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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
Lunar landing flag

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










What happens when we suck in water from a drinking straw that has a hole in it?And why?

Let’s first see what happens when we “suck” in water using a straw. We are actually reducing the pressure inside the  mouth. When we do not suck, the pressure on the surface of water and inside our mouth will be the same.

The Physics of Drinking with strawBut when we start to suck, the pressure inside the mouth is reduced and water is pushed into our mouth due to the greater pressure on the surface of water caused by the atmosphere.

If there is a hole, we are not able to produce a low pressure area inside our mouth by sucking in.

Acceleration due to gravity

Does the acceleration due to gravity remains constant within the earth’s atmosphere or does it keep decreasing as we go up from the earth’s surface?

Rashshad Rasheed


No acceleration due to gravity decreases as we go up from the earth’s surfacs

Variation of acceleration due to gravity with height

I want to ask that does the acceleration due to gravity remains constant within the earth’s atmosphere or does it keep decreasing as we go up from the earth’s surface?

Rashshad Rasheed asked

Change in Barometric Height with position

Biswaroop Dasgupta asks:

“How would the barometric height change when a mercury barometer is taken to a mine? Give reasons to explain.”

Answer: Barometer is a device used to determine the atmospheric pressure. The atmospheric pressure is calibrated in terms of height of mercury column in the barometer.

Atmospheric pressure is the weight of air acting normally per unit area on the surface ofof earth or the point under consideration.

Inside a mine, the weight of air above the point will be more than that on the surface of earth. Therefore, the barometric height increases when taken to a mine.

Why don’t we get a shock when we step out of house?

the top of the atmosphere is at about 400kv with respect to surface of the earth,corresponding to an electric field that decreases with altitude. near surface of the earth the field is about 100v/m. why then do we not get an electric shock as we step out of our house into open?

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