What is the acceleration of the object?

  • #1

Homework Statement



Consider a 3 kg object moving in a 2.5 m radius circle at 5.7 m/s to answer the next 2 questions.

4. How much force is required to keep the object moving in the circle?
1.3 N
3.3 N
39 N
6.8 N


5. What is the acceleration of the object?
13 m/s2
39 m/s2
6.8 m/s2
2.3 m/s2



Homework Equations



For the first one:
F=m*a
a=(v^2)/r = (5.7^2)/2.5 = 12.9996

thus, F=3*12.9996 = 38.988N


The Attempt at a Solution


I think I got the first one. Is that one the right answer? I can't figure out the second one though. Thanks for your help!
 

Answers and Replies

  • #2
6,054
391
You cannot figure out acceleration? What is 'a' then?
 
  • #3
662
307
Actually I think you have already got it. Just round your answer off.
(And some vector signs won't hurt...)
 
  • #4
Oh my gosh you're right. I did too much work lol. Thanks!!!!
 

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