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April 20, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

Post a New Question | Current Questions

Science
If there was zero change in Earth’s eccentricity, how might that affect the possibility of an ice age?
Friday, March 1, 2013 at 12:52pm

Physics
Work is definitely not zero for launching a satellite. The kinetic energy must increase to reach orbital velocity. The potential energy also increases because you are raising it farther above the Earth's surface. The formula Epi = -G*m1*m2/R can be used for the potential ...
Friday, March 1, 2013 at 7:31am

physics
It will depend upon the longitude where he is standing. The velocity of a person at the equator, in an Earth-fixed coordinate system, is V = 2*pi*6.37*10^6 m/(24*3600 sec) = 463 m/s Use that velocity with the formula for kinetic energy, (1/2)MV^2
Friday, March 1, 2013 at 7:19am

physics
What is the orbital radius and speed of a synchronous satellite which orbits the earth once every 24h?
Friday, March 1, 2013 at 4:42am

physics
Help me solve this physics homework: in sense we all have kinetic energy,even when we are standing still.the earth with a radius of 6.37*10power6 m,rotates about its axis once a day.ignoring the earths rotation about the sun,what is the K.E of a 50Kg man standing on the ...
Friday, March 1, 2013 at 2:14am

Physics
A projected space station consists of a circular tube that is set rotating about its center (like a tubular bicycle tire) as shown in figure below. The circle formed by the tube has a diameter of about D = 1.28km. What must be the rotation speed (in revolutions per day) if an ...
Friday, March 1, 2013 at 12:12am

Physics
For launching a satellite into orbit around earth, would the proper conservation of energy formula be: Epi + Eki + O work = Epf + Ekf? Would work = 0 for launching a satellite? And, would Epi = -Gm1m2/radius of earth or would it just equal 0 (because we usually set Ep on earth...
Thursday, February 28, 2013 at 10:17pm

Physics!!!!
Assume that a scale is in an elevator on the earth. What force would the scale exert on a 53 kg person standing on it when the elevator slows at 1.77 m/s2 while moving upward?
Thursday, February 28, 2013 at 7:30pm

Physics
The Moon is about 3.8e5 km from the Earth. Find its average orbital speed about the Earth.
Thursday, February 28, 2013 at 9:21am

Physics
Calculate the speed in m/s at which Earth revolves about the Sun. You may assume the orbit is nearly circular.
Thursday, February 28, 2013 at 9:20am

Creative writing
Does it make sense to say that someone was "spiraling towards the earth at breakneck speed" or should I pick a better word than spiraling? Any suggestions?
Thursday, February 28, 2013 at 8:26am

Physics
Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
Wednesday, February 27, 2013 at 11:53pm

Physics
In the figure below, a small block of mass m = 0.034 kg can slide along the frictionless loop-the-loop, with loop radius 8 cm. The block is released from rest at point P, at height h = 7R above the bottom of the loop. (For all parts, answer using g for the acceleration due to ...
Wednesday, February 27, 2013 at 8:46pm

business math
Scientists estimate forests are being destroyed on Earth's surface at a rate of 149 acres per minute. Use unit ratios to find the number of acres to the nearest thousand being destroyed each day. I am completely stumped on this one. HELP!
Wednesday, February 27, 2013 at 2:16pm

Ms. Sue please help
http://www.windows2universe.org/earth/At​mosphere/exosphere_temperature.html
Wednesday, February 27, 2013 at 11:54am

PHYSICS!!!
Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
Wednesday, February 27, 2013 at 3:38am

science
The temperature within the exosphere varies, depending on whether you are looking at the "day" side of the Earth, or the "night" side of the Earth. Because the atmospheric molecules are so disperse at this altitude, their energy is related to the amount of ...
Wednesday, February 27, 2013 at 12:11am

Science 8R - HELP!
http://science.nationalgeographic.com/sc​ience/earth/the-dynamic-earth/weathering​-erosion-article/
Tuesday, February 26, 2013 at 7:48pm

