× Didn't find what you were looking for? Ask a question
Top Posters
Since Sunday
G
4
K
3
o
3
3
m
2
c
2
r
2
p
2
s
2
s
2
b
2
c
2
Home Q & A Board Science-Related Homework Help Physics
New Topic  
rkearl27 rkearl27
wrote...
Posts: 165
Rep: 1 0
11 years ago
A drum major twirls a 91-cm-long, 480 g baton about its center of mass at 140rpm .

What is the baton's rotational kinetic energy?
Express your answer using two significant figures.
Read 6850 times
1 Reply

Related Topics

Replies
RJ
wrote...
#1
11 years ago
KE = (0.5) ( i ) (W)^2

I = the inertia of the object, a rod is (1/12) ( M ) ( R^2 )
W = (rpm*2*pi)/60

so, w = (140 * 2 * pi)/60 = 14.66
so, i = (1/12) * 0.48 * 0.91 = 0.0364

0.5 * 0.0364 * 14.66^2 = 3.91187

have fun on mastering physics, i hate it too!
New Topic      
Quick Reply
Explore
Post your homework questions and get free online help from our incredible volunteers
  1001 People Browsing
Start New Topic Take the Tour CoursesNew Study Tools Topics Trending Browse by Textbook
Live Chat
Related Images
  
 975
  
 1563
  
 1512
Your Opinion
Which of the following is the best resource to supplement your studies:
Votes: 300
Previous poll results: Which industry do you think artificial intelligence (AI) will impact the most?