Your lab manual has a picture of the apparatus used in this lab. Figure 1 shows

Question

Your lab manual has a picture of the apparatus used in this lab. Figure 1 shows the apparatus when it is not spinning. When it is spinning and the spinning speed is just right, the apparatus looks like in Figure 2, where the string is vertical. You use a stop watch to measure the total time for 20 revolutions, and the stop watch reads 13.68 seconds. (a) (1 point) Find the period of the circular motion. (b) (1 point) If the radius of the circular motion is 16 cm, find the speed of the circular motion Figure 1: not spinning tension elastic (c) (1 point) Calculate the magnitude of the centripetal acceleration. weight Figure 2: spinning (d) (1 point) If the mass M 200 g, calculate the magnitude of the centripetal force. (e) (1 point) In Figure 2, which force is the centripetal force?

Explanation / Answer

a) The Period is equal:

T = t / # Oscillation

Then we have

T= 13.68 seg/ 20 rev = 0.684 seg

Finally the answer is

T= 0.684 seg

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