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April 18, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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Physics
What do you think? The moon has much less mass than Earth.
Tuesday, September 18, 2012 at 1:43am

Physics
Consider a space pod somewhere between earth and the moon, at just the right distance so that the gravitational attractions to Earth and Moon are equal. Is this location nearer Earth or Moon?
Tuesday, September 18, 2012 at 1:12am

physics
(a) If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 3.43 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2? m (b) Repeat for Mars, where the acceleration due to gravity...
Tuesday, September 18, 2012 at 12:14am

Earth Science
idk
Monday, September 17, 2012 at 5:51pm

Physical Chemistry
The escape velocity, the velocity required by an object to escape from the gravitational field is given V^e = (2gr)^1/2 where r is the radius for Earth (6.37 x 10^6m). At what temperature will the c of an H2 molecule and of an N2 molecule attain the escape velocity?
Monday, September 17, 2012 at 3:42pm

6th grade science
biosophere, geosphere, hydrosphere http://www.windows2universe.org/earth/es​s1.html
Sunday, September 16, 2012 at 9:14pm

6th grade science
What two parts of the earth system is a paleontologist involved in? Thanks
Sunday, September 16, 2012 at 8:58pm

science
if a rock undergoes high temperatures and high pressures deep within Earth, what new type of rock will be foremed? Assume that the rock does not melt
Sunday, September 16, 2012 at 8:33pm

Algebra 2
How many 2 liter mountain dew bottles would it take to fill up the earth if the radius is 6378.1?
Sunday, September 16, 2012 at 8:21pm

math
It is estimated that one third of one per cent of the Earth’s surface receives more energy from the sun than the total projected needs for the year 2014. Assuming the Earth’s surface to be 1.97 x 108 square miles. Find the area in acres.
Sunday, September 16, 2012 at 7:27pm

Earth Science
I think u studied in NC ? lol I'm doing the sheet and downloaded it from diff places to get the right answers
Sunday, September 16, 2012 at 5:25pm

Earth Science
I think u studied in NC ? lol I'm doing the sheet and downloaded it from diff places to get the right answers
Sunday, September 16, 2012 at 5:24pm

Physics
Suppose a brick has a mass of 4.50 kg. What is the brick's weight at the surface of the Earth
Sunday, September 16, 2012 at 1:07pm

Physics
Suppose a brick has a mass of 4.50 kg. What is the brick's weight at the surface of the Earth
Sunday, September 16, 2012 at 1:06pm

Physics
Air molecules create an upward force that impacts the free fall of objects on the surface of the Earth, differing form the way an object would fall in vacuum. Question: What kind of objects should be used for experimentation if we want to limit the impact on our experimental ...
Sunday, September 16, 2012 at 9:08am

physics
The earth moves around the sun in a nearly circular orbit of radius 1.50 1011 m. During the three summer months (an elapsed time of 7.89 106 s), the earth moves one-fourth of the distance around the sun.
Sunday, September 16, 2012 at 4:11am

physics
The earth moves around the sun in a nearly circular orbit of radius 1.50 1011 m. During the three summer months (an elapsed time of 7.89 106 s), the earth moves one-fourth of the distance around the sun.
Sunday, September 16, 2012 at 4:10am

Physics
A 4.51-kg object is thrown vertically upward from the surface of Earth, where the acceleration due to gravity is g1 = 9.81 m/s2. The initial velocity is v1, and the object reaches a maximum height of y1. What is the maximum height, y2, if the object is thrown with a speed of ...
Saturday, September 15, 2012 at 4:40pm

physics
An airplane with a speed of 88.0 m/s is climbing upward at an angle of 72.1 ° with respect to the horizontal. When the plane's altitude is 779 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Saturday, September 15, 2012 at 4:06pm

physical science
downward motion H=gt²/2 t=sqrt(2H/g) Time↑= time↓ => Total time = 2 •sqrt(2H/g). Since g(Venus)<g(Earth) , t(Venus)>t((Earth)
Saturday, September 15, 2012 at 5:20am

Physics
centripetal acceleration = V^2/R For R, add 710,000 m to the radius of the earth. Use meters The earth's radius is about 6400 km, but you should look it up.
Saturday, September 15, 2012 at 1:35am

