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September 15, 2014

Homework Help: Science: Earth

Recent Homework Questions About Earth

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Physics
It can be shown that for a uniform sphere the force of gravity at a point inside the sphere depends only on the mass closer to the center than that point. The net force of gravity due to points outside the radius of the point cancels. Part A How far would you have to drill ...
Friday, November 16, 2012 at 2:31pm

5th grade math
Given 257 sec, 15,000 feet per second Find the acceleration due to earth's gravity.
Thursday, November 15, 2012 at 1:20pm

Physics
Neglect the gravity of the Moon, neglect atmospheric friction, and neglect the rotational velocity of the Earth in the following problem. A long time ago, Jules Verne, in his book From Earth to the Moon (1865), suggested sending an expedition to the Moon by means of a ...
Thursday, November 15, 2012 at 11:34am

physics
Use the data of this table to find the point between Earth and the Sun at which an object can be placed so that the net gravitational force exerted by Earth and Sun on this object is zero.
Wednesday, November 14, 2012 at 11:30pm

physics
A satellite has a mass of 106 kg and is located at 1.96 106 m above the surface of Earth. (a) What is the potential energy associated with the satellite at this location? J (b) What is the magnitude of the gravitational force on the satellite? N
Wednesday, November 14, 2012 at 11:30pm

PHYSICS
At what temperature would the rms speed of a nitrogen atom equal the following speeds? (Note: The mass of a nitrogen atom is 2.324 10-26 kg.) (a) the escape speed from Earth, 1.12 104 m/s _____K (b) the escape speed from the Moon, 2.37 103 m/s _____K
Wednesday, November 14, 2012 at 11:13pm

physics
It has been suggested that rotating cylinders about 12 mi long and 4.1 mi in diameter be placed in space and used as colonies. What angular speed must such a cylinder have so that the centripetal acceleration at its surface equals the free-fall acceleration on Earth?
Wednesday, November 14, 2012 at 10:48pm

analyzing poems
Spatial depths of being survive The birth to death recurrences Of feet dancing on earth of sand; Vibrations of the dance survive The sand; the sand, elect, survives The dancer. He can find no source Of magic adequate to bind The sand upon his feet, his feet Upon his dance, his...
Wednesday, November 14, 2012 at 8:15pm

English
1. Plants grow in earth. 2. Plants grow on earth. 3. Plants grow in the earth. 4. Plants grow on the earth. (Which ones are correct? What does #1 mean? Does #i mean that plants grows under the earth?)
Wednesday, November 14, 2012 at 4:01pm

Intro to Physics
At what temperature would the rms speed of a nitrogen atom equal the following speeds? (Note: The mass of a nitrogen atom is 2.324 10-26 kg.) (a) the escape speed from Earth, 1.12 104 m/s ___________K (b) the escape speed from the Moon, 2.37 103 m/s ___________K
Wednesday, November 14, 2012 at 3:41pm

earth
HELP? Two students are given cubic boxes, measuring 10 cm on a side. Robert puts a single glass marble with a diameter of 10 cm in the box. Susan puts 1,000 1-cm glass marbles in her box. 1.Whose box has more empty space? Explain. 2.Whose box will be heavier? Explain. Can you ...
Wednesday, November 14, 2012 at 12:24pm

english
Choose the word needing an apostrophe or an apostrophe and an s. If the sentences is correct, choose no error. 1. Why havent you dotted your j’s? haven’t **** j’s’ no error 2. Ounce for ounce, humans aren’t as strong as most insects. human’s ...
Wednesday, November 14, 2012 at 10:30am

Physics
Please help The year is 2115. There is a high jump competition on planet Mars. An athlete of mass 72 kg who has been clearing a height of 2.44 m on Earth just the week before is competing here. What is the height this athlete can expect to clear in this competition? Relevant ...
Tuesday, November 13, 2012 at 3:14pm

Physics
A 7410-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
Monday, November 12, 2012 at 11:14pm

Physics
In New Hampshire the average horizontal component of Earth's magnetic field in 1912 was 16 uT, and the average inclination or "dip" was 73 degrees. What was the corresponding mag-nitude of Earth's magnetic field?
Monday, November 12, 2012 at 8:43pm

