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1a converging lens with a focal length of 31 cm is used to image an object which is 34 cm away from the lens how far
question 1 one hundred years ago many scientists believed that the universe was infinite and eternal with no beginning
1we have heard of simple toy models of the universe that were studied by einstein de sitter and friedman if our
1 derive strirlings approximation for n2 derive the gaussian approximation of the binomial distribution3 derive
everyculture since the beginring of civilization has sought to understand the world through stories stories which gave
how do you understand the term paradigm what kuhn mean by this term identify a paradigm in your particular discipline
assume that the energy density in the universe is a power-law in the scale factorepsilon epsilonoalphanwhere n can be
1 consider a flat universe with only mattera prove that epsilonepsilone0a-3 where epsilone0 is the critical density
at the galaxys core astronomers have observed a small massive object at the center of the milky way galaxy a ring of
1 a singly charged positive ion has a mass of 2510-26kg after being accelerated through a potential difference of 250v
junior high studetn needs help with understanding concept behind grvaity help with following basic questions in simple
there are a pair of identical twins one remains on earth while the other goes on an extended trip through the galaxy
what is the size of an object located at a distance10 km if it has an angular size a of 2 degrees and use hubbles law
if a galaxy has a luminosity of 66x1039 w and a brightness measured as 125x10-11 w m-2 how far away is the galaxy in
suppose a blazar at z100 goes through a fluctuation in brightness that lasts one week 168 hours as seen from eartha at
the andromeda galaxy also known as m31 is the nearest spiral galaxy to the milky way and the most distant object
1 what is the significance of studying active versus normal galaxies explain2 do you think that our galaxy has ever
need help with the following questions by describing the evolution of earth the sun the moon planets and other bodies
the gas shell of a planetary nebula is expanding away from the central star at 20 kms the nebula currently has a
1 do all stars emit the same energy throughout the electromagnetic spectrum2 an h-r diagram plots luminosities of stars
i briefly explain why a star of mass 05a1 collapses to form a white dwarf when the nuclear reactions in its core
1 explain why the absorption lines of an element have the same wavelengths as the emission lines of that element2 make
problem 1 bob is watching anna y by in her high-speed plane which anna knows to be 70 m in length as a greeting anna
a briefly describe three ways that distances to stars can be measuredb name an object not man made that emits light in
a newtonian telescope uses a curved mirror to focus light from a star a flat mirror called a secondary mirror