Phy 231
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.
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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: ->->->->->->->->->->->-> :
a = v^2/r
a = 30 cm/sec^2 /20 cm
a = (30 cm/sec_)^2 /20 cm, not 30 cm/sec^2 /20 cm; you calculated it correctly in any case
a = 45 cm/s/s
#$&*
• What is the magnitude and direction of the centripetal force required to keep it moving around this circle?
answer/question/discussion: ->->->->->->->->->->->-> :
Force = m*a
f = 110 g * 45 cm/s/s
f = 4950 g*cm/s/s
4950 g*cm/s/s = 0.0495 N
#$&*
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15 mins
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&#Good work. See my notes and let me know if you have questions. &#