Physics
If a satellite is orbitting the earth 710km above the earths surface, and it's velocity is 7,406.8 meters/sec, what is it's cetripedal acceleration??
Friday, September 14, 2012 at 11:29pm

earth
waste produced by people along the east coast of the united states has been dumped into the atlantic ocean where it is distriuted y surface ocean currents, Which coastel area is most liekly to become polluted by this waste?
Friday, September 14, 2012 at 8:35pm

physical science
the acceleration of gravity on the surface of venus is 8.9 m/s2. would a ball thrown upward from venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?
Friday, September 14, 2012 at 7:37pm

chemistry
"The sun emits UV radiation that can have serious health consequences. In particular, so-called UVB radiation is mostly absorbed by the ozone layer in the upper atmosphere (altitudes of 10 - 50 km), but the part that reaches the earth can cause DNA mutations. The highest ...
Friday, September 14, 2012 at 11:09am

5th grade math (Danny)
First, if you have a question, it is much better to put it in as a separate post in <Post a New Question> rather than attaching it to a previous question, where it is more likely to be overlooked. http://yellowmagpie.com/about-the-moon-v​ital-in-the-creation-and-...
Friday, September 14, 2012 at 12:37am

5th grade math
How long does the retraction of the moon from the earth?
Thursday, September 13, 2012 at 11:29pm

Chemistry
"The sun emits UV radiation that can have serious health consequences. In particular, so-called UVB radiation is mostly absorbed by the ozone layer in the upper atmosphere (altitudes of 10 - 50 km), but the part that reaches the earth can cause DNA mutations. The highest ...
Thursday, September 13, 2012 at 11:19pm

math
It is estimated that one third of one per cent of the Earth’s surface receives more energy from the sun than the total projected needs for the year 2014. Assuming the Earth’s surface to be 1.97 x 108 square miles. Find the area in acres.
Thursday, September 13, 2012 at 9:46pm

5th grade math
The moon is about 240.000 miles from Earth. What is this distance written as a whole number multiplied by the power of ten?
Thursday, September 13, 2012 at 9:11pm

math
What on earth does this mean? "two proudest cm on each side"
Thursday, September 13, 2012 at 8:03pm

earth science
Right.
Thursday, September 13, 2012 at 11:26am

earth science
shelf
Thursday, September 13, 2012 at 11:23am

earth science
http://www.google.com/search?q=continent​al+shelf&hl=en&prmd=imvns&tbm=isch&tbo=u​&source=univ&sa=X&ei=RvpRUMm-I4i9ywGij4D​ADA&sqi=2&ved=0CCcQsAQ&biw=711&bih=453
Thursday, September 13, 2012 at 11:23am

earth science
The gently sloping shallow area that extends from the continental shore is the called the continental?
Thursday, September 13, 2012 at 11:20am

physics
On Planet Y, the value of g is 12 m/s/s. If the human weighs 685 N on this planet, then how much woud he weigh on earth?
Wednesday, September 12, 2012 at 9:00pm

chemistry
If the sun is 150,000,000 km away, how many minutes does it take light to travel from the sun to the earth? Assume light travels at a speed of 3.0x10^10 cm/sec
Wednesday, September 12, 2012 at 5:27pm

AP Biology
1.Oparin and Haldane hypothesized that the Earth's early atmosphere was strongly (2 points) acidic. oxidizing. reducing. ~~ ionic. 2.The most significant outcome of the Miller and Urey experiments was that they (2 points) synthesized living cells from nonliving matter. ...
Wednesday, September 12, 2012 at 4:06pm

physics
Find the magnitude and relative direction (e.g., NE, NW, SE, SW) of the velocity of an airplane relative to the earth, if the velocity of the airplane relative to the air is 165 km/hr. south to north and the wind velocity is 65 km/hr. at an 50o angle from east to west.
Tuesday, September 11, 2012 at 10:14pm

Physics
If a person can jump a maximum horizontal distance (by using a 45° projection angle) of 2.35 m on Earth, what would be his maximum range on the Moon, where the free-fall acceleration is g/6 and g = 9.80 m/s2? b) (b) Repeat for Mars, where the acceleration due to gravity is...
Tuesday, September 11, 2012 at 8:28pm

earth science
1500/625 = 2.4 meters per second
Tuesday, September 11, 2012 at 5:55pm

earth science
A swimmer completed the 1,500 meter freestyle in 625 seconds. What was his average speed?
Tuesday, September 11, 2012 at 5:45pm

English
I have to analyze John F. Kennedy's inaugural address. I need to find the thesis, preview statement (forecasting or signposting), because statement (why the audience might be interested in listening), transitions, a restatement of thesis, and a clincher. Here is the text ...
Monday, September 10, 2012 at 6:36pm

