In part a, you determined that the heat added to the coffee is what you got. if it takes 4.2 j of energy to raise the temperature of 1.0 ml of coffee by 1.0∘c, then it should take twice as much energy to raise the temperature of 2.0 ml of coffee by 1.0∘c, or to raise the temperature of 1.0 ml of coffee by 2.0∘c. multiply carefully to find the total amount of energy needed to raise the temperature of 200 ml of coffee by the required number of degrees.

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