Saturday
July 30, 2016

Homework Help: Science: Earth

Recent Homework Questions About Earth

CARS Passages
CARS 1: Introduction to CARS Passages Passage I Those who consider the Devil to be a partisan of Evil and angels to be warriors for Good accept the demagogy of the angels. Things are clearly more complicated. Angels are partisans not of Good, but of Divine creation. The Devil...
Saturday, October 31, 2015 by Tina

physics
Use Kepler’s laws and the period of the Moon (27.4 d) to determine the period of an artificial satellite orbiting very near the Earth’s surface.
Friday, October 30, 2015 by rani

physics
Calculate the period of a satellite orbiting the Moon, 95 km above the Moon’s surface. Ignore effects of the Earth. The radius of the Moon is 1740 km.
Friday, October 30, 2015 by rani

physics
Calculate the speed of a satellite moving in a stable circular orbit about the Earth at a height of 4800 km.
Friday, October 30, 2015 by rani

physics
Calculate the force of Earth’s gravity on a spacecraft 2.00 Earth radii above the Earth’s surface if its mass is 1850 kg.
Friday, October 30, 2015 by rani

Social Studies Please Check My Answers
Which pair of basic questions guides geographers in their work? (1 point) Where are things located? and Why are they there?* What is the climate? and Why has it changed? When did Earth form? and What is it made of? Who lived where? and When did they move? 2. To learn more ...
Thursday, October 29, 2015 by Sam

physics
the earth is,on average,150 million km from the sun.calculate its average speed in orbit.
Thursday, October 29, 2015 by dave getch

Astronomy
Why is the greenhouse effect on Earth not as drastic as on Venus? -There is no carbon dioxide in Earth’s atmosphere. -The oceans dissolved much of the carbon dioxide. -Earth is smaller than Venus so it can’t hold the gases in the atmosphere. -There is more carbon ...
Wednesday, October 28, 2015 by Sandra

Earth Science
How to draw 40 degrees north and 70 degrees south with latitude and longitude. plez tell me how to draw it because im studying for a test and they tell me the questions I just need to know how to DRAW IT NOT WEBSITES BUT ITS STILL OK
Wednesday, October 28, 2015 by Ameen from school I.S.187

Earth Science
How to draw 40 degrees north and 70 degrees south with latitude and longitude
Wednesday, October 28, 2015 by Ameen from school I.S.187

Language Arts
Decide whether each list of nouns is common or proper. Add another example to each list. Write P if the list shows proper nouns. Write C if the list shows common nouns. 1. Nebraska, Colorado, Utah-p Example: New York 2. spikes,wood ties, sledgehammers-c Example: axes 3. Dr. ...
Wednesday, October 28, 2015 by Patrick

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****
Wednesday, October 28, 2015 by Cami

Astronomy
Why is the greenhouse effect on Earth not as drastic as on Venus? There is no carbon dioxide in Earth’s atmosphere. The oceans dissolved much of the carbon dioxide. Earth is smaller than Venus so it can’t hold the gases in the atmosphere. There is more carbon dioxide...
Tuesday, October 27, 2015 by Sandra

Science
What is the lowest atmosphere on earth?
Tuesday, October 27, 2015 by Chuang

maths 3 advanced
an experimental satelite is placed into a polar ellipical orbit above the earth. both its apogee and perigee are above the equator and the earths centre is the focus of the ellipical orbit. the earths radius is taken ar 6000km. the furthest point of the satellites orbit is ...
Tuesday, October 27, 2015 by max

Is this right Ms Sue ???
through their study on earth, geographers learn how earth and its people affect ? human health the solar system each other political systems***
Monday, October 26, 2015 by lilly

please check my answer!!!
through their study on earth, geographers learn how earth and its people affect ? human health the solar system *** each other political systems
Monday, October 26, 2015 by lilly

geography..please check my answers!!!
which pair of basic questions guides geographers in their work? where are things located? and Why are they there? **** What is the climate? and Why was it changed? When did Earth form? and What is it made of? Who lived where? and When did they move?
Monday, October 26, 2015 by lilly