Biology 1
Briefly describe the basic characterisitics that all living things on Earth have in common.
Monday, September 10, 2012 at 6:07pm

Precalculus
Find the distance along an arc on the surface of the earth that subtends a central angle of 1 minute. (1 minute = 1/60 degree) This is a nautical mile. Note that the radius of the Earth is 3960 miles and there are 1760 yards in a mile. Express your answer in both miles and yards.
Monday, September 10, 2012 at 5:18pm

geography
Will you check my answers for me? 1. How many states are part of the contiguous United States? 48 states 2. Is the Tropic of Cancer north or south of the equator? North of the Equator 3. What are the names of the Earth's continents? North America, South America, Antarctica...
Monday, September 10, 2012 at 5:14pm

Science
If you are referring to the earth's equator, that is an imaginary line around the earth equidistant from the north pole and the south pole that divides the earth into the northern hemisphere and the southern hemisphere.
Monday, September 10, 2012 at 4:00pm

electric engineering
An aircraft has a wing span of 56 m. It is flying horizontally at a speed of 900 km/hr and the vertical component of earth’s magnetic field is 0.4 m Wb/m2. Calculate the P.D between the wing tips of the air craft
Monday, September 10, 2012 at 2:50pm

English 8R - Business Letter Assignment Check
one of them was a typo, sorry about that and how on earth you guys is disrespectful...????? If I say you inspire me a lot I had to add you guys because I referring to the hole family... never mind I'll take it out then but is my letter is good thought and be honest because...
Sunday, September 9, 2012 at 3:39pm

Chemistry
What does the reaction of alkaline earth metals with water tell you? Thanks in advance.
Sunday, September 9, 2012 at 3:03pm

Physics
What is the speed of the rocket when it is 350 above the surface of the earth? A rocket starts from rest and moves upward from the surface of the earth. For the first 10 of its motion, the vertical acceleration of the rocket is given by a(y)=2.9, where the -direction y+ is ...
Sunday, September 9, 2012 at 12:39pm

physics
a boy throws a stone straight upward with an initial speed of 15 m/s on the surface of the earth. what maximum height above the starting point will the stone reach before falling back down?
Saturday, September 8, 2012 at 10:58am

earth science
You'll find many facts here. http://en.wikipedia.org/wiki/Hurricane_I​saac_(2012)
Friday, September 7, 2012 at 7:08pm

earth science
What are 10 facts about hurricane Isaac?
Friday, September 7, 2012 at 7:02pm

world geography
Where on Earth? which of the 12 northern eurasian cities will be the home of your company's newest restaurant? hint: use information from an atlas and al almanac to eliminate all but one city
Friday, September 7, 2012 at 12:11am

Earth/Space Science
What is one way you can make a difference and decrease the impacts of soil erosion?
Thursday, September 6, 2012 at 8:14pm

earth
17%
Thursday, September 6, 2012 at 3:37pm

earth
how long will it take Uranium-238 for there to ne 25% of the original radioactive period to be left? i need this question answered ASAP!!!!!(:
Thursday, September 6, 2012 at 9:05am

Science
W(Earth) =mg(E) W(Moon)= mg(M)=mg(E)/6=W(Earth)/6
Wednesday, September 5, 2012 at 4:01pm

earth
V = kE 106 = k*120 k = 53/60 53/60 * 180 = 159
Wednesday, September 5, 2012 at 3:38pm

earth
The weight (V) of an object on Venus varies directly as its weight (E) on Earth. A person weighing 120 lb on Earth would weigh 106 lb on Venus. How much would a person weighing 180 lb on Earth weigh on Venus?
Wednesday, September 5, 2012 at 2:50pm

Math
How ever did you get 82 1/2 weeks? 686 days is 321 days longer than the 365-day earth year. 321 days = 45 6/7 weeks When you post a question, it is always helpful to show your calculations, so we can figure out where you went wrong, if you did.
Wednesday, September 5, 2012 at 11:13am