Electromagnetic spectrum
Some astronomical objects emit no visible light but are known through (blank?) and radio images; satellite observations (blank?) Earth's atmosphere help scientists study space at wavelengths that do not reach Earth's surface?
Tuesday, February 26, 2013 at 6:49pm

Science
Can you tell me the Main Idea(s)? There’s an old saying that oil and water don’t mix. But sometimes they do — especially when a chemical called a surfactant brings the two together. Once blended, oil and water become tough to pull apart. Unless, that is, you ...
Tuesday, February 26, 2013 at 4:51pm

Science ASAP
Can you tell me the Main Idea(s)? There’s an old saying that oil and water don’t mix. But sometimes they do — especially when a chemical called a surfactant brings the two together. Once blended, oil and water become tough to pull apart. Unless, that is, you ...
Tuesday, February 26, 2013 at 4:16pm

phYSICS!!!
Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
Tuesday, February 26, 2013 at 11:28am

Physics
The radius of the earth is 6.37*10^6 m and its mass is 5.975*10^24 kg. Find the earth's average density to appropriate significant figure.
Tuesday, February 26, 2013 at 10:57am

Physics
The radius of the earth is 6.37*10^6 m and its mass is 5.975*10^24 kg. Find the earth's average density to appropriate significant figure.
Tuesday, February 26, 2013 at 10:49am

Physics
The radius of the earth is 6.37*10^6 m and its mass is 5.975*10^24 kg. Find the earth's average density to appropriate significant figure.
Tuesday, February 26, 2013 at 10:48am

Physics
The radius of the earth is 6.37*10^6 m and its mass is 5.975*10^24 kg. Find the earth's average density to appropriate significant figure.
Tuesday, February 26, 2013 at 10:48am

science
find the theoreticval value of the period of a pendulum of length 0.9 meters located on the surface of the earth.
Tuesday, February 26, 2013 at 10:18am

physics
For a safe re-entry into the Earth's atmosphere the pilots of a space capsule must reduce their speed from 2.6 104 m/s to 1.0 104 m/s. The rocket engine produces a backward force on the capsule of 1.7 105 N. The mass of the capsule is 3800 kg. For how long must they fire ...
Monday, February 25, 2013 at 9:08pm

Physics
A small compass is held horizontally, the center of its needle a distance of 0.460 m directly north of a long wire that is perpendicular to the earth's surface. When there is no current in the wire, the compass needle points due north, which is the direction of the ...
Monday, February 25, 2013 at 5:27pm

English - The Lovely Bones
I asked this question yesterday but no one has answered thus far so I thought I'd try asking again: If anyone has read The Lovely Bones novel could you please explain 2 things to me. 1) Is Ruth Connors able to see the dead? When she moves to NYC she writes about all the ...
Monday, February 25, 2013 at 4:15pm

health
Please think again. http://kids.earth.nasa.gov/archive/air_p​ressure/index.html
Monday, February 25, 2013 at 12:54pm

physics
Recently, Asteroid 2012 DA14 came within 34,200 km from the center of the earth at its point of closest approach. If the moon goes around the earth once every 27.5 days, what is the ratio of the distance of closest approach of DA14 to the radius of the orbit of the moon?
Monday, February 25, 2013 at 11:56am

The Lovely Bones
If anyone has read this novel could you please explain 2 things to me. 1) Is Ruth Connors able to see the dead? Like when she moves to NYC she writes about all the murdered women she finds. How does she go about doing that? Can see she Susie too? 2) How is Buckley able to see ...
Sunday, February 24, 2013 at 2:35pm

Physics
A spaceship of mass 175,000 kg travels from the Earth to the Moon along a line that passes through the center of the Earth and the center of the Moon. At what distance from the center of the Earth is the force due to the Earth twice the magnitude of the force due to the Moon? ...
Sunday, February 24, 2013 at 12:35pm

Physics
3. A spaceship of mass 175,000 kg travels from the Earth to the Moon along a line that passes through the center of the Earth and the center of the Moon. At what distance from the center of the Earth is the force due to the Earth twice the magnitude of the force due to the ...
Sunday, February 24, 2013 at 12:34pm

