Help needed with average acceleration question

  • #1
QUESTION=
a bird takes 8.5 s to fly from position A to position B along the path. determine the bird's average acceleration.

va= 4.4 m/s (3 degrees S of E) -- is this the initial velocity?
vb= 7.8 m/s ( 25 degrees N of E) -- is this the final velocity?

THIS IS WHAT I GOT SO FAR, I"M NOT SURE IF IT IS RIGHT AT ALL -->

ay = vfy - vfi / time

i found , ax = 0.52
ay = 0.92

a(2) = ax(2) + ay(2)
= (0.52)2 + (0.92)2
= 0.29 + 0.85
= √1.14 m/s(2)
therefore, average acceleration = 1.07 m/s


tan = 0.92 \ 0.52
tan = 60.4 degrees

Therefore the average acceleration of the car is 1.07 m/s (60.4 degreesN of E)
 

Answers and Replies

  • #2
335
4
christinaa_s said:
QUESTION=
a bird takes 8.5 s to fly from position A to position B along the path. determine the bird's average acceleration.

va= 4.4 m/s (3 degrees S of E) -- is this the initial velocity?
vb= 7.8 m/s ( 25 degrees N of E) -- is this the final velocity?

THIS IS WHAT I GOT SO FAR, I"M NOT SURE IF IT IS RIGHT AT ALL -->

ay = vfy - vfi / time

i found , ax = 0.52
ay = 0.92

a(2) = ax(2) + ay(2)
= (0.52)2 + (0.92)2
= 0.29 + 0.85
= √1.14 m/s(2)
therefore, average acceleration = 1.07 m/s


tan = 0.92 \ 0.52
tan = 60.4 degrees

Therefore the average acceleration of the car is 1.07 m/s (60.4 degreesN of E)
Just a quick comment: You somehow got your acceleration components wrong. I get ax = 0.314733 /s^2 and ay = 0.360723 m/s^2. (That's with E being the +x and N being the +y.) Perhaps you should show how you are putting the numbers into the equations.

-Dan
 

Related Threads on Help needed with average acceleration question

Replies
3
Views
1K
Replies
1
Views
806
Replies
4
Views
1K
Replies
2
Views
2K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
731
  • Last Post
Replies
1
Views
2K
  • Last Post
Replies
3
Views
2K
  • Last Post
Replies
5
Views
6K
Replies
1
Views
1K
Top