Physics
A ski slope drops at an angle of 24 degrees with respect to the horizontal and is 500 m long. A 60 kg skier skis down from the top to the bottom of the slope. A.) Determine the change in gravitational potential energy of the skier+earth system. b.) If 20% of the gravitation ...
Monday, November 12, 2012 at 8:11pm

geography
Can you check my answers please? 1. What Russian peninsula is located between the Bering Sea and the Sea of Okhotsk? Kamchatka Peninsula 2. How many degrees of longitude circle the Earth? 360 degrees of longitude 3. What continents are included in the "tropics"? ...
Monday, November 12, 2012 at 7:42pm

Physics B
Part 1 Calculate the magnitude of the linear momentum for each of the following cases: A proton with mass 1.67×10 −27 kg moving with a speed of 5.24 × 10 6 m/s. Answer in units of kg · m/s Part 2 A 15.1 g bullet moving with a speed of 327 m/s. Answer ...
Monday, November 12, 2012 at 5:11pm

English- Hamlet
I got to explain this soliloquie in a paragraph: Spoken by Hamlet, Hamlet Act 1 Scene 2: O, that this too too solid flesh would melt Thaw and resolve itself into a dew! Or that the Everlasting had not fix’d His canon ‘gainst self-slaughter! O God! God! How weary, ...
Sunday, November 11, 2012 at 9:33pm

Physics
A rotating cylinder 7.95 kilometers in radius is designed to be used as a space colony. With what period must it rotate so the residents on it feel as heavy as they would on Earth?
Sunday, November 11, 2012 at 7:35pm

Earth Science
Explain the Earth's Cabon Cycle
Sunday, November 11, 2012 at 7:21pm

earth
Explain the Nitrogen Cycle
Sunday, November 11, 2012 at 7:20pm

physics
The Earth’s radius is about 6380 km. The space shuttle is orbiting about 275.0 km above Earth’s surface. If the average speed of the space shuttle is 23500 km/h, find the time required for it to circle Earth.
Sunday, November 11, 2012 at 12:49pm

Physics
A 7410-kg satellite has an elliptical orbit, as in the figure. The point on the orbit that is farthest from the earth is called the apogee and is at the far right side of the drawing. The point on the orbit that is closest to the earth is called the perigee and is at the far ...
Sunday, November 11, 2012 at 6:37am

Physics
The weight of a rock on the moon is 0.85 N. If acceleration due to gravity on the moon is 1.7 m/s2, what will be its weight on the earth
Saturday, November 10, 2012 at 12:53pm

earth
A winding natural stream with weeds has an average depth of 0.86m and is 7.25m across. The stream channel drops 0.34 m/km. What is the stream’s average velocity?
Saturday, November 10, 2012 at 8:37am

Physics
The weight of a rock on the moon is 0.85 N. If acceleration due to gravity on the moon is 1.7 m/s2, what will be its weight on the earth
Friday, November 9, 2012 at 1:55pm

physics
A 14.7 kg crate is pulled up a rough incline with an initial speed of 1.5 m/s. The pulling force is 124.0 N parallel to the incline, which makes an angle of 11.0 ◦ with the horizontal. The coefficient of kinetic friction is 0.31 and the crate is pulled a distance of...
Friday, November 9, 2012 at 1:00am

Physics
The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s Thanks in advance
Thursday, November 8, 2012 at 9:00pm

Physics
A satellite is to be put into a circular low earth orbit at 149 km above surface. What orbital speed (km/s) is required?
Thursday, November 8, 2012 at 8:40pm

physics
Consider a pulse of laser light aimed at the Moon that bounces back to Earth. The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s
Thursday, November 8, 2012 at 8:39pm

physics
Consider a pulse of laser light aimed at the Moon that bounces back to Earth. The distance between Earth and the Moon is 3.84 * 108 m. Show that the round-trip time for the light is 2.56 s.
Thursday, November 8, 2012 at 7:46pm

