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April 16, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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Physics
Magnetic field of the current-carring wire at distance b from it is B=1/2πb If B=B(Earth)/3= 5•10⁻⁵/3 T, I=2πbB= 2π•0.3•5•10⁻&#​8309;/3 = …
Sunday, March 24, 2013 at 5:19pm

Physics
In Oersted's experiment, suppose that the compass was 0.30 m from the current-carrying wire. If a magnetic field of 1/3 the Earth's magnetic field of 5 10−5 T was required to give a noticeable deflection of the compass needle, what current must the wire have ...
Sunday, March 24, 2013 at 3:02pm

Physics
1. At what height above the earth is the free-fall acceleration 30% of its value at the surface? 2. What is the speed of a satellite orbiting at that height?
Sunday, March 24, 2013 at 11:03am

Earth and Space Science
A galaxy is millions of light years away o.O
Sunday, March 24, 2013 at 8:18am

Tides
The moon and the sun, in that order. The moon is most important. The sun's tidal effect is about 44% as large as the moon's. The alignment of sun, moon and earth determines tidal range . Highest and lowest tides occur close to full and new moon.
Sunday, March 24, 2013 at 6:44am

Earth and Space Science
I agree with Shaniqua's order of size. The heads of comets are smaller than planets, but comparable to asteroids. If you include the length of their visible tails, comets are larger than planets. The tails are nothing but dust and gas, however. You only see them when the ...
Sunday, March 24, 2013 at 6:37am

Earth and Space Science
Largest to smallest is: a, b, e, d, c, f. It really depends on how big the comets and planets and moons are, though. :)
Sunday, March 24, 2013 at 5:32am

Tides
What astronomical bodies are most responsible for the tides on earth?
Sunday, March 24, 2013 at 3:01am

cycles of matter (life science)
I sincerely hope this is not in your textbook, there is some hope for education if it is not. Cycles in nature has to do with how Earth systems renews itself...sort of...but all those cycles require energy input from outside..such as solar energy. Law of Matter and Energy ...
Sunday, March 24, 2013 at 12:11am

Earth and Space Science
Moon is pretty close.
Saturday, March 23, 2013 at 11:23pm

Earth and Space Science
which is closer to earth a moon or galaxy?
Saturday, March 23, 2013 at 10:09pm

Earth and Space Science
f, c, d, e, b, a
Saturday, March 23, 2013 at 10:03pm

Earth and Space Science
Put the following astronomical bodies in order from largest to smallest: a. Universe b. Galaxy c. Moon d. Planet e. Solar System f. Comet
Saturday, March 23, 2013 at 9:47pm

physics
Calculate the magnitude of the gravitational force between the Earth and an m = 6.00 kg mass on the surface of the Earth. The distance to the center of the Earth from the surface is 6.37×103 km and the mass of the Earth is 5.98×1024 kg. B)Calculate the magnitude of...
Friday, March 22, 2013 at 2:30pm

physics/math
Calculate the magnitude of the gravitational force between the Earth and an m = 6.00 kg mass on the surface of the Earth. The distance to the center of the Earth from the surface is 6.37×103 km and the mass of the Earth is 5.98×1024 kg.
Friday, March 22, 2013 at 2:25pm

physics
a river flows due south with a speedof 2.0m/s.a man steers a motorboat across the river:his velocity relative to the river is 4.2m/s due east.the river is 800m wide.what is his velocity relative to the earth?
Friday, March 22, 2013 at 1:29pm

physics
Near San Francisco, where the vertically downward component of the earth's magnetic field is 4.7 10-5 T, a car is traveling forward at 26 m/s. The width of the car is 1.7 m. (a) Find the emf induced between the two sides of the car. V (b) Which side of the car is positive...
Friday, March 22, 2013 at 12:26pm

PHYSICS
Estimate the length of venusian year using the fact that the earth is 1.49*10'8km and venus is 1.08*10'8km from the sun on average.
Friday, March 22, 2013 at 2:11am

Earth Science
If a sample contains 70g of Carbon 14 and 70g of Nitrogen 14, how many half lives has it undergone? (show all of your work)
Thursday, March 21, 2013 at 7:41pm

physics
A strong lightning bolt transfers about 26 C to Earth. How many electrons are transferred?
Wednesday, March 20, 2013 at 10:24pm

