Thursday
August 28, 2014

Search: An satellite moves in a circular orbit 775 km above the Earth's surface. The period of the motion is 100.1 min.

Number of results: 44,664

Physics
A 0.075 kg ball in a kinetic sculpture moves at a constant speed along a motorized conveyor belt. The ball rises 1.32 m above the ground. A constant frictional force of 0.350 N acts in the direction opposite the conveyor belt's motion. What is the net work done on the ball?
December 9, 2010 by Brian

physics
explain the law of motion needed to slove this problem. On Planet Zorg, a 30kg barbell can be lifted by only exerting a force of 180N. what is the acceleration of gravity on Planet Zorg? Predict how the motion of this object would change on earth.
May 18, 2013 by Kye

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
February 23, 2013 by Abbey

physics
A 215 g mass is attached to a spring and executes simple harmonic motion with a period of 0.250 s. If the total energy of the system is 2.30 J. (a) Find the force constant of the spring. 135.81 N/m (b) Find the amplitude of the motion. i just need help with what equation i ...
January 12, 2011 by julie

Science
Both comets and planets orbit the sun. How do their orbits differ? Comets orbit elliptically, and planets orbit more circularly. Please correct me if Im wrong, thanks
February 15, 2010 by Sara

Science-Help
Both comets and planets orbit the sun. How do their orbits differ? Comets orbit elliptically, and planets orbit more circularly. Please correct me if Im wrong, thanks
February 15, 2010 by Sara

Physics
If the mass of a planet is 0.571 times that of the Earth and its radius is 0.787 times that of the Earth, estimate the gravitational field g at the surface of the planet. The gravitational acceleration on Earth is 9.8 m/s2. Answer in units of m/s2
October 29, 2013 by Kate

physics
A 751 N diver drops from a board 9.10 m above the water’s surface. The acceleration of gravity is 9.81 m/s2 . a) Find the diver’s speed 3.00 m above the water’s surface. Answer in units of m/s.
February 11, 2011 by Anonymous

physics
A small cylinder rests on a circular turntable that is rotating clockwise at a constant speed. The cylinder is at a distance of r = 12 cm from the center of the turntable. The coefficient of static friction between the bottom of the cylinder and the surface of the turntable is...
July 10, 2013 by tom

PHYSICS 1 ..lab helllpppppppp
1.described the motion of mud that flies off from a rapidly spinning wheel. 2.explain why the outer rail is higher than the inner rail of curve in a railroad track. 3. a 5kg mass is moving in a circle of a radius 3m at a speed of 30 m/sec.determine the required centripetal ...
January 28, 2013 by JORHO

Physics-mechanics
A 1.0 kg mass weighs 9.8 N on Earth's surface, and the radius of the Earth is roughly 6.4 x 10^6 m. Calculate the average density of Earth. (Show how you would calculate for density; don't just give the answer because L wan't to understand how you arrived at your answer).
December 27, 2012 by Rebecca

maths
would it be number 6? The head of an industrial machine moves in a straight line horizontally backwards and forwards from a central position. The movement can be modelled using the sine wave d = 80 sin ( pie t), where d is the horizontal distance (in cm) from the central ...
May 11, 2007 by katie

physics
The auroral zone is defined by the last field line from the Earth that returns to the Earth. If the field of the earth extends no further than 10RE in the sunward direction, at what angle (in degrees) in the picture above does the last field line that returns to the earth on ...
April 10, 2013 by Ruben

physics
If the earth acceleration due to gravity on a mass of 2000kg on the earth surface is 10ms.What will be the acceleration due to gravity when it is at a point twice the radius of the earth.What is the gravitational force on it.
August 12, 2011 by Boniface

physical science
Diamonds are made 1. at the surface of earth 2. magma moving at supersonic speeds deep inside the earth 3. in river beads 4. in limestone caverns
September 17, 2009 by Clarissa

science
suggest only one best method to avoid such a collision if a near earth asteroid of radius 50m strikes the earth surface?
December 21, 2009 by sam