English
Choose the answer that best matches the word "millennia" For many millennia, people believed Earth was flat. reasons thousands of years*** generations of people beliefs or propositions *** - My Answer
Monday, October 26, 2015 by Kaai97

physics
how much energy is required to move a 1000kg object from the Earth's surface to an altitude twice Earth's radius?
Monday, October 26, 2015 by ling

Chemistry
the distance from the sun to earth is 1.496 x10 ^8 km. how long does it take light to travel from the sun to earth How do you solve this?
Sunday, October 25, 2015 by Mark

astronomy
The Keck telescope on Mauna Kea has an angular resolution on Earth of half an arcsecond. How far away (in meters) could you read ("resolve the letters of") a book with 3 mm square type, using the Keck telescope on Earth?
Sunday, October 25, 2015 by Titos

physics
a solar panel is 12% efficient at converting sunlight into electrical energy.on average the sunlight that strikes the earth's surface has an intensity of 250 w/m^2 which of the following is the best estimate for the area of the solar panel needed to provide 1.2Kw of energy...
Sunday, October 25, 2015 by iffat

astronomy
The luminosity of the Sun is 4*10^33 erg/s, and its radius is 7*10^10 cm. What is the flux of sunlight on the Earth? i answer flux = luminosity/4pi*d^2 = 4*10^33/4pi*49*10^20=.....0,0064994151*1​0^13=6.49*10^10 erg/cm^2/sec thank you .please help me...
Saturday, October 24, 2015 by Tsambikos

astronomy
A geosynchronous satellite is a satellite whose orbital period matches the rotation of the Earth. Calculate the height above the surface of the Earth which a satellite must have in order to be in a geosynchronous orbit. (Please enter your answer in units of kilometers)
Saturday, October 24, 2015 by Tsambikos

Science
Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA)What was this particular time period called? Why is this time period not really considered a part of Earth’s geologic ...
Friday, October 23, 2015 by Alexia Smith

Science
I am having trouble with this one question. Please help? (: Explain why Earth and other planets were not solid when they formed during the beginning of the Precambrian, approximately 4,600 million years ago (MYA)
Friday, October 23, 2015 by Alexia Smith

AP WORLD HISTORY TEST TODAY!!!
Man is believed to have migrated from what region of the earth? A. southeast Asia B. Iberian Peninsula C. Fertile crescent D. Indo-Europe E. Mediterranean Basin I NEED A FAST RESPONSE!! THANK YOU
Friday, October 23, 2015 by Anonymous

DMMS
Chemistry What characteristics are shared by all alkali metals and alkaline earth metals? A They conduct electricity very well B They are strong and shiny C They form alkaline solutions when mixed with water D They do not react with water at all
Thursday, October 22, 2015 by Donna

Science
Which of Earth sprees contain most of the mass?
Thursday, October 22, 2015 by Mark

Science please help :)?
3. which if the following factors determines how long a star will live ? ( 1point ) A . star’s color b. the star’s mass**** c. the star’s diameter d. the star’s distance from the sun 4 . which of the following causes constellations to appear to move ...
Wednesday, October 21, 2015 by Cami

Math2
The scale of a globe is 1/8 inch= 125 miles. How many inches is the circumference of that globe? Hint 1: Circumference means distance around. Hint 2: Use 25,000 miles for the circumference of the Earth.
Wednesday, October 21, 2015 by DK

astronomy
The orbit of the comet Encke has a perihelion distance of 0.331 AU and an eccentricity of 0.850. Suppose that the arrival of the comet at its perihelion distance happens to occur at a point directly in line between the Sun and the Earth. Roughly how many years will it be ...
Wednesday, October 21, 2015 by ev

Trig
mercury rotates around the sun in approx. 89 earth days (or 7,689,600 s. use a calculator to approximate its angular speed. choices: 4.09x10^-7 0.035 0.071 8.17x10^-7
Wednesday, October 21, 2015 by Bill