Math
A year on Mars is 686 Earth Days. (1) Which is longer, a year on Mars or a year on Earth? (2)By how many weeks is it longer? Submit two answers. Please explain how you got the answers. My 1st answer was Mars the 2nd answer I 82 1/2 weeks. Please help
Wednesday, September 5, 2012 at 10:59am

physics
This is what i did but i totally could of got it so wrong. this assignment is way harder then i thought it would be :) Landing craft mass=12000kg d=160m above moon surface Vi=15m/s g on earth=9.81m/s g on moon g/6 g on moon=1.635m/s Vf=0m/s Needed thrust=?? Assuming the crafts...
Wednesday, September 5, 2012 at 9:34am

math
1. A year on earth is 365 earth days so a year on mars would be longer. 2. 686-365= 321 days longer 321 days divided by 7 days in one week = 45.857 weeks longer.
Tuesday, September 4, 2012 at 10:23pm

math
A year on Mars is 686 Earth Days. (1) Whicch is longer, a year on Mars or a year on Earth. (2) By how many weeks is it longer? Please explain how you got the answer. My answer was 82 1/2 weeks longers
Tuesday, September 4, 2012 at 9:33pm

Science
If on earth you weigh 420 newtons, and the gravitational pull on the moon is 1/6 of what it is on earth. What would be your weight on the moon?? Please show work Thanks!! :)
Tuesday, September 4, 2012 at 8:46pm

physics
A red ball is thrown down with an initial speed of 1.2 m/s from a height of 25.0 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 ...
Monday, September 3, 2012 at 8:39pm

college
A blue ball is thrown upward with an initial speed of 19.8 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 22.5 meters above the ground. The force of ...
Monday, September 3, 2012 at 7:33pm

physics
circumference of earth = 2pi*6.37*10^3 km = 4.00*10^4 km so, a person travels that many km in 24 hours: 4.00*10^4km/24hr = 1667.66km/hr to get m/s, just multiply by the needed units: 1667.66km/hr * 1000m/km * 1hr/3600s = 463.24m/s
Friday, August 31, 2012 at 5:03pm

physics
if the radius of the earth is 6.37 times 10 to the third power in km, what is the speed in km/h resulting from the rotation of earth of a person standing on the equater. then, convert the answer to m/s.
Friday, August 31, 2012 at 3:08pm

earth
According to the condensation theory, the most important factor for the formation of our planets was __
Friday, August 31, 2012 at 9:56am

Math
The earth is approximately a sphere. It's diameter is about 12730km. Water covers approximately 66% of the earths surface. How many square kilometers of land covers the earths?
Friday, August 31, 2012 at 1:36am

Physics
The sun is 1.40•10^11m away and light travels at 3.00•10^8m/s. Calculate how long it takes light from the sun to reach the earth. Express your answer in scientific notation.
Tuesday, August 28, 2012 at 3:25pm

Physics
The sun is 1.40•10^11m away and light travels at 3.00•10^8m/s. Calculate how long it takes light from the sun to reach the earth. Express your answer in scientific notation.
Tuesday, August 28, 2012 at 3:24pm

Physics
The sun is 1.40•10^11m away and light travels at 3.00•10^8m/s. Calculate how long it takes light from the sun to reach the earth. Express your answer in scientific notation.
Tuesday, August 28, 2012 at 3:24pm

Physics
The sun is 1.40•10^11m away and light travels at 3.00•10^8m/s. Calculate how long it takes light from the sun to reach the earth. Express your answer in scientific notation.
Tuesday, August 28, 2012 at 3:23pm

physics
A red ball is thrown down with an initial speed of 1.0 m/s from a height of 27.0 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 24.5 m/s, from a height of 0.7 meters above the ground. The force of ...
Monday, August 27, 2012 at 8:38pm

physics
A helicopter is ascending vertically with a speed of 4.50 m/s. At a height of 195 m above the Earth, a package is dropped from a window. How much time does it take for the package to reach the ground? [Hint: The package's initial speed equals the helicopter's.]
Monday, August 27, 2012 at 8:01pm

operations mgmt
What on earth is the Process 1 tab?
Monday, August 27, 2012 at 4:56pm

physics
g on mars is 38% of earth's, which is 9.8 m/s^2 so, weight of 6kg on mars is .36*9.8*6 = 21.168N
Monday, August 27, 2012 at 3:03pm

physics
if an object weighs 6 kgs on earth, what will it's weight be on mars
Monday, August 27, 2012 at 1:39pm

earth
volume of earth is 4/3 pi * 6370^3 = 10.8270*10^11 km^3 volume of core is 4/3 pi * (6370-2890)^3 = 1.7653*10^11 km^3 volume of crust+mantle is thus 9.0617*10^11 km^3 5.5*10.8270*10^11 = 4.5*9.0617*10^11 + d*1.7653*10^11 d = 10.6 g/cm^3
Monday, August 27, 2012 at 11:17am

