Emily is testing her baby's bath water and finds that it is too cold so she adds some hot
water from a kettle on the stove. If Emily adds 2.00 kg of hot water at 80°C to 20kg of
bath water at 27°C, what is the final temperature of the bath water? (water Cp = 4,187
J/kg°C)

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