Earth Science
Which of the following is not a process that forms metallic ore? placer deposits *** fossil compaction hydrothermal solutions igneous processes 5. Which of the following nonmetallic mineral resources is used both as a building material and as an industrial mineral? sulfur ...
Wednesday, October 21, 2015 by Anon

SS HELP PLZ
1)Which of the following does NOT concern dividing up the earth into smaller sections? A. Parallels B. Meridian C. Cardinal Directions**** D. Hemispheres 2)Which of the five themes includes human and physical features at a specific location? A. Locations B. Place**** C. ...
Tuesday, October 20, 2015 by regan

Analytical Mechanics
a gun is fired with muzzle velocity v0 = 1000 m/s straight up along the z-axis. While moving through the air the Earth's gravity pulls on the bullet, which has mass m = 20 grams and the bullet's air resistance force can be approximated by the relationship Fresist = -cv...
Tuesday, October 20, 2015 by Ryan

Physics 101 (I'm stupid)!
And Astronaut wearing an environment suit has a total mass of 130 kg. What is his weight on earth? What would his weight be on Mars where the acceleration of gravity is 3.26? What is his mass on Mars? Why? If he should end up adrift and deep space what what his mask be? Why?
Tuesday, October 20, 2015 by Haley

Physics 101 (I'm stupid)!
And Astronaut wearing an environment suit has a total mass of 130 kg. What is his weight on earth? What would his weight be on Mars where the acceleration of gravity is 3.26? What is his mass on Mars? Why? If he should end up adrift and deep space what what his mask be? Why?
Monday, October 19, 2015 by Haley

astronomy
A geosynchronous satellite is a satellite whose orbital period matches the rotation of the Earth. Calculate the height above the surface of the Earth which a satellite must have in order to be in a geosynchronous orbit. (Please enter your answer in units of kilometers)
Sunday, October 18, 2015 by Anonymous

gaya ,college science
Which one of the following is an alkaline earth element? a) carbon b)sodium c)zinc d)iron
Sunday, October 18, 2015 by gaurav verma

Chemistry- Dr. Bob
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

Chemistry
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

Chemistry
Please check the following. 1. What compound is sodium sulfite? My answer:Na2SO3 2. Which element is a noble gas? a. N2 b. Cl2 c. Xe d. I2 My answer: c 3. Which element is most likely to form a cation with a 2+ charge? a. S b. P c. Be d. Al My answer: c 4. Which species ...
Saturday, October 17, 2015 by Anonymous

Chemistry!
1. If the distance from the earth to the moon is 3.82 x 10^8 m, how many times could the paper stack reach to the MOON AND BACK? 1 mole of papers=1.505E20
Thursday, October 15, 2015 by Myles

physics
The force of gravity on a box is 597 N on the surface of the Earth. Find the mass of the box.
Wednesday, October 14, 2015 by Nicholis

science
a crew of astronauts leaves earth on a Monday , lands on the moon on a Thursday. they and on the side of the moon facing away from the earth. on what day would the astronauts be able to see earth from the moon, explain
Tuesday, October 13, 2015 by robin a

SCIENCE
. How did planetesmals form planets? (1 point) A. They broke apart into smaller chunks. B. They collided and stuck together.** C. They cooled and pulled ice together. D. They began to rotate. 2. Which parts of the sun’s atmosphere become visible during a total solar ...
Tuesday, October 13, 2015 by Shalee ^~^

Science
1. How did planetesmals form planets? (1 point) A. They broke apart into smaller chunks. B. They collided and stuck together.** C. They cooled and pulled ice together. D. They began to rotate. 2. Which parts of the sun’s atmosphere become visible during a total solar ...
Tuesday, October 13, 2015 by Shalee ^~^

math
An ant weights about 2*10 to the fifth power pounds. There are about 1*10 to the 15 power ants on Earth. How many pounds of ants are on Earth
Tuesday, October 13, 2015 by Anonymous

science
A rock sample weight 60N on earth. what would be the weight of the same rock on moon?
Tuesday, October 13, 2015 by Lavenia

