Phy 121
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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I'm working on the assignment number 10, week 5 quiz #1 and I'm confused on what steps I should take. A ball starting from rest rolls 13 cm down an incline on which its acceleration is 27 cm/s2, then onto a second incline 39 cm long on which its acceleration is 13 cm/s2. How much time does it spend on each incline?
I wasn't sure if I do 27 cm/s^2/13 cm= 2.08 s2 and 39 cm/13 cm/s^2=3 s2.
You wouldn't do either calculation. a / `ds, i.e., acceleration / displacement is not a useful calculation.
To solve the problem you will need to consider one incline at a time.
See if you can answer the following questions (you are also welcome to speculate and ask questions of your own):
Consider the first incline:
Which quantities, of the five quantities v0, vf, a, `dt, `ds, do you know about the motion on the first incline?
answer:
Can you list the four equations of uniformly accelerated motion?
answer:
Can you then identify which equation(s) contain three known and only one unknown quantities?
answer:
Can you solve at least one of those equations for that unknown?
answer:
Can you then use your result to either reason out or solve for the other unknown?
answer:
Can you then determine which three quantities are known for the second incline?
answer:
Can you then follow the same procedure to find the remaining quantities for that incline?
answer:
&#Please see my notes and submit a copy of this document with revisions and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end). &#
Phy 121
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.
** **
** **
** **
I'm working on the assignment number 10, week 5 quiz #1 and I'm confused on what steps I should take. A ball starting from rest rolls 13 cm down an incline on which its acceleration is 27 cm/s2, then onto a second incline 39 cm long on which its acceleration is 13 cm/s2. How much time does it spend on each incline?
I wasn't sure if I do 27 cm/s^2/13 cm= 2.08 s2 and 39 cm/13 cm/s^2=3 s2.
You wouldn't do either calculation. a / `ds, i.e., acceleration / displacement is not a useful calculation.
To solve the problem you will need to consider one incline at a time.
See if you can answer the following questions (you are also welcome to speculate and ask questions of your own):
Consider the first incline:
Which quantities, of the five quantities v0, vf, a, `dt, `ds, do you know about the motion on the first incline?
answer:
Can you list the four equations of uniformly accelerated motion?
answer:
Can you then identify which equation(s) contain three known and only one unknown quantities?
answer:
Can you solve at least one of those equations for that unknown?
answer:
Can you then use your result to either reason out or solve for the other unknown?
answer:
Can you then determine which three quantities are known for the second incline?
answer:
Can you then follow the same procedure to find the remaining quantities for that incline?
answer:
&#Please see my notes and submit a copy of this document with revisions and/or questions, and mark your insertions with &&&& (please mark each insertion at the beginning and at the end). &#