http://politics.sgforums.com/forums/2297/topics/323692 en-US 60 <p>Even more info to above</p> <blockquote> <p>By using principle of conservation of energy?</p> </blockquote> <p>No, you will not be using any conservation of energy at all. Conservation of energy is invoked only when your equation is something like</p> <p>total initial energy = total final energy</p> Thu, 10 Jul 2008 09:34:34 +0800 politics.sgforums.com:2297:323692:8231571 eagle http://politics.sgforums.com/forums/2297/topics/323692 <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">Δmgh = mgΔh (as only the height changes)</span></p> <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">&nbsp;</span></p> <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">Δ in Energy = 10J</span></p> <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">&nbsp;</span></p> <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">10 = mgΔh</span></p> <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">&nbsp;</span></p> <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">Calculate the ‘m’ yourself</span></p> <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">&nbsp;</span></p> <p class="" style="margin: 0in 0in 0pt;"><span style= "color: #000000; font-family: Times New Roman;">PS: I just provide more explanation to wishboy answer.</span></p> Thu, 10 Jul 2008 09:32:21 +0800 politics.sgforums.com:2297:323692:8231564 Uncertain http://politics.sgforums.com/forums/2297/topics/323692 <p>Loss in GPE = mgh</p> <p>then sub in those values given to find m</p> <p>correct mi if im wrong &gt;&lt;</p> <p>&nbsp;</p> Thu, 10 Jul 2008 01:02:03 +0800 politics.sgforums.com:2297:323692:8231278 wishboy http://politics.sgforums.com/forums/2297/topics/323692 <p>When a stone drops to the ground from a height of 5 m, its gravitational potential energy decreases by 10 J. What is the mass of the stone?</p> <p>&nbsp;</p> <p>Tried to calculate the g.p.e at the top part, which is m X 10ms-2 X 5. but i don't have any idea how to go about doing the next step. By using principle of conservation of energy?</p> Wed, 09 Jul 2008 23:27:01 +0800 politics.sgforums.com:2297:323692:8231043 bonkysleuth http://politics.sgforums.com/forums/2297/topics/323692