Science ASAP
1. Drought, fewer plants, and fewer nesting sites are examples of __________. (1 point) limiting factors biotic factors abiotic factors population density 2. As you move from level to level in an energy pyramid, energy ____. (1 point) decreases increases stays at the same ...
Wednesday, March 20, 2013 at 9:07pm

physics
n anti-aircraft gun fires a 23.7 kg shell with a muzzle speed of 880 m/s. What magnitude propulsive force was necessary to attain the muzzle speed within the 5.05 m barrel? (Assume constant acceleration and neglect the Earth's gravitational effect.)
Wednesday, March 20, 2013 at 5:46pm

Biology
Eutrophication refers to 1. the concentration of a toxic substance in the tissues of organisms. 2. depletion of mineral resources as a result of leaching. 3. the warming of the earth’s surface. 4. the damage to the ozone layer that protects the earth from UV light. 5. ...
Tuesday, March 19, 2013 at 6:24pm

science
If your weight is 60 N on earths surface how far should you go from the centre of earth so that your weight will be 300 N ?(radius of earth is 4.4*10^6 m)
Monday, March 18, 2013 at 8:11am

physics
A ball whirls around in a vertical circle at the end of a string. The other end of the string is fixed at the center of the circle. Assume that the total energy of the ball-Earth system remains constant. (a) What is the tension in the string at the bottom? (Use the following ...
Monday, March 18, 2013 at 1:10am

Physics
Question: Calculate the direction of Earth's magnetic field. 3 components of the magnetic field: Geographic South to North: 0.01670 mT Geographic West to East: 0.002147 mT Up to down (up is the sky, down is the ground): 0.03722 mT Calculating angle East of North: tanθ...
Sunday, March 17, 2013 at 6:45pm

Science
How does the position of Earth's axis at the March and September equinoxes compare to its position at the summer solstice?
Sunday, March 17, 2013 at 10:37am

Science
I do not know what your word "grievuing" is supposed to mean. There are both O2 and O3 in the atmosphere. O3 (ozone) is present at very high altitudes (10-40 km) where is is produced by sunlight but simultaneosly depleted by chemical reactions involving byproducts of...
Sunday, March 17, 2013 at 8:57am

Astronomy
The first thing you should learn when studying astronomy is that it is not astrology. Astrology is not a science. Objects weigh about 1/6 as much on the moon as they do on Earth.
Saturday, March 16, 2013 at 8:38pm

science
If the acceleration due to gravity on the earth is 9.8 , what is the acceleration due to gravity on Rams?
Friday, March 15, 2013 at 2:12pm

physics
The effective value of g is inversely proportional to the SQUARE of the distance from the center of the earth. The radius of the Earth is 6378 km. At 5100 km altitude, you are 11,478 km from the center. g will lowered by a factor (6378/11478)^2 Credit to "drwl"
Friday, March 15, 2013 at 12:03am

physics
Calculate the effective value of g, the acceleration of gravity (in meters/second^2), at 5100 km above the earth's surface.
Thursday, March 14, 2013 at 11:51pm

math
Earth's mass, in kilograms, is 5.97x10^24. the moon's mass is 7.34x10^22. How many times greater is Earth's mass (in scientific notation)?
Thursday, March 14, 2013 at 6:13pm

physics
V^2/R = g*(Re/R)^2 g = 32.2 ft/s^2 Re = earth radius = 3960 miles R = orbit radius = 4460 miles = 2.355*10^7 feet Re/R = 0.888 Solve for V in ft/s V = 1.349*10^4 ft/s
Thursday, March 14, 2013 at 9:18am

physics
a 70 kg astronaut is loaded so heavily that he can jump only to a height of 10 cm on earth.how far can he jump on the moon?
Thursday, March 14, 2013 at 3:04am

earth science
http://www.windows2universe.org/earth/ge​ology/sed_intro.html
Wednesday, March 13, 2013 at 8:53pm

earth science
Which type of sedimentary rock is formed from fragments of minerals or rocks? (Points : 3) clastic chemical intrusive organic
Wednesday, March 13, 2013 at 6:57pm

Earth Science
Write a paragraph explaining the connections between plate boundaries, forces and faults.
Wednesday, March 13, 2013 at 5:46pm