Geography
http://earth.rice.edu/mtpe/hydro/hydrosp​here/hydrosphere_what.html
Saturday, February 23, 2013 at 7:29pm

science
The atmospheres of Mars and Venus are mostly carbon dioxide. Earth’s atmosphere contains only a fraction of a percent of carbon dioxide. Why is Earth’s atmosphere so different from those of Mars and Venus?
Saturday, February 23, 2013 at 7:03pm

Earth Science
correct
Saturday, February 23, 2013 at 3:26pm

Earth Science
Which organism evolved before the others in geologic time? mammals amphibians reptiles **fish Which type of organism evolved later than the others? **mammals amphibians reptiles fish
Saturday, February 23, 2013 at 2:39pm

Science
What units of measurement do you use to measure the earth to... 1. Moon 2. Galaxy 3. Sun 4. Communication satellite 5. Pluto 6. Proxima Centauri
Saturday, February 23, 2013 at 1:07pm

Science
in what ways do you think earth's moon may be similar to mercury
Saturday, February 23, 2013 at 9:26am

physics
How fast is a city on the earth's equator (such as Singapore) moving due to our planet's daily spin on its axis?
Saturday, February 23, 2013 at 12:00am

science
The acceleration of gravity on the surface of Venus is 8.9m/s^2. Would a ball thrown upward on Venus return to the ground sooner or later than a ball thrown upward with the same speed on the earth?
Friday, February 22, 2013 at 11:32pm

College Physics
Find the magnitude of the magnetic flux through the floor of a house that measures 21m by 13m . Assume that the Earth's magnetic field at the location of the house has a horizontal component of 2.4×10−5 T pointing north, and a downward vertical component of 4.3...
Thursday, February 21, 2013 at 7:26pm

science
(a) Since the acceleration of gravity at the surface is proptional to M/R^2, it's value on the moon is (1/80)*4^2 = 16/80 or 1/5 of the value on Earth. The actual value is closer to 1/6. Weight = (1/5) M*g, where M = 50 kg and g -= 9.8 m/s^2 (b) Three moon radii from the ...
Thursday, February 21, 2013 at 4:37pm

science
The moon is the earth's nearest neighbor in space the radius of the moon is approximately one quarter of the earth's radius and it's mass is one eightieth of the earth's mass.(a)calculate the weight of an object with a mass of 50.0kg on the surface of the moon...
Thursday, February 21, 2013 at 4:21pm

science
A man has a mass of 80.0kg is standing on the surface of the earth.(a)calculate the magnitude of the attractive force that the earth exerts on the man
Thursday, February 21, 2013 at 2:02pm

Earth Science
Now, I think it might be Potassium.. I just saw anothr post with K -40 has a half life of approx. 1.25 billion years.
Thursday, February 21, 2013 at 9:19am

Earth Science
You want a long half-life for older rocks. I think it may be argon, but you need to lookup the half-lives of each of them. You can probably google it.
Thursday, February 21, 2013 at 9:18am

Earth Science
Why is potassium-argon dating most applicable to dating very old rocks? potassium’s long half-life potassium’s short half-life argon’s long half-life argon’s short half-life
Thursday, February 21, 2013 at 12:09am

Physics
A satellites are placed in a circular orbit that is 1.62 × 108 m above the surface of the earth. What is the magnitude of the acceleration due to gravity at this distance?
Wednesday, February 20, 2013 at 10:55pm

physics
Assume the Earth's magnetic field is 51.3 µT northward at 60.0° below the horizontal in a particular city. A tube in a neon sign stretches between two diagonally opposite corners of a shop window—which lies in a north–south vertical plane—and ...
Wednesday, February 20, 2013 at 9:42pm

Earth Science
It seems to be asking about the original state.
Wednesday, February 20, 2013 at 3:45pm

