Donate SIGN UP

amyskinner

1 to 8 of 8

Avatar Image
amyskinner

at what speed was the ???????????

A ball is thrown vertically upwards into the air. It rises a vertical distance of 2.7 m before falling to the ground. Assuming that all of the ball's initial kinetic energy is converted into...
00:13 Sun 31st May 20098 answers, last by vascop 18:54 Sun 31st May 2009
Avatar Image
amyskinner

geological past help please

which is the one statement that correctly provides a piece of evidence that the continents have drifted in the geological past. 1) The presence of humans on all the continents indicates that the...
02:01 Sat 30th May 20093 answers, last by Teddio 00:36 Sun 31st May 2009
Avatar Image
amyskinner

igneous rocks query

Why do intrusive igneous rocks have larger crystals than extrusive ones?
01:39 Sat 30th May 20092 answers, last by tamborine 03:33 Sat 30th May 2009
Avatar Image
amyskinner

rock crystals query

Why do intrusive igneous rocks have larger crystals than extrusive ones?
02:18 Thu 28th May 20092 answers, last by Clanad 15:05 Thu 28th May 2009
Avatar Image
amyskinner

the founder effect help (real urgent)

Write a short account on what is meant by the term founder effect and outlines the evidence which suggests that modern man is descended from a small founding population originating from Africa. Any...
00:43 Wed 27th May 20091 answer, last by dr b 00:51 Wed 27th May 2009
Avatar Image
amyskinner

Detecting planets around other stars help

The position of the Ralos System is such that it allows the inhabitants of Htrae to observe a far-away star known as eDf456 (this is the star that we know as the Sun). (Q) The people of Htrae suspect...
14:56 Mon 25th May 20092 answers, last by jake-the-peg 09:30 Tue 26th May 2009
Avatar Image
amyskinner

radioactive elements help (urgent)

Amongst the radioactive elements that were incorporated when the Earth was formed were: uranium 238U with a half-life of 4.5 ? 109 y uranium 235U with a half-life of 7.1 ? 108y thorium 230Th with a...
13:20 Mon 25th May 2009
Avatar Image
amyskinner

radioactive elements help (urgent)

Amongst the radioactive elements that were incorporated when the Earth was formed were: uranium 238U with a half-life of 4.5 ? 109 y uranium 235U with a half-life of 7.1 ? 108y thorium 230Th with a...
13:18 Mon 25th May 20092 answers, last by jake-the-peg 09:06 Tue 26th May 2009

1 to 8 of 8