cq_1_251

Phy 121

Your 'cq_1_25.1' report has been received. Scroll down through the document to see any comments I might have inserted, and my final comment at the end.

** **

A steel ball of mass 110 grams moves with a speed of 30 cm / second around a circle of radius 20 cm.

• What are the magnitude and direction of the centripetal acceleration of the ball?

answer/question/discussion: ->->->->->->->->->->->-> : v^2/r=cent. Acceleration, .3m/s^2/.2m=.45m/s^2, Fcent=.45m/s^2*.11kg…can only assume the “direction” of the acceleration is circular.

• What is the magnitude and direction of the centripetal force required to keep it moving around this circle?

answer/question/discussion: ->->->->->->->->->->->-> : Magnitude=.45m/s^2*.11kg or .05N. I don’t think I know, based on my thinking of the seed above, how to solve for direction…intuitively I don’t see why it is anything more than a circular path. I have a feeling you’ll have a little more accurate and complex explanation for me.

** **

20min

** **

Your feeling is correct. No revision necessary but check the link for the direction of that force:

&#Please compare your solutions with the expanded discussion at the link

Solution

Self-critique your solutions, if this is necessary, according to the usual criteria. Insert any revisions, questions, etc. into a copy of this posted document. Mark any insertions with &&&& so they can be easily identified. &#