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course phy 201
Honestly I believe even though we are not expected to get these right I still feel I need to resubmit this
A rubber band has no tension until it reaches a length of 7.5 cm. Beyond that length its tension increases by .7 Newtons for every additional centimeter of length. What will be its tension if its endpoints are at the points (5 cm, 9 cm) and (10 cm, 17 cm) as measured on an x-y coordinate system?
answer/question/discussion:
6.601 newtons
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You need to show how you get your answers. If the answers aren't right, usually all I can tell you is that the answer isn't right. Without knowing how you solved the problem I can't usually tell what you did.
However in this case it appears that you multiplied the length of the rubber band by .7 Newtons / cm; and it appears that you probably calculated the length correctly.
That isn't bad, but the problem says there is no tension until the rubber band reaches the 7.5 cm length.
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What is the vector from the first point to the second?
answer/question/discussion:
1.6
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This is not a vector. A vector has a magnitude and a direction, and is specified either by its magnitude and its direction relative to the positive x direction, or by its x and y components.
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Vectors were introduced in the Introductory Problem Set for Assignment 14.
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What is the magnitude of this vector?
answer/question/discussion:
9.43
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The vector from the first point to the second is 9.43 cm long, to three significant figures.
The units must be included.
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What vector do you get when you divide this vector by its magnitude? (Specify the x and y components of the resulting vector).
answer/question/discussion:
.17
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This is not a vector (see previous notes).
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The new vector should have magnitude 1. When you divide a vector by its magnitude the result is a vector with magnitude 1. We call a vector of magnitude 1 a unit vector. What vector do you get when you multiply this new vector (i.e., the unit vector) by the tension?
answer/question/discussion:
.51
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What are the x and y components of the new vector?
answer/question/discussion:
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This new vector is called the tension vector. It is a force vector which represents the tension. A force vector can be specified by its components, or equivalently by its magnitude and direction.
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Self-critique (if necessary):
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Self-critique rating:
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You need to review the information on vectors from Assignment 14, see the notes I've inserted here, then redo these questions.
&#Please see my notes and submit a copy of this document with revisions, comments and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end).
Be sure to include the entire document, including my notes. &#
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