Just a quick physics question

  • Thread starter ProBasket
  • Start date
  • #1
140
0
[tex]K = 1/2(1300kg)(10km/h)^2 + 1/2(1600kg)(6.6km/h)^2-1/2(2900)(8.12)^2 = 320J[/tex]


how is that 320J? when i plug that into my calculator, i get 4243.12(not sure what units this is in). can someone tell me why that K is 320 j?
 

Answers and Replies

  • #2
cepheid
Staff Emeritus
Science Advisor
Gold Member
5,192
38
You need to convert EVERYTHING into SI (MKS) units if you want your energy to be nicely expressed in joules at the end, you cannot just mix in km and hours.


Edit: and what do you mean you don't know what units your answer is in? Obviously it is in kg * km^2 / h^2, which is not a joule.
 

Related Threads on Just a quick physics question

  • Last Post
Replies
2
Views
900
  • Last Post
Replies
2
Views
3K
  • Last Post
Replies
6
Views
1K
  • Last Post
Replies
3
Views
2K
Replies
4
Views
2K
Replies
4
Views
923
Replies
3
Views
2K
Replies
3
Views
2K
Replies
2
Views
16K
  • Last Post
Replies
4
Views
2K
Top