Physics
An Earth satellite moves in a circular orbit 765 km above the Earth's surface. The period of the motion is 99.9 min. (a) What is the speed of the satellite? ______ m/s (b) What is the magnitude of the centripetal acceleration of the satellite? ______m/s^2
Sunday, October 11, 2015 by Corey

Physics
A rocket has put your spacecraft in a circular orbit around Earth at an altitude of 350 km. Calculate the force due to gravitational between the Earth and the spacecraft in N if the mass of the spacecraft is 2450 kg.
Sunday, October 11, 2015 by Kay

physics
Two satellites are in circular orbits around the earth. The orbit for satellite A is at a height of 427 km above the earth’s surface, while that for satellite B is at a height of 873 km. Find the orbital speed for (a) satellite A and (b) satellite B.
Friday, October 9, 2015 by Regheim Beck

Math
If a rock falls from a height of 50 meters on​ Earth, the height H​ (in meters) after x seconds is approximately H(x)=50-4.9x^2 1. ​What is the height of the rock when x=1.6 ​seconds? 2. ​When is the height of the rock 5 meters? 3. When does the ...
Friday, October 9, 2015 by bo

english 1
Which excerpt from the passage best allows the reader to infer that the Maori people felt cared for by the earth?
Thursday, October 8, 2015 by Anonymous

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****
Wednesday, October 7, 2015 by Cami

Shalee ^~^
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 ...
Wednesday, October 7, 2015 by Shalee ^~^

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 ...
Wednesday, October 7, 2015 by Shalee ^~^

Science
Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly**** Scientists use models of natural systems because they like to use art in science. ...
Tuesday, October 6, 2015 by Shalee ^~^

math
geologists estimate that earths temperature rises about 10 degrees celsius for every kilometer k below earths surface. suppose it is 50 degrees celsius on the surface of the earth. What is the formula for the temperature t in degrees celsius at a dept of k km?
Monday, October 5, 2015 by Julia

Physics
An airplane with a speed of 82.2 m/s is climbing upward at an angle of 71.6 ° with respect to the horizontal. When the plane's altitude is 772 m, the pilot releases a package. (a) Calculate the distance along the ground, measured from a point directly beneath the point...
Monday, October 5, 2015 by Hannah

math
Find the distance btw two cities. Assume that the Earth is is a sphere of the radius 4000 miles and that the cities are the on the same longitude(one city is due north of the other).
Monday, October 5, 2015 by salma

Science
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly. Scientists use models of natural systems because they like to use art in science. ...
Sunday, October 4, 2015 by Shalee ^~^

Math
Earth is represented on a map of a portion of the solar system so that its surface is the circle with equation x squared + y squared + 8x + 6y - 3575=0. A weather satellite circles 0.4 unit above Earth with the center of its circular orbit at the center of Earth. Find the ...
Friday, October 2, 2015 by Anonymous

Physics. Interesting group question
Does Newton's laws apply on earth even though we are constantly accelerating? I thought it would be true because it would apply to the uniform circular motion wouldn't it?
Friday, October 2, 2015 by Alessandra

physics
On the Apollo 14 mission to the moon, astronaut Alan Shepard hit a golf ball with a golf club improvised from a tool. The free-fall acceleration on the moon is 1/6 of its value on earth. Suppose he hit the ball with a speed of 25 m/s at an angle 24 ∘ above the horizontal...
Thursday, October 1, 2015 by raquel

astronomy
The Keck telescope on Mauna Kea has an angular resolution on Earth of half an arcsecond. How far away (in meters) could you read ("resolve the letters of") a book with 3 mm square type, using the Keck telescope on Earth?
Thursday, October 1, 2015 by Tsambikos

Physics
A ship sets sail from Rotterdam, The Netherlands, heading due north at 5.00 m/s relative to the water. The local ocean current is 1.54 m/s in a direction 40° north of east. What is the velocity of the ship relative to the earth?
Thursday, October 1, 2015 by Taylor

