Motion problem -- Calculations given the v(t) graph of a person jumping

Click For Summary
The discussion revolves around a motion problem involving calculations based on a v(t) graph of a person jumping. The original poster seeks validation for their answers and expresses uncertainty about part b of the question. Respondents confirm that the calculations appear correct and suggest that square counting might be required, although it's deemed unlikely. Overall, the feedback reassures the poster that their work is solid. The conversation emphasizes the importance of accuracy in interpreting graphical data in motion problems.
shk
Messages
78
Reaction score
8
Homework Statement
I need someone to check my working for this question please.
Relevant Equations
a=v/t
Hi
I have answered the question and have attached my working .
I'm not very sure about part b. I generally need someone to check my working and let me know if I've made a mistake.
Thanks
 

Attachments

  • Screenshot_20201021-095044_WhatsApp.jpg
    Screenshot_20201021-095044_WhatsApp.jpg
    90.9 KB · Views: 150
  • 20201021_095342.jpg
    20201021_095342.jpg
    19.4 KB · Views: 151
Last edited by a moderator:
Physics news on Phys.org
Looks good. Since it is on graph paper, they might want you to do some square counting, but unlikely.
 
  • Like
Likes shk and Marso
Everything seems in order!
 
  • Like
Likes shk
haruspex said:
Looks good. Since it is on graph paper, they might want you to do some square counting, but unlikely.
Thanks for the comment 👍
 
Marso said:
Everything seems in order!
Thank you very much
 
The book claims the answer is that all the magnitudes are the same because "the gravitational force on the penguin is the same". I'm having trouble understanding this. I thought the buoyant force was equal to the weight of the fluid displaced. Weight depends on mass which depends on density. Therefore, due to the differing densities the buoyant force will be different in each case? Is this incorrect?

Similar threads

  • · Replies 9 ·
Replies
9
Views
472
  • · Replies 5 ·
Replies
5
Views
2K
Replies
19
Views
3K
Replies
6
Views
2K
Replies
5
Views
2K
  • · Replies 19 ·
Replies
19
Views
1K
Replies
1
Views
1K
Replies
1
Views
2K
  • · Replies 5 ·
Replies
5
Views
2K
Replies
12
Views
2K