On July 21, 1969, American astronaut Armstrong imprinted the first human footprints on the moon

Solution: Let the mass of the moon be m, the radius be r, and the gravitational acceleration of the surface be g, according to the law of gravitation, there is f=mg=gmm r

The centripetal acceleration of the uniform circular motion according to the command module is the gravitational acceleration on the surface of the moon, which has a=g=f m=(2 t) r

Then the mass of the Moon can be expressed as f=f 3t 4 16g 4m 3, therefore, the mass of the Moon can be estimated by the above equation when the gravitational constant g is known

Just know the gravitational constant of the moon, yes to between.

Analysis: Astronaut Collins piloted the command module, and the time of one near-moon flight on the surface of the moon was t, that is, the period was t, and the centripetal force or centripetal acceleration provided by the gravitational force of the moon was the formula a=

t2r, and the gravitational force is equal to gravity, according to these two series of equations Answer: Solution: Let the mass of the moon be m, the radius be r, and the surface gravitational acceleration be g, and the title has f=mg=gmmr2

The centripetal acceleration of the astronaut Collins piloting the command module around the moon a=g=fmt2r

From the above two equations, m= is obtained

f3t416π4gm3

So the answer is: m=

f3t416π4gm3

Comments: The key to solving this problem is to solve the column formula according to the gravity equal to the gravitational force and the gravitational force equal to the centripetal force

Now, decades have passed since Armstrong's moon landing, but it has been discovered that Armstrong's footprints on the surface of the moon have not disappeared, so why can the footprints be preserved for so long?

Neil armstrong.

Edwin Aldrin.

Michael Collins,4,3 astronauts Neil Armstrong Zeching, Buzz Aldrin and Michael Collins,2 On July 21, 1969, the American Apollo 11 spacecraft undertook the first manned mission to the moon. For the completion of this mission, three of the best astronauts were selected from 50 active astronauts. They are Neil A

Armstrong), Edwin EAdrin) and Michael Collins. Armstrong served as flight commander and Eldrin was the lunar module pilot.

On July 21, 1969, Armstrong and Eldrin landed on the moon aboard Apollo 11. 1. Neil A. ArmstrongArmstrong), Edwin E

Adrin) and Michael Collins,1,Liu Xiang,0,Neil Asun Oak Strong,Gagarin,Buzz Aldrin,0,July 21, 1969, the first human landing on the moon, do you know the names of these three astronauts?

Names are enough.

On July 20, 1969, three American astronauts successfully landed on the moon, after the first successful landing of Apollo 13 on the moon, in the following years, the Americans landed on the moon many times, plus the first three people on the moon, a total of 12 people left human footprints on the moon, but the only one that is really remembered and has the most profound influence is the first time! Everyone knows that the first person to land on the moon was American astronaut Armstrong, and when it comes to the second and third people to go to the moon, there may be very few people who know about it. When the Americans landed on the moon for the first time, a total of three astronauts reached the moon, two of whom went out of the capsule.

The second astronaut who landed on the moon was called Aldrin, and the third was Michael Collins.

American astronaut Neil Armstrong stepped out of the Apollo 11 lunar module and became the first human to set foot on the moon.

Armstrong walks out of the Awagai Ro-11 lunar module.

Therefore, Armstrong became the "first person to write the moon", but do you know who the "first person to write the moon" is? Next, let's turn the timeline back to the early Tang Dynasty and experience the cosmology of that era.

Answer] Good brother: c

On July 29, 1960, NASA released the "Apollo Program" to land on the moon.

Neil Armstrong, Michael Collins and Edwin Aldrin.

The U.S. Apollo 11 lunar module landed in the Moon's Still Sea. Armstrong, an astronaut, became the first human to set foot on the moon and the first to leave footprints on an alien planet. Armstrong Crater, 50 kilometers from the moon landing site, is named after Armstrong.

Armstrong's remark at the time, "It's a small step for a man, but a giant leap for a man," has become a classic discourse.

There were only two people on the moon for the first time, Neil Armstrong and Buzz Aldrin. Command module pilot Michael Collins only flew around the moon and did not land on the moon.

See Encyclopedia, Apollo 11.

I also want it, if you have any information, please send it to my mailbox.

a. There is no air and water on the moon, so you can't light a candle, which is not in line with the topic;

b. There is no air on the moon, and you can't fly a kite, which doesn't meet the theme;

c. Because the gravity on the moon is small and there is no air, it can achieve good results in the long jump or high jump, which is in line with the topic;

d. There is no air and water on the moon, and vegetables cannot be grown, so it does not meet the theme, so choose C