Physics addition of velocities
A seagull flies at a velocity of 7.00 m/s straight into the wind. (a) If it takes the bird 17.0 min to travel 6.00 km relative to the earth, what is the velocity of the wind? (b) If the bird turns around and flies with the wind, how long will he take to return 6.00 km?
Thursday, October 1, 2015 by Marcus

Physics
A car travels due east with a speed of 40.0 km/h. Raindrops are falling at a constant speed vertically with respect to the Earth. The traces of the rain on the side windows of the car make an angle of 54.0° with the vertical. Find the velocity of the rain with respect to ...
Tuesday, September 29, 2015 by Aly

physics
every year the earth travels on its orbit about the sun. What is earth average speed in m/s, taken that the average orbital radius in 93,200,000 miles
Monday, September 28, 2015 by nichols

Science
Three major branches of earth science: Meteorology Geology Oceanography
Monday, September 28, 2015 by Sue

physics
NASA launches a satellite into orbit at a height above the surface of the Earth equal to the Earth's mean radius. The mass of the satellite is 550 kg. (Assume the Earth's mass is 5.97 1024 kg and its radius is 6.38 106 m.) (a) How long does it take the satellite to go ...
Sunday, September 27, 2015 by Kristen

physics
realation between earth gravity and moon gravity
Thursday, September 24, 2015 by kv

physics
the gravitational force on an object on the surface of the earth is F , what's the gravitational force on the satelite when at height R/20, where R is the radius of the Earth ?
Thursday, September 24, 2015 by edward

algebra
please review the questions and table and check my answers. tank you tutors. table planets' orbital velocity planet orbital velocity (mi/s) mercury 29.74 venus 21.76 earth 18.5 mars 14.99 jupiter 8.12 saturn 6.02 uranus 4.23 solve. show your work. express the answer in ...
Thursday, September 24, 2015 by anon

history
1. The Inca's huge empire was located in which mountain chain? (1 point) A. Rocky Mountains B. Alps C. Andes----- D. Amazons 2. The Incan people believed their emperor was related to whom? (1 point) A. Cuzco B. Quipo C. the god of Earth D. the sun­god----- 3. All of ...
Monday, September 21, 2015 by SERENA

earth science
Stellar evolution is the life cycle of a star. A cycle suggests that upon death of a star, another star is born. How is this possible? Stars never really die. The death is a black dwarf star. This type of death triggers the birth of a new star. The death is a red giant. This ...
Friday, September 18, 2015 by korey

Science
Find the gravitational acceleration if a spaceship at a distance equal to double of earth's radius from the centre of the earth (g on earth is 9.8 m/s)
Friday, September 18, 2015 by Gautam pandey

astronomy
If you drop a feather and a steel hammer at the same moment, they should hit the ground at the same instant. Why doesn’t this work on Earth, and why does it work on the Moon? Will it work on Phobos, a moon of Mars?
Thursday, September 17, 2015 by nilmar

Physics
the weight of the body on the surface of earth is 392N what will be the weight of this body in another body whose mass is double of earth mass and radius is fourth multiple of earth radius?
Wednesday, September 16, 2015 by Priyank

English
Will someone assist me in answering the first question below? Once I figure out an answer for the first question, I should be able to answer the other two. "Hobbits are an unobtrusive but very ancient people, more numerous formerly than they are today; for they love peace...
Tuesday, September 15, 2015 by Victoria

physics
Light from the Sun reaches Earth in 8.3 min. The speed of light is 3.00 x 10^8 m/s. How far is Earth from the Sun?
Tuesday, September 15, 2015 by katie

math/science
The total surface area of Earth is about 1.97 × 10^8 square miles. The surface area of land on Earth is about 5.73 × 10^7 square miles. Find the ratio of surface area of land to that of the entire planet.
Sunday, September 13, 2015 by .

