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Why moon does not fall to Earth?
The moon does not fall to earth because of its tangential velocity. The following video explains it well.
The initiative http://lunarscience.nasa.gov/ask-a-scientist/ by NASA will answer all your doubts on moon.
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Is the gravitational force between moon & earth are equal ?
Is the gravitational force between moon & earth are equal ?
If the question is- “Is the force exerted by earth on moon is equal to the force exerted by moon on earth?” then the answer is “Yes”
I hope that more questions will follow.
Please post your questions as comments to this post.
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Parallax Method to determine the distance of stars
WHAT IS THE WAY TO MEASURE THE DISTANCE OF DISTANT OBJECTS LIKE STARS WITH THE HELP OF PARALLAX METHOD
SHWETANSU asked.
Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines.
Astronomers use the principle of parallax to measure distances to celestial objects including to the Moon, the Sun, and to stars beyond the Solar System.
See the animation below to understand the parallax method for determining the stellar distances
Find more information here
http://spiff.rit.edu/classes/phys240/lectures/parallax/parallax.html
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Questions received and waiting to be answered
Sreeda Asks
- Why are we not feeling Earth’s rotation while it is actually happening {1674.4 km/hr at the equator}?
- Our sound varies while communicating through a telephone. Why?
- Why is it more neat when we tear a sheet from the newspaper vertically and rough when torn horizontally?
- Will we be able to see stars during day time on the moon?
- Why do planets move in elliptical paths and not in circular ones?
- At what depth do Jupiter quakes occur?
Charan Asks
what is the difference between a atomic and a nuclear bomb?
sly nikie asks
what is crystal cleavage and what does it state about the nature of matter?
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A question from Gravitation.
Prince Patel Asked:
“Sun have high gravitational energy ,then why planets of solar system doesn’t colloid with sun?”
Answer:
“The planets are moving around the sun and the gravitational force is used in providing the necessary centripetal force (The force required by a body to move in a circular path). As long as the planets are in motion, they will not move towards the sun. A similar explanation hold good for moon going around earth also.”
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Weight and inertia on moon
Say True or False; An object on the Moon weights 1/6 of what it weights on the Earth. Therefore, the object has less inertia on the Moon.( Justify your answer)
Answer: The statement is false.
Inertia depends on mass and not on weight. The weight on moon is less not because of a decrease in mass, but due to the decrease in the acceleration due to gravity on the surface of moon.
Inertia depends on mass and there is no change in mass when a body is taken to moon. Therefore the inertia of a body is same on moon as that on earth or anywhere else in the universe, even in a gravity free space.
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Moon Landing
It is said that there is no atmosphere in moon therefore no air but when Neil Armstrong landed on moon first and hosted the us flag it flapped. how can this happen??
(See the photograph below)
The photograph below shows the photographs of flag taken from two different angles at slightly different times. Watch the curls and curves on flag. They have not changed
Vishnu Comments: “hosting could have sent a disturbance up the pole and thru the flag. Does it flap? we cant say that from a fotto. in moons surface, if we keep the flag with curls, the curls stays there. is there a vdo of flapping? After all its not worth discussing a lot over this”
Past Human Lunar Expeditions
Apollo 8 (21-27 December 1968)
Frank Borman, William Anders, James Lovell
Apollo 10 (18-26 May 1969)
Thomas Stafford, Eugene Cernan, John Young
Apollo 11 (16-24 July 1969)
Neil Armstrong, Edwin Aldrin, Michael Collins
21h 36m / 2h 31m / 21.6 kg
Apollo 12 (14-24 November 1969)
†Charles Conrad, Alan Bean, Richard Gordon
31h 31 m / 7h 45m / 34.3 kg
Apollo 13 (11-17 April 1970)
James Lovell, Fred Haise, †John Swigert
Apollo 14 (31 January – 9 February 1971)
†Alan Shepard, Edgar Mitchell, †Stuart Roosa
33h 30m / 9h 21m / 42.8 kg
Apollo 15 (26 July – 7 August 1971)
David Scott, †James Irwin, Alfred Worden
66h 54m / 19h 6m / 76.7 kg
Apollo 16 (16-27 April 1972)
John Young, Charles Duke, Thomas Mattingly
71h 2m / 20h 14m / 94.5 kg
Apollo 17 (7-19 December 1972)
Eugene Cernan, Harrison Schmitt, †Ronald Evans
74h 59m / 22h 2m / 110 kg
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Physics Masters
Vivek Sawhney
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