Earth Science
Which geologic principle states that if rock strata are found folded or faulted, the folding or faulting occurred after they were deposited? faunal succession uniformitarianism original horizontality cross-cutting relationships Uniformitarianism does not sound right at all for...
Wednesday, February 20, 2013 at 2:42pm

electronic medical -- CHEAT!
Are you kidding? You want a career in a medical office and don't want to learn how to do this job? Who on earth would hire a cheat?
Wednesday, February 20, 2013 at 12:48pm

physics
We are stuck to the earth and we are so small by comparison, it is the only effect we feel. If the world suddenly stopped, the people on the leading side would fly off, in freefall, til the mass of the earth pulled them back down, unless they had escape velocity...
Wednesday, February 20, 2013 at 4:49am

reading
According to science, the fastest speed possible for anything is the speed of light. The speed of light is about 186,000 miles per second. That means that in one minute, light travels 11,160,000 miles. The star nearest Earth is the Sun. It's about 93,000,000 miles from ...
Tuesday, February 19, 2013 at 7:47pm

Science
1. Scientists hypothesize that the sun formed ____. (1 point) (0 pts) less than a billion years ago (1 pt) from a cloud of gas and dust (0 pts) less than a million years ago (0 pts) from a chunk of Jupiter 1 /1 point 2. Two of the inner planets are ____. (1 point) (0 pts) ...
Tuesday, February 19, 2013 at 3:03pm

english
Instructions: Read each passage carefully. Classify each underlined word(s) as a noun (N), pronoun (PN), verb (V), adjective (A), adverb (AV), conjunction (C), preposition (P), prepositional phrase (PP). Be sure to use the abbreviation and not the full word when inputting your...
Tuesday, February 19, 2013 at 2:02pm

Science
Please check my answers? My textbook won't load, so i've had to use google and guess. 1. Scientists hypothesize that the sun formed ____. (1 point) less than a billion years ago **from a cloud of gas and dust less than a million years ago from a chunk of Jupiter 2. Two...
Tuesday, February 19, 2013 at 1:25pm

phy
A spy satellite is in circular orbit around Earth. It makes one revolution in 6.01 hours. how high above earth? acceleration?
Tuesday, February 19, 2013 at 9:58am

GEOGRAPH
Both are used to figure out where one is on this earth. One is north-south; one is east-west. How will you explain all this for your assignment?
Tuesday, February 19, 2013 at 7:29am

Physics
Planet Earth as a Spring. Assume that the Earth is perfect sphere of mass M=5.98x10^24kg, radius 6,370km, and uniform density. Imagine a long, straight tunnel through the center of the Earth, connecting the North and South poles . A capsule of mass m is dropped into this ...
Tuesday, February 19, 2013 at 1:04am

Earth Science
I bet you can find it by doing a google search.
Monday, February 18, 2013 at 4:49pm

Earth Science
Give an example of an organic non-clastic sedimentary rock, a chemical non-clastic sedimentary rock, and a clastic sedimentary rock. Can anyone provide me with those examples, please?
Monday, February 18, 2013 at 4:45pm

physics!
Recently, a meteor impacted Russia. The estimate of the meteor's size was 10 tons and it was estimated to have entered the earth's atmosphere at a speed of 14,600 m/s. What was the total kinetic energy of such a meteor in J as it entered the atmosphere?
Monday, February 18, 2013 at 1:04am

Math
What is the maximum broadcasting from a radio tower 1800 feet tall( approximately 0.34 mile)? The radius of Earth is approximately 3960 miles, and you can assume the ground around the tower is nearly flat. Round your answer to the nearest 10 miles.
Saturday, February 16, 2013 at 5:34pm

physics
A hang glider is travelling horizontally at 13 m/s and is located 326 m above the surface of the earth. Suddenly and accidentally a water bottle falls from it. How far will the water bottle travel horizontally?
Saturday, February 16, 2013 at 3:45pm

physics
KE=1/2 *600*v^2 convert 2500km/hr to m/s Now on PE, I am troubled by your graviational field. You list it as constant, however, if it is relative to earth, that field changes nearer Earth, by a significant factor, so PE relative to Earth is more than a constant field would ...
Friday, February 15, 2013 at 10:50am

