1) The following (fake) chemical equation is not balanced: AD₂ + R₃ A₂R₂ + D. After balancing, this chemical equation is _____.

a)6 AD₂ + 2 R₃ 3 A₂R₂ + 6 D₂

b)A₆D₁₂ + R₆ A₆R₆ + 12 D

c)6 AD₂ + 2 R₃ 3 A₂R₂ + 12 D

d)3 AD₂ + 2 R₃ 3 A₂R₂ + 4 D

2)Two bowling balls, each with a positive charge of 2.5 x 10^-5 C, are located 28.0 cm apart. The size of the electric force between them is _____ N. Report your answer to 2 decimal places.

3) A rock of mass 2.00 kg is dropped from a stationary hot air ballon. Its potential energy at the top is 18,000 J. When its potential energy is 10,000 J, the rock is falling at _____ m/s. Report your answer to 2 decimal places.

4) The specific heat of a particular metal alloy is 0.29 calories per gram per degree Celsius. Calculate the amount of heat required (in calories) to raise the temperature of 3.9 kg of this material by 18 degrees. Report your answer to 2 decimal places.

5) A water wave oscillates up and down once every 1.50 seconds. The distance between wave crests is 2.90 m. The speed of this wave is _____ m/s. Report your answer to 2 decimal places.