The freezing point of water is 0ác, and the boiling point is 100ác. this range of temperatures can be found naturally on the earth, which means
a. water makes up less than 30% of the earth's surface.
b. water cannot move through the roots of plants.
c. water can exist in all three states on earth.
d. water has a very low specific heat.

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