Physics
The Earth has an angular speed of 7.272·10-5 rad/s in its rotation. Find the new angular speed if an asteroid (m = 3.45·1022 kg) hits the Earth while traveling at a speed of 4.41·103 m/s (assume the asteroid is a point mass compared to the radius of the ...
Thursday, November 8, 2012 at 4:39pm

Physics Projectile Motion
What angle (from earth) should one shoot a projectile so that it reaches it's maximum?
Thursday, November 8, 2012 at 9:58am

Physics
A 3000kg satellite orbits the Earth 400km above the equator. find a)The speed of the satellite b) The kinetic energy of the satellite c) The potential energy of the satellite d) The total energy of the satellite
Thursday, November 8, 2012 at 3:37am

Physics
Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
Thursday, November 8, 2012 at 3:18am

Physics 3A
Determine the magnitude of the effective value of at a latitude of 60 on the Earth. Assume the Earth is a rotating sphere.
Thursday, November 8, 2012 at 2:10am

Physics
Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
Wednesday, November 7, 2012 at 11:00pm

physics
A 2130-kg space station orbits Earth at an altitude of 455 km. Find the magnitude of the force with which the space station attracts Earth. The mass and mean radius of Earth are 5.98 × 1024 kg and 6370 km, respectively
Wednesday, November 7, 2012 at 8:32pm

Math
The radius of Earth is 3,959 miles. A spacecraft orbits 6 miles above the surface of Earth. The spacecraft completes 220° of a revolution around Earth in one day. What is the average speed of the spacecraft?
Wednesday, November 7, 2012 at 7:33pm

physics
A satellite is in a circular orbit about the earth (ME = 5.98 1024 kg). The period of the satellite is 4.20 104 s. What is the speed at which the satellite travels?
Wednesday, November 7, 2012 at 2:46pm

physics
In designing rotating space stations to provide for artificial-gravity environments, one of the constraints that must be considered is motion sickness. Studies have shown that the negative effects of motion sickness begin to appear when the rotational motion is faster than ...
Wednesday, November 7, 2012 at 2:17pm

Physics
Suppose the surface (radius = r) of the space station in the figure is rotating at 38.6 m/s. What must be the value of r for the astronauts to weigh one-half of their earth-weight?
Wednesday, November 7, 2012 at 2:13pm

Physics
If the 50.0 kg boy were in a spacecraft 5R from the center of the earth, what would his weight be? (Use the 50.0 kg boy for significant figures) i got 20N again not sure.. it dosnt tell me if i got them wrong or right online classes are horrible and very confusing
Wednesday, November 7, 2012 at 11:51am

Physics
two satellites are launched from earth to the same altitude. One is twice the mass of the other. How will their periods compare?
Tuesday, November 6, 2012 at 8:14pm

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ...
Tuesday, November 6, 2012 at 10:30am

Physics
The earth rotates once per day about an axis passing through the north and south poles, an axis that is perpendicular to the plane of the equator. Assuming the earth is a sphere with a radius of 6.38 106 m, determine the speed and centripetal acceleration of a person situated ...
Tuesday, November 6, 2012 at 10:30am

earth science9volcanos0
when a volcano becomes dormant it is...
Monday, November 5, 2012 at 8:20pm

physics
Estimate the energy required from fuel to launch a 1465 kg satellite into orbit 1375 km above the Earth’s surface. Consider two cases: (a) the satellite is launched into an equatorial orbit from a point on the Earth’s equator, and (b) it is launched from the North ...
Monday, November 5, 2012 at 8:06pm

physics
A student on Earth has a mass of 55.5 kg. With how much force does the Earth pull on the student?
Monday, November 5, 2012 at 5:19pm

Chemistry - Please help!
Small quantites of hydrogen peroxide can be prepared by the action of an acid on an alkaline earth metal peroxide, such as barium peroxide. BaO2 (s) + 2HCl (aq) -> H2O2 (aq) + BaCl2 (aq) What mass of hydrogen peroxide should result when 15.0g of barium peroxide is treated ...
Monday, November 5, 2012 at 2:41pm

physics
The average distance separating Earth and the Moon is 384,000 km. A 2.6x104 kg spaceship located halfway between them. (b) What is the total potential energy of the ship?
Sunday, November 4, 2012 at 6:21pm

earth
If you had a mole of M&M's, how many times could you cover the surface of the earth ?
Sunday, November 4, 2012 at 4:39pm

