• Support PF! Buy your school textbooks, materials and every day products Here!

Kinetic Energy

  • Thread starter vandorin
  • Start date
  • #1
24
0

Homework Statement



What is the Kineti energy of a 1g (0.001kg) meteor traveling at 30,000m/s? Express your answer in Joules.

Homework Equations


KE=1/2MV^2


The Attempt at a Solution


1/2(.001kg)(30,000)^2 = 450000J


Now since 30,000 is squared, would i have to multiply .001kg by 4, before i did all of this math?
 

Answers and Replies

  • #2
354
0
Nope. You just plug .001kg in for M. Out of curiosity, why would you multiply by 4?
 
  • #3
24
0
I thought that since v is squared, you had to multiply the mass by 4.......or is that only if its 2v^2?
 
  • #4
240
1
I thought that since v is squared, you had to multiply the mass by 4.......or is that only if its 2v^2?
Nope, the one half is a separate term from the squared term:

KE = (1/2) * (m) * (v2)
 

Related Threads for: Kinetic Energy

Replies
2
Views
2K
Replies
4
Views
13K
  • Last Post
Replies
23
Views
1K
  • Last Post
Replies
8
Views
673
Replies
3
Views
1K
  • Last Post
Replies
1
Views
636
  • Last Post
Replies
3
Views
1K
  • Last Post
Replies
9
Views
1K
Top