physics
An artificial sattelite as a mars of 600 kg and moving towards moon.calculate its kinetic energy and potential energy in mJ relative to the earth when it is 50 km from launching and moving at 2500 km/h take acceleration of earth gravitational field as 790 cm/s*s
Friday, February 15, 2013 at 5:46am

science
space doesn't change your weight. weight is just a measure of the force attracting you to a planet or moon or other body. If you are in space, you are farther from the earth, so it exerts less force on you. Hence, you weigh less. Actually, your weight is only felt if there...
Thursday, February 14, 2013 at 5:51pm

physics
You are lying on the beach on a tropical island on the equator, watching the Sun set - what a beautiful scene! Immediately after the top of the Sun disappears, you stand up to watch the Sun set again. After the amount of time t=10 s the top of the Sun disappears again. Given ...
Thursday, February 14, 2013 at 2:21am

Physics
If a small planet were located 7 times as far as the Earth's distance from the Sun, it period is ___ earth years?
Thursday, February 14, 2013 at 12:20am

Science 8R - help....!!!!
In a solar eclipse, the moon covers all or (usually) part of the sun. If the whole sun is covered, it is cal;led a total solar eclipse. The next total eclipse in the United States will occur in 2017. The last ones were in 1979 and 1991 (Hawaii only). In a lunar eclipse, all or...
Wednesday, February 13, 2013 at 8:13pm

Physics
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 ...
Wednesday, February 13, 2013 at 7:59pm

World history; Check:P
Spain's Empire Assignment Why did absolute monarchs believe that they were justified in exercising absolute power? Absolute monarchs believed in divine right, the idea that God created the monarchy and that the monarch acted as God’s representative on earth. How did ...
Wednesday, February 13, 2013 at 2:05pm

English
What on earth have you learned about introductory phrases and clauses?
Wednesday, February 13, 2013 at 1:08pm

physics!!!!!!!!!!!!!!!!!
A few years ago, a movie came out about a soldier, John Carter, who was transported to Mars and could perform amazing feats of strength and jumping due to the lower Martian gravity. The surface gravity of Mars is 0.38 times that of earth. If John could lift 100 kg on earth (...
Wednesday, February 13, 2013 at 12:06pm

Physics
The period of the earth around the sun is 1 year and its distance is 150 million km from the sun. An asteroid in a circular orbit around the sun is at a distance 475 million km from the sun. What is the period of the asteroid’s orbit? Answer in units of year
Tuesday, February 12, 2013 at 6:43pm

physics
A spacecraft is on a journey to the moon. At what point, as measured from the center of the earth, does the gravitational force exerted on the spacecraft by the earth balance that exerted by the moon? This point lies on a line between the centers of the earth and the moon. The...
Tuesday, February 12, 2013 at 4:27pm

PHYSICS
A few years ago, a movie came out about a soldier, John Carter, who was transported to Mars and could perform amazing feats of strength and jumping due to the lower Martian gravity. The surface gravity of Mars is 0.38 times that of earth. If John could lift 100 kg on earth (...
Tuesday, February 12, 2013 at 11:50am

science helppp.
4. Small pieces of rock that enter Earth's atmosphere at speeds of 15 to 70 km/s and burn up are called ____. (1 point) stars meteors meteorites asteroids
Monday, February 11, 2013 at 10:08pm

science
1. Scientists hypothesize that the sun formed ____. (1 point) less than a billion years ago from a cloud of gas and dust less than a million years ago from a chunk of Jupiter 2. Two of the inner planets are ____. (1 point) Venus and Saturn Mars and Venus Earth and Pluto ...
Monday, February 11, 2013 at 9:32pm

Physics
Situation: While holding his rifle at shoulder-level, a 1.8 meter tall hunter accidentally discharges it straight up into the air. Questions: 1) If the bullet exits the barrel of the rifel at 200 meters per second squared, how many seconds does the hunter have to "step ...
Monday, February 11, 2013 at 5:05pm

physics
A few years ago, a movie came out about a soldier, John Carter, who was transported to Mars and could perform amazing feats of strength and jumping due to the lower Martian gravity. The surface gravity of Mars is 0.38 times that of earth. If John could lift 100 kg on earth (...
Monday, February 11, 2013 at 11:34am

