phy 121
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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: ->->->->->->->->->->->-> :
v^2 / r = 30cm/s^2 / 20cm = 45 cm/s^2
Magnitude is 45 cm/s^2 and the direction of the centripetal acceleration is towards the center of the circle.
• What is the magnitude and direction of the centripetal force required to keep it moving around this circle?
answer/question/discussion: ->->->->->->->->->->->-> :
m v^2 / r = F
.11 kg (30cm/s)^2 / 20cm = 4.95 Newtons
Magnitude is 4.95 Newtons and the direction of the centripetal force is towards the center of the circle.
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10 min
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&#Very good work. Let me know if you have questions. &#