Physics, 28.01.2020 08:31, kcjr

Why does the moon only take 27.3 days to revolve around the earth but 29.5 days to go through the full moon phases

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Here's a brief Start at the full Moon. The Moon moves through its orbit and finds itself in the same position relative to the Earth that it was in at the last full Moon. But the Earth has also moved, in its orbit around the Sun, over the same period of time. So, the Moon has to go farther than 360 degrees of orbit in order to get to that full Moon position again. The cycle of phases is about 29.5 days. After 27.3 days, the Moon has revolved through a full 360 degrees relative to the stars.
When a body orbits another and moves to the point where it is in the same position relative to the Sun, that is the "synodic period". The Moon phase cycle is a synodic period. When a body orbits another a full 360 degrees relative to the distant stars, that is a "sidereal period".

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answered: Guest

sleep paralysis is a parasomnia, events associated with sleep.

sleep paralysis happens when you are in the middle of waking up or falling asleep. it is the feeling of being conscious but unable to move. it definitely involves hallucinations.

i had a friend that had sleep paralysis and he told me a story one time where he was laying in bed and he couldn't move his body no matter how hard he tried and there was someone standing in the corner of his room coming towards him. he couldn't move and you can't "wake up" because you are already conscious. sometimes sleep paralysis can be triggered by frequent waking up during the night based off of multiple trips to the bathroom, or if you had ever been abused, sleep paralysis can start happening from things like that.

answered: Guest

-first use of geothermal energy occurred more than 10,000 years ago in north america by american paleo-indians

-the first industrial use of geothermal energy began near pisa, italy in late 18th century

-in 1904, italian scientist piero ginori conti invented the first geothermal electric power plant in which steam was used to generate the power

-with the above experiment, the first geothermal plant in usa started in 1922 with a capacity of 250 kilowatts

-however, in 1946 first ground-source geothermal heat pump installed at commonwealth building in portland, oregon

-during the 1960’s, pacific gas and electric began operation of first large scale geothermal power plant in san francisco, producing 11 megawatts

-in 1973, when oil crisis began many countries began looking for renewable energy sources and by 1980’s geothermal heat pumps (ghp) started gaining popularity in order to reduce heating and cooling costs

-as effect of climate change started showing results, governments of various countries joined hands to fight against it, for which kyoto protocol was signed in japan in 1997, laid out emission targets for rich countries and required that they transfer funds and technology to developing countries, 184 countries have ratified it

hope this