For full term US Senators, at noon on the 3rd day of January. see: http://www.senate.gov/reference/resources/pdf/termofasenator.pdf
I'm not aware that any Senators have been sworn into office on a coopy of the Koran. However, Representative Keith Ellison of Minnesota was sworn into office on a Koran, because he is Muslim.
Lyndon Johnson was sworn in office on Air Force One, but I do not know of any presidents sworn in out of the U.S.
Barack Obama was sworn in as the 44th US President.
Yes, there are 100 US Senators
2 state senators and there are 100 us senators 2 for every state
January 3rd is the day that all Senators are sworn into their offices after the election they won but only one-third of the senators in the Senate are sworn in at a time. Because for every election only one-third of senate seats are up for grabs and senators have six years terms and this way senate can not change completely to go with the United State's Checks and Balance system.
There are 100 senators in the us capitol!
US senators never elect the US president. Possibly some future senators or ex-senators once served as electors.
January
I dont know how long after the election, but he has to be sworn in by noon on the day of inauguration.
George Washington was 57 when sworn in as US President on April 30, 1789.
True, there are 100 US senators because there are 2 senators for 50 states.