Mechanics:Statics
A man weighs 900N on the surface of the earth. Compare his weight in an airplane flying at an elevation of 9000m. Note that the radius of Earth is 6378km.
April 19, 2013 by Marc

science
The radius of the Earth is approximately 3,960 miles. Find the approximate surface-area-to-volume ratio of the Earth. A. 0.00025 B. 0.00076 C. 1,320 D. 11,880
July 10, 2013 by emma

Earth Science
Why is it generally warmer in a rural area than in an urban area? I have a question: How does the earth's surface heat up or cool down? My answer: the sun heats up the earth darker surfaces are warmer than cooler surfaces. Please help.
December 19, 2007 by Lori

earth
The acceleration due to gravity on planet X is one fifth that on the surface of the earth. If it takes 4.6 s for an object to fall a certain distance from rest on earth, how long would it take to fall the same distance on planet X? Answer in units of s
September 26, 2011 by Anonymous

physics-forces
Kara (55kg) is standing next to her brother Ben (80kg) on a large piece on frictionless ice. Kara decided to push her brother with a force of 200N expecting him to slide across the ice while she remains standing in the middle of the ice rink laughing. a) Describe the motion ...
January 20, 2014 by Diane

Physics
(a)Assuming that only gravity is acting on it, how far does an electron have to be from a proton so that its acceleration is the same as that of a freely falling object at the Earth’s surface? (b)Suppose the Earth were made up only of protons but had the same size and mass it ...
July 29, 2010 by Brian

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 ...
March 1, 2013 by Anonymous

sCiEnCe
Can you define speed, motion, constant speed and average speed? And can you get me there formulas? Ex-Distance over speed THANKS MUCH! <333 Can you define speed, motion, constant speed and average speed? And can you get me there formulas? Ex-Distance over speed THANKS MUCH...
March 4, 2007 by Jonas!

Physics HELP!!
A steel ball is hung from a vertical ideal spring where it oscillates in simple harmonic motion with a period T . At time t = 0 s, the ball is at its maximum displacement, A , from its equilibrium position. In terms of the period, at what time will the ball be at y = 0.75 A ? ...
November 30, 2011 by Kinga

physics
A force of magnitude 25Nis directed at an angle of 37 deg above the horizontal moves a 10 Kg block along a horizontal surface at a constant velocity .How much work is done by this force in moaing the block a distance of 15m?
July 16, 2010 by john

physics
7.0 kg block moves in a straight line on a horizontal frictionless surface under the influence of a force that varies with position as shown below. How much work is done by the force as the block moves from the origin to x = 8.0 m?
November 2, 2012 by kunal

Physics (Oscillation)
If a particle moves in simple harmonic motion with a frequency of 3.00 Hz and an amplitude of 5.00 cm through what total distance does the particle move during one cycle of its motion, what is its maximum speed, where does this maximum speed occur and what and where does the ...
September 8, 2010 by James

physics
It is falling. It has to fall, that is the law of gravity. Otherwise, it would leave Earth in a straight line. But if it falls at exactly the rate it needs to fall to travel in an orbit, we call that "orbiting". If if falls faster than that, it crashes into Earth. If if falls ...
August 17, 2010 by Anonymous

physics
I need help finding an equation for: an asteroid revolves around the sun with a mean orbital radius twice that of Earth's. Predict the period of the asteroid in Earth years. Thank you.
December 9, 2010 by annie

physics
a satellite can be launched into orbit through use of a specialized cannon that measured 18.0 meters in length. what would the average acceleration through this cannon have to be in order to have a muzzle velocity of 29000 km/h ?
January 30, 2011 by jafara

Earth Science
According to Kepler's law of harmonies, which planet takes the longest to orbit the Sun?
December 10, 2009 by Chris

