User Panel
User Panel
User Panel
|
Posted: 6/9/2013 7:16:04 PM EDT
[#1]
I haven't looked at this stuff for maybe 40 years, so I could be wrong, but isn't the sum of the object's potential energy and kinetic energy a constant?
|
|
|
|
Posted: 6/9/2013 8:43:37 PM EDT
[#2]
Total energy is potential + kinetic
Total energy remains constant. Before motion (at Max h), total is all potential. H turns into a, so at h=0, total is all kinetic |
|
|
|
Posted: 6/10/2013 12:09:35 AM EDT
[#3]
If I understand the question correctly you have a 2kg falling rock, and at a single instant in time you know that the total energy is 5000J and the potential energy is 1975J.
Total energy = kinetic + potential 5000J = kinetic + 1975J 5000J - 1975J = kinetic 3025J = kinetic |
|
|
|
Posted: 6/10/2013 12:15:36 AM EDT
[#4]
Total E= KE + PE
5000=KE+1975 KE=3025 (1/2)mv^2=KE (1/2)(2)V^2=3025 V=55 m/s PE=MGH 1975=2(9.8)H H=100.765 meters |
|
|
|
Posted: 6/10/2013 12:41:45 AM EDT
[#5]
Quoted:
Total E= KE + PE 5000=KE+1975 KE=3025 (1/2)mv^2=KE (1/2)(2)V^2=3025 V=55 m/s PE=MGH 1975=2(9.8)H H=100.765 meters That is what I ended up with. I knew I had seen total energy somewhere but I couldnt find it. When I got the square root of 3025 I knew I must be close. Thanks! |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
