7. Radon has a half life of 3.8 days. After 7.6 days, 6.5g remain. What was the mass of the original sample? HL: 3.8 Start! End: 6.5 Total:7.6

Does work output exceed work input when a machine is used? a) yes, it does, as machines create energy. b) it depends on the type of machine used. c) no, it doesn’t, as machines are inefficient. d) no, it doesn’t, as machines cannot create energy.

Describe uniform velocity and variable velocity in short

Which of these is not a possible type of energy transformation? a. electrical energy into light energy b. sound energy into nuclear energy c. potential energy into kinetic energy d. kinetic energy into mechanical energy