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PHY 201
Your 'question form' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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`qx006. If the mass of your car and its load is 120 grams, then based on your calculated accelerations:
• What is the magnitude of the net force on the car as it travels down the incline?
****F(net)=ma; Fnet=120 g*83.7 cm/s^2=10044 g*cm/s^2
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• What is the magnitude of the net force on the car as it travels up own the incline?
****Fnet=120 g* -205.25 cm/s^2=24630 g*cm/s^2
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• What is the difference between the magnitudes of these two forces?
****14586 g*cm/s^2
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• What do you therefore conclude is the force due to friction?
• What would be the corresponding coefficient of friction?
**** if a_down= 83.7 cm/s^2, a_up=-205.25 cm/s^2, then mu for each respectively is 83.7cm/s^2/980 cm/s^2= .085 and down is -205.25 cm/s^2/980cm/s^2=0.21
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I have completed what I understand from this problem, at least what I think I understand, but given the magnitudes of the 2 forces, one up and one down the ramp, how do you determine the force due to friction?
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&#Good responses. Let me know if you have questions. &#
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Phy 201
Your 'question form' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.
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Suppose the disk rotated with a constant angular velocity, with an actual object moving along the tabletop just below the point on the disk. How would the velocity of that object change as the disk rotated through one complete revolution? Sketch (on your paper) and describe (below) a graph representing the velocity vs. clock time behavior of that point. Include an explanation connecting your results to your data.
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This is a question from the 9/27 lab where we did the disk rotating through 360 degrees and marked it on our pages. Somehow I missed completing/submitting this assignment. I don't understand the question. How would the velocity change? If the angular velocity was constant, would I need to solve as we did for the magnets on the strap through rotation? I'm very confused with this problme as you can tell.
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How do I solve for the velocity using the information I have?
The marks on the paper, below the point on the disk, will not be equally spaced. However the time interval between the marks will be uniform, since the marks are made at equal angular intervals of the disk's rotation. Since the angular velocity of the disk is constant, these equal angular intervals will be separated by a constant time interval.
Unequally spaced positions at equally spaced time intervals imply changing velocity.
If you still have questions, include a copy of your data and I can pose more specific questions for you.