
Elementary Math Fractions, Percentages, Word Problems, Equations, Inequations, Factorization, Expansion 
 LinkBack  Thread Tools  Display Modes 
November 10th, 2016, 02:46 PM  #1 
Newbie Joined: Aug 2015 From: Alberta Posts: 18 Thanks: 0  Kinetic Energy
I'm having trouble with calculating Kinetic Energy. River water with a mass of 100 tonnes is moving at 12.5km/h. What is its kinetic energy? E = 1/2mkw I got 100000 x 3.47 X .5 = 1735000 j But the real answer is suppose to be 602.7 kj. I don't get it. 
November 10th, 2016, 03:11 PM  #2  
Senior Member Joined: Sep 2015 From: CA Posts: 925 Thanks: 499  Quote:
$12.5 km/hr = 3.472 m/s$ $100 tonne = 100000 kg$ $E = \dfrac 1 2 (100000)(3.472)^2 = 602816.36 J = 602.8 kJ$ Last edited by romsek; November 10th, 2016 at 03:15 PM.  
November 15th, 2016, 05:39 AM  #3  
Math Team Joined: Jan 2015 From: Alabama Posts: 2,279 Thanks: 570  Quote:
Quote:
 

Tags 
energy, kinetic 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Questions about kinetic energy  GumDrop  Physics  2  July 26th, 2016 02:42 AM 
3D Energy  mark eaton24  Physics  21  December 7th, 2015 02:57 AM 
Is v in kinetic energy formula speed or velocity?  Mr Davis 97  Physics  2  April 30th, 2015 07:44 AM 
Kinetic and potential energy of an object  Mr Davis 97  Physics  3  April 20th, 2015 05:39 PM 
How was the formula for kinetic energy found, and who found it?  Ganesh Ujwal  Physics  3  January 5th, 2015 02:58 AM 