5. How much work is done by a student carrying a 12 kg backpack while accelerating at a rate of 0.51 m/s over a distance of 5.0 m? a. 750 J b. OJ c. 300 J d. 590 J 6. A paratrooper with a mass of 98 kg is descending to the ground below. How high above the ground is the paratrooper if he possesses 8.0 kJ of kinetic energy and 225 kJ of mechanical energy? a. 226 m b. 242 m c. 217 m d. 233 m - 7 . Which term describes the amount of thermal energy required to change a liquid into a gas or a gas into a liquid? a. specific latent heat of fusion b. latent heat of fusion c. latent heat of vaporization d. specific latent heat 8. It takes 3360 J of thermal energy to raise the temperature of 0.500 kg of glass by 8.0 C. What is the specific heat of glass? a. 840 J/kg . C b. 611 J/kg . C c. 747 J/kg . C d. 672 J/kg . C 9. Which type of radioactive decay emits a helium nucleus? a. beta-positive decay b. alpha decay