Physics Help, Please
In the final stages of the landing process, a spaceship decelerates at a constant rate of 5.3 m/s2 heading towards the Earth. A 3kg lamp is hanging straight down, attached to the ceiling of the ship cabin by a chain. What is the tension in the chain?
Sunday, November 4, 2012 at 1:49pm

College Physics
In 1986, the distance of closest approach of Halley’s comet to the Sun is 0.57AU. (1 AU is the mean Earth-Sun distance = 150 million kilometers.) The comet’s speed at closest approach is 54.97 km/s. (a) – By 1989, Halley’s comet had traveled to a distance ...
Sunday, November 4, 2012 at 12:27pm

Pre- AP Physics
The earth exerts a force of 1400 N on an orbiting communications satellite that is 35 mi above the Earth. What is the magnitude of the force the satellite will exert on the earth? Answer in units of Newtons
Sunday, November 4, 2012 at 10:07am

science
How long would it take a radio wave with a frequency of 5.1 × 105 Hz to travel from Mars to Earth if the distance between the two planets is approximately 8.00 × 107 km?
Sunday, November 4, 2012 at 9:29am

Physics
weightlessness experienced while orbiting the earth is due to ?
Saturday, November 3, 2012 at 9:08pm

Physics
A ferry is crossing a river.The ferry is headed due north with a speed of 2.5 m/s relative to the water and the river's velocity is 2.0 m/s to the east. What is the magnitude and direction of the ferry's velocity relative to Earth. ( Give the angle from east 0 degrees )
Saturday, November 3, 2012 at 2:10am

physics please help
In a physics laboratory experiment, a coil with 170 turns enclosing an area of 10cm^2 is rotated from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The rotation takes 5.0×10^2 s . The earth...
Friday, November 2, 2012 at 8:17pm

mechanics
The figure below shows a ball with mass m = 0.299 kg attached to the end of a thin rod with length L = 0.388 m and negligible mass. The other end of the rod is pivoted so that the ball can move in a vertical circle. The rod is held horizontally as shown and then given enough ...
Friday, November 2, 2012 at 5:18am

Chemisty
Enrico Fermi was a famous physicist who liked to pose what are now known as Fermi problems in which several assumptions are made in order to make a seemingly impossible estimate. One example of a Fermi problem is "Caesar's last breath" which estimates that you, ...
Thursday, November 1, 2012 at 9:05pm

science
although each place on earth has its own climate,they can be grouped based on certain overall characteristics.what are the keys factors that scientist use to determine the climate of a particular place
Thursday, November 1, 2012 at 5:31pm

Physics
Given that the Sun has a mass 333,000 times larger than Earth’s mass and Earth has an average distance of 1.49 x 1011 m from the Sun, at what distance from the Sun is the center of mass of the Earth-Sun system? a. 1.00 m b. 4.47 x 105 m c. zero d. 333,000 m e. 1.49 x ...
Wednesday, October 31, 2012 at 9:06pm

physics
for an 84 kg person standing at the equator what is the magnitude of angular momentum about the earths center due to earth's rotation
Wednesday, October 31, 2012 at 5:06pm

physics
If Joe weighs 100N on the moon how much will Joe weigh on earth? N & kg
Wednesday, October 31, 2012 at 12:42pm

english
Animals Possess sensory powers that humans lack. Homing pigeons fly with great speed and accuracy when 1)___(e)d with messages to faraway places. How do Pigeons 2)___ themselves in unfamiliar regions? This remains something of a(n) 3)___. The mystery, however, is partly ...
Tuesday, October 30, 2012 at 9:51pm

History/English
This assignment is in my English class but its about MLK so I thought I'd put History and English. So this is REALLY long! I typed it all myself and all I need is someone to check my facts and to edit. I know it's long, so if you only want to read a paragraph that'...
Monday, October 29, 2012 at 10:43pm

