- #1
Mistakes in Kinematics Problem: A Lesson in Precision and Accuracy
- Thread starter alingy1
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Homework Help Overview
The discussion revolves around a kinematics problem involving time, displacement, and velocity calculations. Participants are analyzing potential mistakes in the problem's setup and calculations, particularly focusing on the use of time values and scientific notation.
Discussion Character
- Mixed
Approaches and Questions Raised
- Participants are questioning the use of a specific time value in calculations and whether it leads to correct displacement results. There are discussions about potential errors in speed calculations and the appropriateness of scientific notation used in the problem.
Discussion Status
The discussion is ongoing, with participants identifying various mistakes and inconsistencies in the problem. Some have offered insights into the nature of the errors, while others are confirming their observations. There is no explicit consensus, but multiple interpretations and corrections are being explored.
Contextual Notes
Participants mention that the problems are provided "at our own risk," indicating a lack of verification from the teacher. There are also concerns about the accuracy of the values presented in the problems, particularly regarding scientific notation and calculation errors.
- #2
Doc Al
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Looks like a mistake.alingy1 said:
- #3
- #4
Doc Al
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You are right. They made a mistake.alingy1 said:
What book are you using?
- #5
alingy1
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It's a bunch of review problems my teacher sent me "at our own risk."
But, since I'm not really an ace in physics, I try to confirm the mistakes as much as possible.
But, since I'm not really an ace in physics, I try to confirm the mistakes as much as possible.
- #6
alingy1
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Another mistake spotted?
They made a mistake with the *10^4. Should be 10^3. Angles do not change (they are good).
The final velocity should be 12.07m/s, IE 43.45 km/h.
By the way, should we not express scientific notation with only numbers from 1 to 9? Why do they put 10.1 x 10^4 etc...?
I'll refer this page to my class. They'll be glad :)
They made a mistake with the *10^4. Should be 10^3. Angles do not change (they are good).
The final velocity should be 12.07m/s, IE 43.45 km/h.
By the way, should we not express scientific notation with only numbers from 1 to 9? Why do they put 10.1 x 10^4 etc...?
I'll refer this page to my class. They'll be glad :)
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- #7
Doc Al
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I guess he didn't double check them for errors.alingy1 said:
Good idea. It's good practice.
- #8
Doc Al
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Yes, another mistake.alingy1 said:
As long as they do it right, it doesn't really matter. (Though you are correct.) But that's their first mistake: The momentum values are off by a factor of ten: they have 29.2 x 10^4 instead of 2.92 x 10^4, etc.
Good!