Motion
Can sumone explain wot linear motion is? Wot's the opposite of linear motion? THX Linear motion is motion is a constant direction, i.e., along a straight line. The speed may change but the direction may not. Motion that is not linear is called curvilinear.
June 25, 2005 by Mike

physics
what is the angular speed of one satellite as seen by an astronaut in another satellite?
February 21, 2012 by vivek

earth science
Earthquakes and valcanoes change Earths surface quickly. Can you name at least two processes that canchange earhts surface slowly?
September 20, 2010 by Mia

physics
1. If our sun shrank in size to become a black hole, using the gravitational force equation, explain why the Earth's orbit would not be affected. 2. Strictly speaking, you weigh a tiny bit less when you are in the lobby of a massive skyscraper than you do at home. Why is this ...
July 13, 2010 by confused

physics
Halley's comet moves about the sun in an elliptical orbit with its closest approach to the SUn being .59AU and its greatest distance being 35AU (1AU=Earth-sun distance) if the comet's speed at closest approach is 54km/s what is its speed when it is farthest from the Sun? you ...
January 29, 2007 by cyndi

maths
The total population of the earth was estimated to be 6.42 billion people.Given that the total land surface area of the earth is about 1.5×10^8km^2.Find the average number of people living in 1 km^2 of land on earth,correct to 2 significant figures.Thanks a lot for helping me!!^^
January 11, 2014 by ashley

Physics
A car weighing 9800 N moves around a circular track of 70 m in 60 s. (a)
November 18, 2006 by Vv

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?
February 25, 2013 by Anonymous 007

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?
February 26, 2013 by Anonymous 100

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?
February 27, 2013 by please urgently needed!!!

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?
February 27, 2013 by John

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?
March 1, 2013 by John

Physics Gravity
A projected space station consists of a circular tube that will rotate about its center (like a tubular bicycle tire) as shown in the figure . The circle formed by the tube has a diameter of about 1.1-km What must be the rotation speed (revolutions per day) if an effect equal ...
June 16, 2012 by Mike Joseph

Physics -I'm stumped
Europa, a satellite of Jupiter, appears to have an ocean beneath its icy surface. Proposals have been made to send a robotic submarine to Europa to see if there might be life there. There is no atmosphere on Europa, and we shall assume that the surface ice is thin enough that ...
November 30, 2007 by Christina

physics
A long, straight wire lies on a horizontal table and carries a current of 3.05 µA. In a vacuum, a proton moves parallel to the wire (opposite the current) with a constant speed of 3.00 104 m/s at a distance d above the wire. Ignoring the magnetic field due to the Earth, ...
December 4, 2012 by Anonymous

physics =)
A 0.200 kg plastic ball moves with a velocity of 0.30 m/s. It collides with a second plastic ball of mass 0.100 kg, which is moving along the same line at a speed of 0.10 m/s. After the collision, both balls continue moving in the same, original direction. The speed of the 0....
December 25, 2009 by Heart

Physics: Simple Harmonic Motion
A 10kg particle undergoes simple harmonic motion with an amplitude of 2.0mm, a maximum acceleration of 8.0x10^3 m/s^2, and an unknown phase constant (phi) What are: a.) the period of the motion b.) the maximum speed of the particle c.) total mechanical energy of the oscillator...
December 1, 2010 by Greg

physics
above the earth, a 500nT magnetic field captures particles coming from the sun. If a proton moving at 600km/s runs into this magnetic field, what is the radius of motion of the proton? and also how long does it take the proton to travel in one circle?
March 12, 2009 by jeff

space
Stars near the ______ should show the greatest Doppler shifts due to the earth's revolution. Why? Would it be stars near the ecliptic because it deals with the earth revolving and having motion.
October 25, 2010 by Anonymous

phyiscs help please
A 3.00*10^2 N force is pulling an 80.0 kg refrigerator across a horizontal surface. The force acts at an angle of 18.0° above the surface. The coefficient of kinetic friction is 0.200, and the refrigerator moves a distance of 8.00 m. (a) Find the work done by the pulling force...
October 29, 2010 by Anonymous

physics
a satellite completes one revolution of a planet in almost exactly one hour. at the end of an hour , the satellite has traveled 2.0x10^7 meters and is only 10 meters away from its starting point. What is the numerical value of the satellite's average velocity after that one hour?
May 19, 2012 by Anonymous

physics
A diver runs and dives off the end of a spring board that is 0.9 meters above the surface of the water. As she takes off from the diving board, her velocity is 5.2 m/s directed 36° above horizontal calculate: a) the time she is in the air s b) the distance she lands from the ...
October 29, 2012 by Mat

