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October 21, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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science
If a scale model of the planets are built with Earth's diameter set to 10 centimeters, how big would the model of Jupiter have to be in centimeters?
Monday, April 1, 2013 at 5:18pm

Physics
A 45-m length of wire is stretched horizontally between two vertical posts. The wire carries a current of 67 A and experiences a magnetic force of 0.15 N. Find the magnitude of the earth's magnetic field at the location of the wire, assuming the field makes an angle of 51....
Monday, April 1, 2013 at 2:44pm

Math
The gravitational acceleration, g, on the Earth is proportional to the mass, M, of the Earth and inversely proportional to the square of the distance, r, from the Earth's center. If the gravitational acceleration on the center of the Earth is 9.8 m/s^2, what is the ...
Monday, April 1, 2013 at 1:51pm

Science Physics
An object weighs 12 N on earth. When it is brought to Mars, it has a weight of 4.8 N. What is the acceleration due to gravity on Mars? (Taking the acceleration due to gravity on earth is 10 m/s²)
Monday, April 1, 2013 at 10:17am

geology
If the tilt of the earth’s axis increased to 30 degrees, which of the following statements would be correct? (a) There would likely be a greater variation between summer and winter positions of the Sub Tropical Ridge. (b) Summers are likely to become cooler and winters ...
Monday, April 1, 2013 at 5:54am

Math
the mass of earth is 5.97 x 10^24 kilograms. The mass of the moon is 7.34 x 10^22 kilograms. Part A: What is the combined mass of earth and the moon? express your answer in scientific notation. Part B: How many times greater is the mass of earth than the mass of the moon? ...
Sunday, March 31, 2013 at 3:12pm

math
The ocean covers about 71% of the Earth’s surface. If the total surface area of the Earth is about 510 million square kilometers, how many square kilometers are covered by the ocean?
Thursday, March 28, 2013 at 10:33pm

pre calculus
Write the equation of the circle in standard form. Find the center, radius, intercepts, and graph the circle. x^2+y^2-12x-4x+36=0 How on earth do I do this?
Thursday, March 28, 2013 at 8:58pm

Physics
Satellites A and B are in circular orbits, with A two and a half times as far from earth's center as B. How do their orbital periods compare?
Wednesday, March 27, 2013 at 12:48pm

sience
How would life be different without resources taken for under earth's surface?
Tuesday, March 26, 2013 at 8:07pm

Physics
The power radiated by the sun is 3.90 1026 W. The earth orbits the sun in a nearly circular orbit of radius 1.50 1011 m. The earth's axis of rotation is tilted by 27° relative to the plane of the orbit (see the drawing), so sunlight does not strike the equator ...
Tuesday, March 26, 2013 at 4:32pm

Science
About 10 percent of the earth’s surface are covered with glaciers today. Where are most of these glaciers found
Tuesday, March 26, 2013 at 4:01pm

Science
What is Earth's surface (sea level)? Its pressure is 14.7 psi. That is what is the number of ft.
Monday, March 25, 2013 at 2:02pm

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

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

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

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
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
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
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
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

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
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
. 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
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
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

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
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
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

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

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

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

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
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

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