When the water is heated for a period of time, the temperature of the water rises gradually from an initial temperature of 25°C. When the temperature starts to rise initially, the balloon is deflated further. After heating for a period of time, the balloon becomes fully inflated as shown in Fig. 8.2. (i) Explain why the balloon deflated further when the temperature starts to rise.
(ii) Explain why the balloon becomes fully inflated as shown in Fig. 8.2.

Abasketball star covers 2.65 m horizontally in a jump to dunk the ball. his motion through space can be modeled precisely as that of a particle at his center of mass. his center of mass is at elevation 1.02 m when he leaves the floor. it reaches a maximum height of 1.90 m above the floor and is at elevation 0.910 m when he touches down again. (a) determine his time of flight (his "hang time"). (b) determine his horizontal velocity at the instant of takeoff. (c) determine his vertical velocity at the instant of takeoff. (d) determine his takeoff angle. (e) for comparison, determine the hang time of a whitetail deer making a jump with center-of-mass elevations yi = 1.20 m, ymax = 2.45 m, and yf = 0.750 m.