OPTICS/PHYSICS-REALLY DO NOT UNDERSTAND THIS!
pe·num·bra/peˈnə​mbrə/ Noun: The partially shaded outer region of the shadow cast by an opaque object. The shadow cast by the earth or moon over an area experiencing a partial eclipse.
Monday, August 27, 2012 at 7:56am

earth
The radius of the Earth is approximately 6370 km. If one could dig down straight towards the center of the Earth, one would find that the outermost 2890 km (the crust and the mantle) has an average density of about 4.5 g/cm3. Farther down is the core. If the average density of...
Sunday, August 26, 2012 at 11:23pm

math
a building cast a shadow approximately 130 ft long on the street when the suns ray form an 82.9 degree angle with the earth. how tall is the building? 180-82.9-90= 7.1 degree tan 7.1 = x/130ft x= 16.19ft is this correct? thanks!
Sunday, August 26, 2012 at 10:42pm

world history
with the adoption of hristianity by constantine, the emperor a. stopped using images of pagan gods b. was no longer worshipped as a god c. ended pagan rituals and ceremonies d. was called God's deputy on earth
Sunday, August 26, 2012 at 4:01pm

Physics
The distance it falls in t seconds after being dropped is H = (1/2) g t^2 g is the acceleration of gravity, which you must have learned about by now. It is 9.8 m/s^2 on Earth. Set t = 1.7 seconds and use the formault to solve for the height, H, in meters.
Sunday, August 26, 2012 at 2:54pm

physics
If the body is hanging from the rope the tension is 50 Newtons on earth ignoring the mass of the rope.
Saturday, August 25, 2012 at 1:42am

Biology
1. Which of the following is the definition of ecology? the social movement with a goal to protect the environment the recycling of human-made materials to reduce waste going into landfills the study of interactions among organisms and between organisms and their environment ...
Friday, August 24, 2012 at 4:06pm

Math (Trig/pre-calculus)
some stars are so far away that their position appear fixed as earth orbits the sun. other stars, however, appear over time to shift their positions relative to the background of "fixed" stars. suppose that the star shown below appears to shift through an arc of ...
Thursday, August 23, 2012 at 9:52pm

Calculus
The percentage of the moon's surface that is visible to a person standing on the Earth varies with the time since the moon was full. The moon passes through a full cycle in 28 days, from full moon to full moon. The maximum percentage of the moon's surface that is ...
Thursday, August 23, 2012 at 7:18pm

Earth Science
1 false. 2. UR trying to make me do school, arent you?
Thursday, August 23, 2012 at 11:31am

science
BBOOOOOO! BIG BANG NEVER HAPPENED! HERES PROOF: This is my theory: according to the big bang, there is a equal amount of anti-matter to the matter, BUT nearly all that matter is missing! In this theory there was NO anti-matter when the earth was made. Anti-matter is made when ...
Thursday, August 23, 2012 at 11:29am

Science, Astrenomey
that's a negative. :-) Before pursuing a theory, do a little research. For example, when the log is burnt, the ashes have less mass, but you also need to include the gases created by the combustion, as well as the fine particles that blow away, and the energy produced by ...
Thursday, August 23, 2012 at 10:29am

Science, Astrenomey
This is my theory, read well if you wish to know the truth: according to the big bang, there is a equal amount of anti-matter to the matter, BUT nearly all that matter is missing! In this theory there was NO anti-matter when the earth was made. anti-matter is made when ...
Thursday, August 23, 2012 at 9:45am

math
the force of gravity varies inversely as the square of the distance between the centers of the two masses. If an object weighs 500 pounds at a distance of 12,000 miles from the center of the earth, at what distance will the weight be 50 pounds
Sunday, August 19, 2012 at 2:13am

Business
yes it is, specially when the midget on the meteor is the one who will actually come on earth and stop all the greed that is goin on in American corporations, therefore if the baseball league or the football league stop calling this crap world series where only american teams ...
Saturday, August 18, 2012 at 2:49pm

College Chemistry
The sun bombards the earth with about 1KJ m^-2s^-1. Calculate the maximum mass of pure ethanol that can be vaporized in 10 min from a beaker left in strong sunshine, assuming the surface area of the ethanol t be 50cm^2.
Wednesday, August 15, 2012 at 7:25pm

Chemistry
Strong sunshine bombards the earth with about 1 kJ.m-2.s-1 Calculate the maximum mass of pure ethanol that can be vaporized in 10. min from a beaker left in strong sunshine, assuming the surface area of the ethanol to be 50.cm 2 .
Wednesday, August 15, 2012 at 5:11pm

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