Calculating the Impulse (Magnitude and direction) question - Thanks

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SUMMARY

The discussion centers around calculating impulse, specifically its magnitude and direction, in a physics homework problem. The participant struggles to apply the impulse formula, which is defined as the change in momentum (ΔP = m(Vf - Vi)). They attempt to solve the problem using the equation ΔPx = m(Vfx - Vix) and provide specific values, but encounter difficulties in the calculations. The conversation highlights the importance of correctly applying the impulse-momentum theorem in problem-solving.

PREREQUISITES
  • Understanding of impulse and momentum concepts in physics
  • Familiarity with the impulse-momentum theorem
  • Basic algebra skills for manipulating equations
  • Knowledge of trigonometric functions, particularly sine
NEXT STEPS
  • Review the impulse-momentum theorem in physics textbooks
  • Practice solving problems involving impulse and momentum
  • Learn how to apply trigonometric functions in physics calculations
  • Explore online resources or videos explaining impulse calculations
USEFUL FOR

Students studying physics, particularly those tackling problems related to impulse and momentum, as well as educators seeking to provide clearer explanations of these concepts.

nukeman
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Homework Statement



Below is a snapshot of the question I can't seem to solve.

2130p6c.jpg


I can't seem to find in my textbook how to work out this problem...:(

Any pointers? Thanks!



Homework Equations





The Attempt at a Solution

 
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nukeman said:

Homework Statement



Below is a snapshot of the question I can't seem to solve.

2130p6c.jpg


I can't seem to find in my textbook how to work out this problem...:(

Any pointers? Thanks!



Homework Equations





The Attempt at a Solution


What is the mathematical definition of the impulse?
 
Impulse is the change in momentum
 
nukeman said:
Impulse is the change in momentum

Show us the equation(s). That would be what you should have put in the "Relevant Equations" part of the Homework Help Template above...

Then tell us what you think you should do with the equation(s). That would go in the last part of the HH Template...
 
Is this correct??

ΔPx = m(Vfx - Vix) = .60(-v sin 65 - v sin 65)

= -2mvsin65

-2(.60)(5.4)(.90) = - 5.8


Ok now I am gettin stuck?
 
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?

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