Physics 11
A man jumps from a great height and falls freely to the Earth. Another man jumps from the same height 1 s later. How much are the two men separated by, 2 s after the second man jumps? I'm not sure exactly how to tackle this question. I'm sure I'm making it more ...
Wednesday, March 13, 2013 at 2:57pm

science
D is not right. Electrons move all the time around the nucleus. The travels are not in the nucleus, but they travel around. There are different theories one is that they are in orbitals like the planets around the earth. Really there is cloud of electrons moving around the ...
Wednesday, March 13, 2013 at 2:25pm

earth
http://www.enchantedlearning.com/subject​s/astronomy/planets/earth/Watercycle.sht​ml
Tuesday, March 12, 2013 at 10:15pm

earth
how does the water cycle ensure that we have water.
Tuesday, March 12, 2013 at 10:06pm

Science
Need help on the question below...I know it is not C or D The formation of metamorphic rocks depends on all of the following except a. the composition of parent rocks b. Earth's magnetic field c. temperature d. pressure Thanks
Tuesday, March 12, 2013 at 5:37pm

Physics
A 50-cm wire placed in an East-West direction is moved horizontally to the North with a speed of 2 m/s. The Horizontal and Vertical components of the earth's magnetic field at that location are 25 ìT and 50ìT respectively. What is the emf between the ends of ...
Tuesday, March 12, 2013 at 9:11am

physics
if Royce was 10 years old and he had a mass of 30kg. but by the time he turned 16 his mass has grown to 60kg. how much larger is the gravitational force between Royce and earth at age 16 compared to age 10
Monday, March 11, 2013 at 8:52pm

Science
Describe the apparent motion of the stars and planets that is caused by the revolution and rotation of the earth.
Monday, March 11, 2013 at 1:01pm

Physics
weight decreases as the square of distance, so since the weight ratio is 55.4/469 = 0.1181 the distance ratio will have to be 1/√.1181 = 2.909 so, what's 2.909 times the earth's radius?
Monday, March 11, 2013 at 10:34am

Physics
how far from the center of the earth would a person with a weight of 469N on earth have to be to have a weight off 55.4N?
Monday, March 11, 2013 at 9:45am

physics
How far from the center of the Earth must a 90 kg astronaut be in order for them to weigh 90 N? The mass of the Earth is 6 x 1024 kg.
Sunday, March 10, 2013 at 10:26pm

physics
How far from the center of the Earth must a 90 kg astronaut be in order for them to weigh 90 N? The mass of the Earth is 6 x 1024 kg.
Sunday, March 10, 2013 at 10:26pm

Physics
What is the period of a simple pendulum 83 cm long on the Earth?
Sunday, March 10, 2013 at 8:45pm

Physics
A pendulum has a period of 4.28 s on Earth. What is its period on Mars, where the acceleration of gravity is about 0.37 that on Earth?
Sunday, March 10, 2013 at 8:45pm

physics
At what height above Earth's surface is the gravitational acceleration reduced from its sea-level value by 0.60%?
Sunday, March 10, 2013 at 6:30pm

Math-geometry
I gave you the formula for area of a spherical triangle given the excess angle, and the radius of the object. re is the radius of Earth. rm is the radius of the moon.
Sunday, March 10, 2013 at 12:12am

Math-geometry
. If a spherical Triangle on Earth has an excess of 30 degrees, find the area of this spherical triangle measured in square miles. b. If a spherical triangle on the moon has an excess of 30 degrees, find the area of this spherical triangle in sqare miles. c. Find the ratio of ...
Saturday, March 9, 2013 at 11:59pm

Astronomy - Physics
Finally, we will look at a system that is in an orbit comparable to the Earth to see how the angle that the light strikes the surface and the length of day contribute to the total amount of energy that we receive from the Sun at the two solstices. Recall that the changing ...
Saturday, March 9, 2013 at 7:20pm

algebra
Scientists can determine the age of ancient objects by a method called radio carbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope 14C of carbon with a half-life of about 5710 years. Vegetation absorbs carbon dioxide ...
Thursday, March 7, 2013 at 10:39pm

Science
Certain parts of the Earth that always face the moon, or are on the opposite side from the moon, would have a permanent high tide. In between, there would be permanent low tide. There would still be seasonal variations due to the tilt of the Earth's axis. The sun would ...
Thursday, March 7, 2013 at 8:06pm

Science
how would tides be different if the moon revolves as fast as the earth rotate
Thursday, March 7, 2013 at 7:25pm

