Recent content by lebbo

yea i get wat ur doing ur sayin momentum before=momentum after

ok i think R=M/T and therefore F=(R)(Vex) Vex is the velocity when the rocket loses the fuel because it goes faster with less weight total momentum intial= (M+m)V=0 total momentum final=M(V+v)=0 therefore total momentum: (M+m)V=M(V+v) m : this is delta m is the fuel (before and...

sry about that we know that rockets momentum final= R then the F= R/t were R is the rate of fuel consumption and F is the total thrust am i gettin there ?

Can some one help me with this question please. don't really understand mathematically analyse, using diagrams, rockets burning in terms of momentum conservation and the rate of fuel consumption R and derive the acceleration for a rocket during its launch stage.

thanks iv got it now, the retrograde causes Mars to get brighter when in oppostion of the sun and earth

ok In both models Mars is closest to Earth at opposition and i know that ptolemaic model use epicycles also that Earth is always in the middle of the sun and Mars which makes it brighter i think i m really confused on this question

k thanks a lot for ur help

ok thanks last one it is observed that Mars is somewhat brighter when in opposition (ie. sun- Earth - Mars in that order) that at other times. How can this be explained using a) The Ptolemaic model and b) The Copernican model of the solar system. (Assume that Ptolomy's construction...

can u help me with this imagine that the universe is static and not expanding. predict the observations that would be made in regards to: a)red shift in galaxy spectra b)temputer of cosmic backround radiation

Thanks tony873004 that makes so much sense know

it is observed that Mars is somewhat brighter when in opposition (ie. sun- Earth - Mars in that order) that at other times. How can this be explained using a) The Ptolemaic model and b) The Copernican model of the solar system. (Assume that Ptolomy's construction describes the actual motion...

so how does the moon effects the earth i know it effects it by tides but are there any others and how does it make Earth have two tides every day i am very confused

examine the truth of the statement "the moon moves in a near-circular orbit around earth. because the Earth is so much more massive, it own motion is not appreciably affected by the moons presence" please help

thanks 4 da help

examine the truth of the statement "the moon moves in a near-circular orbit around earth. because the Earth is so much more massive, it own motion is not appreciably affected by the moons presence" please help