Science
If you were to look down on Earth from above the North Pole, in which direction would Earth appear to rotate? If you were to look down on Earth from above the North Pole, then earth would appear to rotate in a counter-clockwise direction. More info would be appreciated, thanks.
February 5, 2010 by Sara

Calc
A buoy oscillates in simple harmonic motion as waves go by. The buoy moves a total of 3.5 feet from its low point to its high point and it returns to its high point every 10 seconds. What is the equation that describes this motion if it reaches its high point is at t=0?
July 30, 2008 by Emily

science
The thin, outer layer of the earth's surface is its_____. a) skin b)crust c) core d) soil e) surface Just need to know if my answer or right or wrong. Thanks! :) b
August 20, 2010 by ant

Earth space science, check answers?
A. 75 % B. 12.5% C. 25% D. 3.13% E. 9.38% 3. what percentage of land on the earths surface is inhospital lands? - B 4. what percentage of earths surface is covered by land? - C 5. what percentage of land on earth is usable, for living on, but not for agriculture/farming?-D 6. ...
November 15, 2013 by Selena

trig
A space shuttle 200 miles above the earth is orbiting the. Earth once every 6 hours. how far does the shuttle travel in one hour? Note the radius of earth about 4000 miles.
September 17, 2011 by Ali

classical mechanics
Attach a solid cylinder of mass and radius to a horizontal massless spring with spring constant so that it can roll without slipping along a horizontal surface. If the system is released from rest at a position in which the spring is stretched by an amount what is the period ...
December 10, 2013 by socorro

Physics
A projectile is launched at an angle of 34.0o above the horizontal. The projectile has a mass of 1.50 kg and is given an initial speed of 20.0 m/s. a) What is the initial kinetic energy of the projectile? b) By how much does the gravitational potential energy of the projectile...
May 30, 2014 by John

physics
A rocket is launched at an angle of 56.0° above the horizontal with an initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 29.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. What...
November 16, 2010 by kayla

physics
A rocket is launched at an angle of 56.0° above the horizontal with an initial speed of 101 m/s. The rocket moves for 3.00 s along its initial line of motion with an acceleration of 29.0 m/s2. At this time, its engines fail and the rocket proceeds to move as a projectile. What...
November 16, 2010 by kayla

Physical Science
The heat of volcanoes and hot springs comes from trace amounts of radioactive minerals found in the Earth's interior. Why isn't the same rock at the Earth's surface warm?
March 10, 2008 by Rachel

earth science
Which one of the following objects will have the greatest force of gravity to the Earth at its surface . A large book B. A house C. A human being D. An average-size car i don't get it??
June 13, 2009 by me

PHYSICS
How long would a meteor, with a velocity of 45 km/s, take to travel 120 km through Earth's atmosphere to Earth's surface? Assume no atmospheric friction. A. 0.375 s B. 2.66 s C. 45 s D. 5400 s I say B.
July 21, 2010 by Anonymous

Math, Geomertry
A total solar eclipse occurs when the moon passes between the earth and the sun, and the darkest shadow cast by the moon, called the umbra, hits the surface of the earth. If the umbra does not hit the surface, as shown in the following figure, then a total solar eclipse is not...
April 4, 2014 by Luis