Physics
1. If a bar magnet is broken into two pieces, how many magnetic poles are there? 2. A long straight wire carries a current in the direction shown in the following figure. At the point labeled A, is the direction of the magnetic field left, right, up. Down, into the page, or ...
Monday, October 29, 2012 at 7:03pm

science
the distance from the earth to the moon is 240000 miles. if the speed of light is 2.998 x 10^8 meters per second, how long does it take for light reflected from the moon to reach our planet?
Monday, October 29, 2012 at 4:54pm

Physics help
A car travels in a circle whose radius is 31 m, with a speed of 19 m/s. (1) What is the magnitude of the car's acceleration? _____ m/s2 (2) What is the nature (origin) of the horizontal force on the car? (What is exerting the force?) The force causing the car to turn is: ...
Sunday, October 28, 2012 at 10:57pm

Physics
The acceleration due to gravity calculated this way works well for objects near the Earth’s surface. How would you have to change the above equation if the object was 100,000 meters above the ground?
Sunday, October 28, 2012 at 1:12pm

Science
Fill in the blanks: 1. Minerals are classified in many ways, including hardness, streak, and _______ properties. 2. There are some minerals that are valued as _______ because of their hardness, color, and beauty. 3. Non-silicates make up less than 10% of Earth's _______; ...
Saturday, October 27, 2012 at 5:35pm

Physics
What would the weight of an object that is 4N on the earth be on the moon (acceleration due to gravity on the moon is 1.62m/s2?
Thursday, October 25, 2012 at 9:23pm

Physics
If the moon were twice as massive, would the attractive force of Earth on the moon be twice as large? Yes No What about the attractive force of the moon on Earth? Yes No
Thursday, October 25, 2012 at 5:13pm

Physics
In what way does gravity change with distance from Earth?
Thursday, October 25, 2012 at 5:12pm

Physics
Calculate the force of gravity between a newborn baby of mass 4 kg and the obstetrician of mass 75 kg, who is 0.5 m from the baby. N Which exerts more gravitational force on the baby, Mars or the obstetrician, given that Mars has a mass of 6.4 1023 kg and is 8. 1010 m from ...
Thursday, October 25, 2012 at 5:12pm

Physics
A pendulum consists of a 2.6 kg stone swinging on a 4.5 m string of negligible mass. The stone has a speed of 7.9 m/s when it passes its lowest point. (a) What is the speed when the string is at 53 ¢ª to the vertical? (b) What is the greatest angle with the vertical ...
Thursday, October 25, 2012 at 3:15pm

Math
Let d(t) be the shortest distance between Earth and the nearest other planet as a function of time t (where t is in years and t = 0 is noon on January 1, 1000 A.D., say). Is d continuous? Why or why not?
Wednesday, October 24, 2012 at 11:27pm

Science
Fill in the blanks 1. Minerals are classified in many ways, including hardness, streak, and ______ properties. 2. There are some minerals that are valued as _______ because of their hardness, color, and beauty. 3. Non-silicates make up less than 10% of Earth's _______; the...
Wednesday, October 24, 2012 at 10:41pm

scientist
how could measuring the orbit of a comet help scientists understand when it will next be visible on Earth?
Wednesday, October 24, 2012 at 7:11pm

physics
Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when...
Wednesday, October 24, 2012 at 1:34am

physics
Consider a spacecraft that is to be launched from the Earth to the Moon. Calculate the minimum velocity needed for the spacecraft to just make it to the Moon’s surface. Ignore air drag from the Earth’s atmosphere. Hint: The spacecraft will not have zero velocity when...
Wednesday, October 24, 2012 at 1:17am

Math
ilorin is at 8.5 degree to the north,4.6 degree to the east and free town at 8.5degree to the north,13.3degree to the west calculate(a)their distance apart,measured along the parallel of latitude(b)their distance from the equqtor(c)their speed in km/h due to the rotation of ...
Wednesday, October 24, 2012 at 1:12am

