Confirm Your Solving a Physics Problem

  • Thread starter Thread starter Matt1234
  • Start date Start date
  • Tags Tags
    Physics
Click For Summary

Homework Help Overview

The discussion revolves around a physics problem involving the application of an integral in the context of force and velocity. The original poster presents an equation related to momentum and attempts to solve for a final velocity, seeking confirmation of their answer.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the application of the integral and the correct use of signs in vector quantities. There are attempts to clarify the directionality of forces and velocities, with some questioning the original poster's reasoning and calculations.

Discussion Status

The conversation includes various interpretations of the problem, with some participants suggesting corrections to the original poster's approach regarding signs and direction. There is no explicit consensus on the final answer, but guidance has been provided regarding the application of vector principles.

Contextual Notes

Participants note the importance of direction in vector quantities and the potential for errors in sign conventions. The original poster's homework statement includes an image link, which may contain additional context not fully described in the text.

Matt1234
Messages
141
Reaction score
0
hello,

Homework Statement


[PLAIN]http://img526.imageshack.us/img526/6656/69304345.jpg


Homework Equations


m *v1 + integral Force dt = m v2

Ive tried several methods for this problem but keep coming up with 489.8 ft/s. Can someone confirm?
 
Last edited by a moderator:
Physics news on Phys.org
Your equation is correct, but your answer is not. I suspect you mixed up your plus/minus signs and put in the wrong value for the mass. If you could show your work, I can see where your error might be.
 
Hi there:

Here was my attempt.

[PLAIN]http://img256.imageshack.us/img256/1238/lastscannk.jpg

i think I am not applying the integral properly
 
Last edited by a moderator:
Your integral is fine...the error is all in the plus and minus sign. Since force and velocity are vectors, they have direction. The initial velocity is in what direction? The final velocity is in what direction? The net force is in what direction? Correct your signage and you'll be all set.
 
PhanthomJay said:
Your integral is fine...the error is all in the plus and minus sign. Since force and velocity are vectors, they have direction. The initial velocity is in what direction? The final velocity is in what direction? The net force is in what direction? Correct your signage and you'll be all set.

ok I am pretty sure the correct answer is 90 ft/s. Can you please confirm. My reasoning is that the initial quantity is negative and the impulse is positive and the final velocity is positive. (+ y direction) this was the convention i used.

Can you confirm?

Thank you for your assistance, i appreciate your help.
 
Matt1234 said:
ok I am pretty sure the correct answer is 90 ft/s. Can you please confirm. My reasoning is that the initial quantity is negative and the impulse is positive and the final velocity is positive. (+ y direction) this was the convention i used.

Can you confirm?

Thank you for your assistance, i appreciate your help.
Yes, excellent, good work. :approve:
 
great, thank you sir!
 

Similar threads

  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 17 ·
Replies
17
Views
3K
  • · Replies 13 ·
Replies
13
Views
6K
Replies
14
Views
3K
  • · Replies 3 ·
Replies
3
Views
2K
  • · Replies 10 ·
Replies
10
Views
5K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 69 ·
3
Replies
69
Views
6K
  • · Replies 2 ·
Replies
2
Views
5K
  • · Replies 14 ·
Replies
14
Views
3K