water. B. smog. C. pesticides. D. acid rain. D? 2. Another name for unicellular organisms that dominated Earth up to the Precambrian time is A. eukaryotes. B. cyanobacteria. C. ...
Wednesday, January 29, 2014 at 7:23pm

MATH
cars generally run on burning fossil fuel (gasoline, diesel) but even if they run on electricity they increase the effect two ways at least: 1. The elctricity is often generated by burning coal or oil. 2. Even if the electricity is generated using wind or solar power or water ...
Wednesday, January 29, 2014 at 4:11pm

Physics
Radius of earth = 6,371 kilometers 248 miles = 399 kilometers so r = 6371+399 = 6770 100 (6371/6770)^2 = 88.6 %
Wednesday, January 29, 2014 at 5:52am

Physics
Calculate the percentage of Earth’s gravitational force on the ISS astronauts while orbiting at an altitude of 248 miles above Earth’s surface. To do this, compare the gravitational force on an orbiting astronaut to the force on the astronaut here at Earth’s ...
Tuesday, January 28, 2014 at 11:18pm

earth (or Biology?)
You collect some pond water and filter out the different organisms into separate jars. You add no food to the water, but one kind of organism is still alive long after the others have died. That species is best described as being _________.
Tuesday, January 28, 2014 at 11:02pm

Writing Evaluation (Writeacher)
Is this better? In my opinion, the use of “scary things” as entertainment is redundant, mainly because I don’t understand what is so enjoyable about fear. It is what haunts us, even as young children. Yes, we are taught to face it, but not to use it for our ...
Tuesday, January 28, 2014 at 8:37pm

Writing Evaluation (Writeacher)
Correction: In my opinion, the use of “scary things” as entertainment is redundant, mainly because I don’t understand what is so enjoyable about fear. It is what haunts us, even as young children. Yes, we are taught to face it, but not to use it for our ...
Tuesday, January 28, 2014 at 8:10pm

Writing Evaluation (Writeacher)
Should I revise anything? In my opinion, the use of “scary things” as entertainment is redundant. I mean, honestly, what on earth is so enjoyable about fear? Fear is what haunts us and frightened us even as young children. Yes, we are taught to face it, to not fear ...
Tuesday, January 28, 2014 at 7:25pm

Vectors
I think we have to assume friction is not important and the object is on earth.
Tuesday, January 28, 2014 at 5:54pm

Vectors
We need to know the slope of the ramp, if friction is important, and if the object is on earth.
Tuesday, January 28, 2014 at 5:30pm

physics
The wording of this question puzzles me because if they are in orbit they feel no gravitational force since the centripetal acceleration (v^2/R) exactly balances earth gravity. However if you wish to separate out those two factors then use Forbit = G m Me / Rorbit^2 Fground = ...
Tuesday, January 28, 2014 at 5:04pm

physics
Calculate the percentage of Earth’s gravitational force on the ISS astronauts while orbiting at an altitude of 248 miles above Earth’s surface.
Tuesday, January 28, 2014 at 4:56pm

EARTH SCIENCE- SO STUCK
Well, the speed of compression and shear waves depends strongly on the characteristics of the ground they are passing through. We could get answers all over those choices depending on what we chose for the difference in speed. Your text or course notes must have given you ...
Tuesday, January 28, 2014 at 3:07pm

world history
Africa's society and economy was tremendously varied. It's a huge continent that included the arid north and the rainy south. Not only was it home to Egypt, one of the oldest civilizations on earth, but also the Great Rift Valley, the probable origin of homo sapiens. ...
Tuesday, January 28, 2014 at 2:43pm

EARTH SCIENCE- SO STUCK
thanks, i got that too, my fault i should've included the options 1.7 x 10^3 9.9 x 10^3 3.5 x 10^3 4.7 10^3
Tuesday, January 28, 2014 at 2:32pm

EARTH SCIENCE- SO STUCK
The difference in speed is maybe 8 km/s these are 5*60 = 300 seconds apart so 8 * 300 = 2400 km
Tuesday, January 28, 2014 at 1:56pm

EARTH SCIENCE- SO STUCK
How far from an earthquake epicenter is a city where the difference between the P-wave and the S-wave arrival times is 5 minutes and 00 seconds?
Tuesday, January 28, 2014 at 1:41pm

earth
http://highered.mcgraw-hill.com/sites/dl​/free/0073016543/398471/chamberlin1e_sam​plechapter.pdf
Tuesday, January 28, 2014 at 11:42am

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