- #1
Differentiate it
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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
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- Pulley pulley problem
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SUMMARY
The discussion centers on comparing the mass of cylinder B to block A using principles of mechanics, specifically involving a massless string and pulleys. Participants emphasize the importance of methodical problem-solving and defining relevant variables, such as the lengths of strings in the system. A discrepancy between calculated velocity (1.2 m/s) and the answer key (1.8 m/s) highlights the need for clarity in the application of the net work done by the massless string. Key questions regarding the fixed positions of pulleys and the attachment of the string to the axel of the large pulley are raised to clarify the setup.
PREREQUISITES- Understanding of Newtonian mechanics and forces
- Familiarity with the concept of net work in physics
- Knowledge of pulley systems and their mechanics
- Ability to define and manipulate variables in physics problems
- Study the principles of pulley systems in classical mechanics
- Learn how to calculate net work done by a system of strings and pulleys
- Explore the relationship between mass, acceleration, and tension in mechanics
- Review problem-solving techniques for physics homework, focusing on methodical approaches
Students studying physics, particularly those tackling mechanics problems involving pulleys and mass comparisons. This discussion is beneficial for anyone looking to improve their problem-solving skills in physics homework.
- #2
SammyS
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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
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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
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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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