Physics Conservation of Energy
During a rockslide, a 740 kg rock slides from rest down a hillside that is 500 m long and 300 m high. The coefficient of kinetic friction between the rock and the hill surface is 0.18. (a) If the gravitational potential energy U of the rock-Earth system is set to zero at the ...
Sunday, February 10, 2013 at 6:18pm

Physics Conservation of Energy
During a rockslide, a 740 kg rock slides from rest down a hillside that is 500 m long and 300 m high. The coefficient of kinetic friction between the rock and the hill surface is 0.18. (a) If the gravitational potential energy U of the rock-Earth system is set to zero at the ...
Sunday, February 10, 2013 at 5:10pm

ap chemistry
Your 13 questions that show no work or effort on your part make me wonder why on earth you're taking AP chemistry. We call it homework dumping.
Saturday, February 9, 2013 at 8:02pm

College Physics
bobpursley's answer is wrong. The question isn't a satellite revolving earth anyways.
Saturday, February 9, 2013 at 6:58pm

Oceanography
why on the world average. Earth’s. atmosphere is in motion. Take into consideration the distribution of earth’s surface area with latitude and the variation in heat loss and heat gain with latitude.
Saturday, February 9, 2013 at 9:36am

PHYSICS 2
Near San Francisco, where the vertically downward component of the earth's magnetic field is 6.8 x 10-5 T, a car is traveling forward at 17 m/s. The width of the car is 2.1 m. Find the emf induced between the two sides of the car. If positive charge accumulates on the ...
Friday, February 8, 2013 at 8:03pm

science
Hi...I am having trouble on one last science question. Which statement supports the fact that Earth rotates about its axis from West to East? a. only one face of the moon is visible from earth b. the moon's phases change every day over the course of 29 days c. the moon ...
Friday, February 8, 2013 at 5:42pm

Physics
1An object is thrown upward at an initial velocity and caught at the same level as it was thrown. What should the maximum height be if the hang time is 6.4? (please report numerical value to 2 decimal places- unit will not be necessary to report) 2An object is thrown upward at...
Friday, February 8, 2013 at 3:02pm

Physics
An elevator is lifted up by a thick steel cable. While the elevator is moving upwards with a decreasing velocity, a. the upward force on the elevator by the cable is greater than the downward force of the Earth b. the amount of upward force due to the cable is equal to the ...
Friday, February 8, 2013 at 2:57pm

physics ^^^^^^^^^
Near San Francisco, where the vertically downward component of the earth's magnetic field is 6.8 x 10-5 T, a car is traveling forward at 17 m/s. The width of the car is 2.1 m. Find the emf induced between the two sides of the car. If positive charge accumulates on the ...
Thursday, February 7, 2013 at 11:21pm

physics
The drawing (not to scale) shows one alignment of the sun, earth, and moon. The gravitational force SM that the sun exerts on the moon is perpendicular to the force EM that the earth exerts on the moon. The masses are: mass of sun = 1.99 1030 kg, mass of earth = 5.98 1024 kg, ...
Thursday, February 7, 2013 at 10:53pm

Physics
A person can jump a maximum horizontal distance (by using a 45 degree projectile angle) of 3 m on Earth. The acceleration of gravity is 9.8 m/s2. What would be his maximum range on the Moon, where the free-fall acceleration is g/6 ? Answer in units of m
Thursday, February 7, 2013 at 4:28pm

SS
Relative position of Earth, sun, and moon.
Thursday, February 7, 2013 at 3:58pm

Physics
A person can jump a maximum horizontal distance (by using a 45 degree projectile angle) of 3 m on Earth. The acceleration of gravity is 9.8 m/s2. What would be his maximum range on the Moon, where the free-fall acceleration is g/6 ? Answer in units of m
Thursday, February 7, 2013 at 3:54pm

SS
The water for Earth’s oceans originally came from ____.
Thursday, February 7, 2013 at 3:53pm

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