Think about your own life, and the “scientific” inquiries that you’ve pursued. Can you think of examples where you have built on the knowledge of someone who came before you, and consciously taken it to the next step? Was this next step an improvement? Is there now a better understanding of this subject that you explored? Perhaps an activity you do is now more efficient, or you have created a better design? Write a paragraph about one or two of these experiences.

An athlete swings a ball, connected to the end of a chain, in a horizontal circle. the athlete is able to rotate the ball at the rate of 8.13 rev/s when the length of the chain is 0.600 m. when he increases the length to 0.900 m, he is able to rotate the ball only 6.04 rev/s. (a) which rate of rotation gives the greater speed for the ball? 6.04 rev/s 8.13 rev/s (b) what is the centripetal acceleration of the ball at 8.13 rev/s? m/s2 (c) what is the centripetal acceleration at 6.04 rev/s? m/s2