Recent content by madman143

Why can't trajectories in phase space intersect?

If I suppose number of civilizations at the present time (ignoring light travel time) is 10-4. (drake equation) Where the civilizations lifetime is 1000 years. Then over the history of the galaxy, Number of civilizations over the galactic history=N* Galactic lifeitme (1010)/ Lifetime of...

I was wondering if anyone could indicate me towards recent(and respectable) findings over the number of Earth type planets in the galaxy. examples of exoplanet studies and the like would be great. thanks a lot. And also findings on the number of exoplanets surrounding stars would be most...

there is a theory on multiple genesis. however there is no evidence to the contrary. i have followed up the article and it does not lead to a verifiable source. So absence of evidence is evidence of absence as it is very probable that we do have evidence. the best way to rectify this is to find...

Yes, that is surely true. I was just trying to clear the air as in there are no dormant or inactive galaxies asa most readers have suggested.

Eh, quasars are not galaxies but rather a sub-selection of AGN. There are no inactive or dormnat galaxies. Most galaxies are classified by type. For example, A elliptical galaxy will be less active than a spiral one.

The evidence commonly presented for the formation of life (Fl term of Drake equation) 1.Life formed virtually as soon as possible on Earth (when conditions were suitable) It implies that life is easy to form when we have the right conditions [Does the Rapid Appearance of Life on Earth Suggest...

thats why i called myself madman, innit. anyway, here are the question, if anyone can have a go at them, id be greatful.. 1.Find the speed v_f of the centre of mass of the stick+puck combination after the collision. Express v_f in terms of some of the following quantities: v_0, m_p, m_s, and L...

Homework Statement Please help. Have no clue? A hockey stick of mass m_s and length L is at rest on the ice (which is assumed to be frictionless). A puck with mass m_p hits the stick a distance D from the middle of the stick. Before the collision, the puck was moving with speed v_0 (note: a...

Homework Statement Jeanette is playing in a 9-ball pool tournament. She will win if she sinks the 9-ball from the final rack, so she needs to line up her shot precisely. Both the cue ball and the 9-ball have mass , and the cue ball is hit at an initial speed of . Jeanette carefully hits the...

Homework Statement A uniform board of length and mass lies near a boundary that separates two regions. In region 1, the coefficient of kinetic friction between the board and the surface is , and in region 2, the coefficient is . The positive direction is to the right.(Image uploaded)...