Math
the speed of a point A due to the rotation of the earth is twice that point of B.if A is on latitud 22 degree to the north calculate the latitude of B
Wednesday, October 24, 2012 at 12:59am

Physics
How do I find the instantaneous acceleration of the earth orbiting the sun? Everything I am trying is incorrect. I am using 1 second as my time and get 1.99E-7 rads/second. First I tried: acceleration = theta x t / radius Where: theta = 1.99E-7 rads radius = 6.371E6 Then I ...
Tuesday, October 23, 2012 at 11:35pm

physics
You are explaining to a friend why the crew of the International Space Station feels weightless while orbiting the Earth. Your friend responds that he thought gravity was just a lot weaker up there. Show that it isn’t so by calculating the acceleration due to gravity 350 ...
Tuesday, October 23, 2012 at 10:45pm

Physics
An Earth satellite moves in a circular orbit at a speed of 5800 m/s. a)What is the radius of the satellite's orbit? b) What is the period of the satellites orbit in hours?
Tuesday, October 23, 2012 at 6:15pm

Physics
Astronomers can calculate the mass of a planet by using the orbital parameters of one of its moons. Consider a hypothetical planet, which has a hypothetical moon that orbits the planet in a roughly circular orbit with a radius of 3.95*10^8 m. The moon takes 12 Earth days to ...
Tuesday, October 23, 2012 at 6:14pm

Physics
The asteroid belt circles the sun between the orbits of Mars and Jupiter. One asteroid has a period of 10 Earth years. a) What is the asteroid's orbital radius? b)What is the asteroid's orbital speed?
Tuesday, October 23, 2012 at 6:12pm

Math
Earth has a new surface of 1.97x10^8 square miles. A new planet has a surface area 13 times the surface area of Earth. What is the surface area of the new planet? Do I multiply 1.97x13 or do I multiply 13x10^8? that's what i'm confused about.
Tuesday, October 23, 2012 at 5:56pm

science
These are the 3 questions that will help me study for my test. i need help understanding each of these thankyou :) Distinguish between microevolution and macroevolution. Explain how forest organisms (producers and consumers) separated by a highway could evolve into different ...
Monday, October 22, 2012 at 9:28pm

Physics help PLZ!!
Estimate the energy required from fuel to launch a 1465 kg satellite into orbit 1375 km above the Earth’s surface. Consider two cases: (a) the satellite is launched into an equatorial orbit from a point on the Earth’s equator, and (b) it is launched from the North ...
Monday, October 22, 2012 at 5:50pm

Physics
Compute the angular momentum of the earth arising from the following motions. (a) Earth's orbital motion around the sun. (b) Earth's rotation on its axis.
Monday, October 22, 2012 at 4:03pm

geography
1. What is the name of the third largest ocean in the world? The Indian Ocean 2. What is the capital of the People's Democratic Republic of Yemen? Aden 3. What is the equator? The imaginary line that stretches around the Earth separating the Northern and Southern ...
Sunday, October 21, 2012 at 10:41pm

Physics
A military helicopter on a training mission is flying horizontally at a speed of 60.0 m/s and accidentally drops a bomb (fortunately not armed) at an elevation of 350 m. You can ignore air resistance. Find the horizontal and vertical components of its velocity just before it ...
Sunday, October 21, 2012 at 9:20pm

Geometry
Imagine that all the people on Earth could stand side by side together. How much area would be needed? Would all the people on earth fit in Rhode Island? Explain your reasoning. Rhode Island, the smallest state in terms of area, has a land area of 1000 square miles. Assume ...
Sunday, October 21, 2012 at 6:48pm

Math
Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle
Sunday, October 21, 2012 at 5:22pm

Math
Radius of earth 3,959 miles Space shuttle orbits 200 miles above earths Surface Space shuttle completes 220 degrees of a Revolution around earth in one day What is the average speed of the space Shuttle
Sunday, October 21, 2012 at 4:52pm

Physics
The gravitational field strenght on the moon is 1.63N/kg. If a rock on the moon weights 2000N, how much does the same rock weigh on the earth?
Sunday, October 21, 2012 at 1:19pm

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