Revised seed 251

course PHY 121

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?

110g * 30cm/s= 3300g cm/s

It will keep going in a circle

###This should be a=30cm/s^2 / 20cm =45cm/s^2 and it is going toward the center of the circle.

answer/question/discussion:

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

3300g cm/s / 20cm=165g cm/s

###This should be .110kg * .45m/s^2=49.5kg * m/s^2=49.5N

This indicates moving toward the center

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