okay, i deem this answer logical n precise~ btw, if there is tunnel connecting 2 ends, passing the earth center..how will the gravitational force be like that we experiencing? because i remember the G is derived from the mass of 2 objects and the radius of the objects right? ...and, upon the "falling" to the earth center..the atmospheric pressure at certain depth would have crushed us right?

the 1st question of the latent energy i adopt the saying the m.p. will be lowered..if pressure down, m.p. still remains 0 degree...then when it comes to a pressure level where b.p. = 0 and m.p still remains 0...the water (*sorry, should be ice) will sublime at 0 degree? hmm...mayb i should brush up my elementary chemistry

the 2 cans question...i reckon the 2 cans require different initial forces to put them into same speed...since F=ma...

for the light speed question...if one's travelling faster than light...where does the light reflecting on the mirror come from? because the direction you running is towards another light source so literally bump into it? lol..this makes me want to ask the behaviour of light..as a photon and wave...does it travel at certain direction? or scattered? will the travelling speed be reduced gradually due to friction and eventually stop and how does the speed of light measured?

This post has been edited by Eved9: Jun 24 2009, 09:22 PM