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 Special and General Relativity Special and General Relativity Physics Help Forum

 Dec 24th 2010, 12:51 AM #1 Junior Member   Join Date: Dec 2010 Posts: 6 modern physics... plz help! Q). A certain strain of bacteria doubles in number each 20 days. Two of these bacteria are placed on a spaceship and send away from earth for 1000 earth days. During this time the speed of the ship was 0.9950 c. How many bacteria would be aboard when the ship lands on the earth? the answer given is 64 .
 Dec 24th 2010, 01:01 AM #2 Junior Member   Join Date: Dec 2010 Posts: 6 how is the speed of spaceship related to the doubling time of bacteria in the above question? one more doubt i have.... Q). A dust particle of mass 0.01g is enclosed in a cubical box of side 1 cm. The lowest energy (J) associated with the particle will be?(h=6.62 x 10^-27 erg s) can it be solved as.... energy= hc/lambda , where lambda could be taken as 1 cm?? if this is the way it should be....what is the use of MASS of the particle?? plz tell me if i am going right because the answer has not been provided in the book thank you Last edited by physics21; Dec 24th 2010 at 01:11 AM.
 Dec 24th 2010, 03:24 AM #3 Member   Join Date: Jul 2009 Posts: 72 the first question is about relativistic time dilation as the ship is moving close to the speed of light, time psasses slower in the ship than on earth you need to figure out how much time has passed in the ship if on earth passed 1000 days you should use t'=t/sqrt(1-vē/cē)
 Dec 24th 2010, 06:46 AM #4 Junior Member   Join Date: Dec 2010 Posts: 6 Thank you Haytham!

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