Physics-VASTS
The Mass Budget: Mars Reconnaissance Orbiter Repair Mission Operational Concept Math Problem: The Mars Reconnaissance Orbiter (MRO) has encountered a failure in its High Resolution Imaging Science Experiment (HiRISE) camera. Mission Case: As the HiRISE camera contains the ...
Thursday, March 7, 2013 at 4:29pm

POETRY, PART 2
4. Which one of the following poems depends heavily on the use of allusion for effect? A. "Death, Be Not Proud" B. "Grass" C. "Do Not Go Gentle into That Good Night" D. "God's Grandeur" 5. The theme of the poem "Richard Cory&...
Thursday, March 7, 2013 at 9:22am

Meteorology
No, the sun is never directly overhead in San Francisco. That can only happen between the tropics of Cancer and Capricorn, where the latitude's absolute value is less than 23.5 degrees (the earth's tilt angle).
Thursday, March 7, 2013 at 7:59am

History
Both. There's not much to elaborate on.As a gaeernl rule (one that has been followed for centuries), when it is cold outside, wear a coat. When it is warm outside, take the coat off.The Earth's climate has warmed and it has Cooled, many times over many millions of ...
Thursday, March 7, 2013 at 5:11am

Meteorology
Does the Sun's rays ever make 90- degree angles to the Earth's surface in San Francisco at any time during the year? Why or why not?
Thursday, March 7, 2013 at 1:12am

Physics
A proton moves eastward in the plane of Earth’s magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth’s magnetic field points north and has a magnitude of 5.2 × 10−5 T? The acceleration of ...
Wednesday, March 6, 2013 at 8:29pm

Physics
A proton moves eastward in the plane of Earth’s magnetic equator so that its distance from the ground remains constant. What is the speed of the proton if Earth’s magnetic field points north and has a magnitude of 5.2 × 10−5 T? The acceleration of gravity...
Wednesday, March 6, 2013 at 5:00pm

Geometry
a. If a spherical Triangle on Earth has an excess of 30 degrees, find the area of this spherical triangle measured in square miles. b. If a spherical triangle on the moon has an excess of 30 degrees, find the area of this spherical triangle in sqare miles. c. Find the ratio of...
Tuesday, March 5, 2013 at 7:58pm

penn foster Main ideas
Scientists generally agree that Earth is getting warmer due to what's called the greenhouse effect. A greenhouse used for plants stays warm because sunlight and heat coming through the glass roof are mostly trapped. The heat doesn't radiate back into the atmosphere ...
Tuesday, March 5, 2013 at 9:52am

PHYSICS
explorers in the jungle find an ancient monument in the shape of a large isosceles triangle. the monument is made from tens of thousands of small stone blocks of density 3 800 kg/m^3. the monument is 15.7 m high and 64.8 m wide as its base and is everywhere 3.6m thick from ...
Tuesday, March 5, 2013 at 9:15am

physics
In the figure, a frictionless roller coaster car of mass m = 672 kg tops the first hill with speed v0 = 19.4 m/s at height h = 34.7 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational ...
Monday, March 4, 2013 at 6:47pm

earth science
how did oxygen come to make up 21 percent of earth present atmosphere.
Monday, March 4, 2013 at 6:02pm

Earth Science
Which horizons are composed of unweathered rocks, weathered rocks, young soil, and q well-developed soil?
Sunday, March 3, 2013 at 10:45am

HELP>>PLZ
the vertical component of earth magnetic field at a place is root3 times the horizontal component.What is the value of angle of dip at this place?
Sunday, March 3, 2013 at 1:45am

Physics
1)The Earth exerts an 710 N gravitational force on a man. What force does the man exert on the Earth? Answer in units of N 2)If a book is sitting on a table, the force of gravity pulls it down. Why doesn’t it fall? Is it because The table is pushing up on it with a force ...
Friday, March 1, 2013 at 7:49pm

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?
Friday, March 1, 2013 at 6:43pm

physics
if the angular speed of earth becomes 17times its present value what will be the 1.effect on a body on the equator of earth? it will be A. Heavier than present value B.lighter than present value C.weightless And also what is the reason? 2.a girl sitting on a swing stands up. ...
Friday, March 1, 2013 at 2:19pm

physics
if the angular speed of earth becomes 17times its present value what will be the 1.effect on a body on the equator of earth? it will be A. Heavier than present value B.lighter than present value C.weightless And also what is the reason? 2.a girl sitting on a swing stands up. ...
Friday, March 1, 2013 at 2:18pm

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

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