Astronomy
Choose one answer for each question How old is the universe? 6,000 years old 380,000 years old 13.8 billion years old 13.8 million years old A parsec is: Longer than a light year The distance between the Earth and the Sun Approximately 3x10^24 cm None of the above The distance...
April 29, 2014 by qwerty

Physics
A proton orbits a negatively charged wire that has a linear charge density of 8.0 x 10 -9 C/m. What speed must the proton have to maintain a circular orbit at 1.3 cm?
February 10, 2011 by Please Help!!!!!!!!!!!

chem
1. The total power used by humans worldwide is approximately 15 TW (terawatts). Sunlight striking the Earth provides 1.336 kW per square meter (assuming no clouds). The surface area of Earth is approximately 197,000,000 square miles. How much of Earth’s surface would we need ...
May 14, 2013 by tra

physics
Near the surface of the Earth, a startled armadillo leaps vertically upward at time t = 0, at time t = 0.5 s, it is a height of 0.98 m above the ground. At what time does it land back on the ground?
April 20, 2010 by Jason

Physics!
Imagine a giant dry-cleaner's bag full of air at a temperature of -31 floating like a balloon with a string hanging from it 15 above the ground. Estimate what its temperature would be if you were able to yank it suddenly back to Earth's surface.
May 2, 2013 by Erica

SCIENCE
IF AN OBJECT IN A CIRCULAR MOTION BEGINS TO MOVE FASTER, WHAT HAPPENS TO THE CENTRIPETAL FORCE?
March 6, 2008 by MELISSA

Physics
When dealing with circular motion; a string with the length of .4m is being spun horizontally, is the radius .2m?
November 8, 2012 by Troubled

Math - Geometry
A cylindrical solid has a cylindrical circular hold drilled out of the center. Bascially, it's a circular cylinder with a hollow spot right down the middle. Find the surface area of the resulting solid. radius of larger circle: 2in radius of smaller circle (hollow area): 1in ...
May 21, 2008 by Nikki

math
A mason's assistant's rate of pay is $0.75 per cubic foot of earth moved. He moves 220 cubic feet of earth to dig a trench. What is his pay for this job? THE ANSWER IS NOT &330
June 17, 2013 by Stacey

Physics
A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
October 12, 2013 by Mehrin Ali

Physics
A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
October 12, 2013 by Mehrin Ali

Physics
A projectile is fired from the surface of the Earth with a speed of 200 meters per second at an angle of 30° above the horizontal. If the ground is level, what is the maximum height reached by the projectile? (A) 5 m (B) 10 m (C) 500 m (D) 1,000 m (E) 2,000 m
October 12, 2013 by Mehrin Ali

Physics
The rockets on a cell phone satellite provide a thrust of 12,000N. If the mass of the satellite is 15,000kg, What will be the resulting acceleration?
March 10, 2014 by Sandra

physics
As the earth rotates through one revolution, a person standing on the equator traces out a circular path whose radius is equal to the radius of the earth (6.38 106 m). What is the average speed of this person in meters per second?
August 19, 2009 by Anonymous

physics
The period of a satellite is independent of a) Its own mass b) The mass of the planet it orbits c) The value of the gravitational constant The orbital d) radius
May 15, 2012 by khevna

physics
Hint: for part I use G = 6.67 times 10 to the negative 11. for part II, you don’t need to do the full calculation, you can just use your knowledge of how force of gravity depends on mass and separation distance. Compare the gravitational force on a 49 kg mass at the surface of...
December 15, 2009 by chitra

Earth Science
A contour (topographic) map indicates that a stream is flowing across a landscape. If the stream has a constant volume, where on the map would the stream most likely have the highest velocity? a. As the stream moves across several closely spaced contour lines b. as the stream ...
September 29, 2013 by Paula