Chemistry (Check)
Q: Name the group that has a general electron configuration of ns^2 and provide an example of an atom with this general configuration. A: Alkaline Earth Metals and Beryllium [He] 2s^2 Q: Name the group that has a general electron configuration of ns^2np^6 and provide an ...
Sunday, September 13, 2015 by Anonymous

Physics
how are the fundamental laws and principles of physics related to the complexity that we see in nature? 2) How do the laws of physics apply to other sciences such ad biology, chemistry, and earth science? Give a specific example to show the connection - is it because there ...
Sunday, September 13, 2015 by anonymous

PHYSICS
An object weighs 480 N on earth. What would its weight be on a planet whose mass is twice the mass and ratio of the earth?
Sunday, September 13, 2015 by NotYourTyn

PHYSICS
An object weighs 480 N on earth. what would its weight be on a planet whose mass is twice the mass and half the ratio of the earth?
Saturday, September 12, 2015 by Princess Blabla

maths
Two places on the same meridian have latitudes 10 degree south and 53 degree north. What is their distance apart measured along the meridian?(radius of the earth R=6400km,pi=22/7)
Friday, September 11, 2015 by precious

Physics. Help Please
Gabriele enters an east-w straight bike path at the 3.0-km mark and rides w at a constant speed of 8.0 m/s. At the same time, Xena rides east from the1.0-km mark at a constant speed of 6.0 m/s. 1. Write function x(t) that describe the position of Gabriele as a function of time...
Friday, September 11, 2015 by Matt

Physics Using hydrostatic equilbrium)
3. A model of Earth’s interior: Look up the radius and mass of the Earth. Radius is 6,371 km Mass is 5.974 x 10^24 kg Calculate its average density. p_e = (5.974 x 10^24 kg)/ (4/3)pi r^3 = (5.974 x 10^24 kg)/ (4/3)pi (6371)^3 = 5.54 g/cm^3 Using this Imagine a planet of ...
Thursday, September 10, 2015 by Jason

Physics ( using earth to find pressure of planet y
3. A model of Earth’s interior: Look up the radius and mass of the Earth. Radius is 6,371 km Mass is 5.974 x 10^24 kg Calculate its average density. p_e = (5.974 x 10^24 kg)/ (4/3)pi r^3 = (5.974 x 10^24 kg)/ (4/3)pi (6371)^3 = 5.54 g/cm^3 Imagine a planet of the same ...
Thursday, September 10, 2015 by Kim

Physics- Relativity
A lighthouse sweeps its beam of light around in a circle once every 7.2 s. To an observer in a spaceship moving away from Earth, the beam of light completes one full circle every 9 s. What is the speed of the spaceship relative to Earth
Wednesday, September 9, 2015 by John

math
How big is the sun compared to earth.
Tuesday, September 8, 2015 by mya

Physics
Two trains approach each other on parallel tracks. Each has a speed of 20.0 km/hr with respect to the earth. If they are initially 18.0 km apart, how long (in seconds) will it be before they pass each other?
Saturday, September 5, 2015 by Keya

Physics
The weight of an astronaut plus his space suit on the Moon is only 270 N. A. How much do they weigh on Earth, in Newtons, assuming the acceleration due to gravity on the moon is 1.67m/s^2= 1584is this right? B. What is the mass of the astronaut and his space suit on the moon ...
Wednesday, September 2, 2015 by Flo

science
A boy runs a 100meter distance race in 20seconds as measured by an observer on earth.how long does it take according to an observer in space ship moving with speed of 0.98c for the boy to complete the run? What is the length of the track according to the moving observer?
Wednesday, September 2, 2015 by euro

physics(relativity)
A boy runs a 100m distance in 20s as measured by an observer on earth.how long does it take according to an observer in space ship moving with speed of 0.98c for the boy to complete the run? What is the length of the track according to the moving observer
Wednesday, September 2, 2015 by ebraheem

Science
1. Why do scientists use models of natural systems? (1 point) Scientists use models of natural systems because these systems are often too large, too small, or too complex to study directly.*** Scientists use models of natural systems because they like to use art in science. ...
Monday, August 31, 2015 by Anonymous

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Homework Help: Science