- #1
Differentiate it
- 63
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- Homework Statement
- Could someone help me out with this?
- Relevant Equations
- -
How does the mass of cylinder B compare to the mass of block A?
- Thread starter Differentiate it
- Start date
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- Tags
- Pulley pulley problem
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Homework Help Overview
The discussion revolves around comparing the mass of cylinder B to the mass of block A, with participants exploring the dynamics involved in a pulley system. The context suggests a focus on the relationships between the components of the system and the implications of their masses on motion.
Discussion Character
- Exploratory, Assumption checking, Problem interpretation
Approaches and Questions Raised
- Participants discuss the use of net work done by a massless string and question the discrepancies in calculated speeds. There are inquiries about the setup of the pulleys and their fixed positions, as well as the relationships between the lengths of the strings involved.
Discussion Status
The discussion is ongoing, with participants seeking clarification on the setup and relationships within the pulley system. Some guidance has been offered regarding the need for methodical definitions of variables and the importance of understanding the physical relationships at play.
Contextual Notes
Participants note the lack of specific information regarding the initial attempts and the need for further details about the configuration of the pulleys and the strings involved in the problem.
- #2
SammyS
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Science Advisor
Homework Helper
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Yes, someone can, but we need to see your attempt at solving this before we can begin to help.Differentiate it said:
- #3
Differentiate it
- 63
- 2
Well I used the Net work done by a massless string thing and i seem to be getting 1.2 m/s instead of the 1.8 m/s shown in the answer keySammyS said:
- #4
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it helps to be very methodical with such questions.
Define variables for the lengths of string of interest. There's the string running from the large pulley to the rightmost pulley, the string from the centre if the large pulley to the other small pulley, the string running from the bottom of the large pulley to the bottom of that same small pulley, and the vertical string.
What fact relates those four lengths?
What fact relates the first two?
What fact relates the second and third?
Define variables for the lengths of string of interest. There's the string running from the large pulley to the rightmost pulley, the string from the centre if the large pulley to the other small pulley, the string running from the bottom of the large pulley to the bottom of that same small pulley, and the vertical string.
What fact relates those four lengths?
What fact relates the first two?
What fact relates the second and third?
- #5
SammyS
Staff Emeritus
Science Advisor
Homework Helper
- 11,987
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That isn't much information regarding the specifics or your attempt. Rather than ask about how you used and obtained the Net work of the massless string, I'll ask some questions regarding the objects shown in the figure.Differentiate it said:
It looks like the two small pulleys are fixed in position relative to the bench/table. Is that correct?
Is the axel of the large pulley a fixed distance from block A ?
Is the string attached to the axel of the large pulley at one end and cylinder B at the other end?
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