Physics!
An electron orbits a 3.0 cm diameter metal ball 5.0 mm above the surface. The orbital period of the electron is l2.0 micro seconds. What is the charge on the metal ball? I think I use E=kq/r*R but im unsure! Please help! Thanks
February 7, 2012 by Collin

physics
A person bounces up and down on a trampoline, while always staying in contact with it. The motion is simple harmonic motion, and it takes 2.82 s to complete one cycle. The height of each bounce above the equilibrium position is 40.8 cm. Determine (a) the amplitude and (b) the ...
February 2, 2009 by Sarah

science
A satellite completes one revolution of a planet in almost exactly one hour. At the end of one hour, the satellite has traveled 2.0 × 107 meters and is only 10 meters away from its starting point. What is the numerical value of the satellite's average velocity after that one ...
April 11, 2013 by heidi

Physics
Which of the following involves a non-zero net force? I. A hockey-puck sliding at a constant speed on ice. II. The earth revolving around the sun at a constant speed. III. An object falling near the surface of the earth. A) I only B) III only C) Both I and II D) Both II and ...
October 13, 2011 by Astrogirl

science
in a hydrogen atom an electron of mass 9.1*10^-31 kg revolves about a proton in a circular orbit of radius 53 ampere .calculate the centripetal acceleration electron on charge 1.6*10^-19
May 28, 2013 by Anonymous

physical
What is the reaction force to an action force of 750 N exerted by Earth on an orbiting communications satellite?
October 27, 2011 by Anonymous

Science
If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look? a. in the section for the Ordovician period of the Paleozoic era. b. in the section for the Quaternary period of the Cenozoic era. c. in the section for the Triassic ...
October 31, 2013 by Anonymous

Science
If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look? a. in the section for the Ordovician period of the Paleozoic era. b. in the section for the Quaternary period of the Cenozoic era. c. in the section for the Triassic ...
November 1, 2013 by Anonymous

Science
If you wanted to consult the geologic period for when the first vertebrates evolved, where would you look? a. in the section for the Ordovician period of the Paleozoic era. b. in the section for the Quaternary period of the Cenozoic era. c. in the section for the Triassic ...
November 1, 2013 by Anonymous

12th
an electron above the earth is balanced by the gravitational force and the electric field of the earth. find the electric field of the earth.
April 27, 2013 by priya

Physics
Two current carrying wires cross at right angles as indicated in the figure. If the wires are not restrained, what statement best describes the motion of the wires? Hint: To help you visualize the situation, draw first the magnetic field that Wire 1 makes at the points shown ...
March 15, 2010 by mm.

chemistry
A sample contains Hydrogen atom ,He+ ion, Li2+, & Be3+ ion. In H atom electron is present in 8th orbit, in He2+ e- is present in 6th orbit, Li2+ in 5th orbit& in Be3+ electron is present in 4th orbit. All the atoms are de-excited to the ground state. Calculate the total no. of...
June 4, 2014 by Swapnil

Chemistry
2 NO(g) + O2 (g) <==> 2 NO2 (g) Given that Kp=7.96×1012 for the reaction above and the following starting conditions: Initial Concentrations p(NO)=0.775 atm p(NO2)=0.000 atm p(O2)=0.789 atm Determine the equilibrium concentration of NO2.
March 7, 2014 by Haley

Math
A cylindrical tank has a height of 8 feet and a diameter of 2 3/4 feet. Use pi= 3.14 What is the lateral surface area? 69.08 square feet What is the lateral surface area ? 828.96 square inches How do i find: If a quart of paint covers 100 square feet, how many quarts of paint ...
May 15, 2008 by Mike

Physics Classical Mechanics
Attach a solid cylinder of mass M and radius R to a horizontal massless spring with spring constant k so that it can roll without slipping along a horizontal surface. If the system is released from rest at a position in which the spring is stretched by an amount x0 what is the...
December 11, 2013 by Anonymous

Physics (please check!!!)
Calculate the magnitudes of the gravitational forces exerted on the Moon by the Sun and by the Earth when the two forces are in direct competition, that is, when the Sun, Moon and Earth are aligned with the Moon between the Sun and the Earth. This alignment corresponds to a ...
April 28, 2011 by Bon Oncle

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