1. If you double the frequency of wave with a 10 s period, what is be the new period (in seconds)? 2. What is the frequency (in Hz) of a heart's oscillations when beating at 72 beats per minute?

If an athlete runs once around a track, back to the starting line, her average velocity is zero. true or false?

The energy released by a nuclear fusion reaction is produced when

In a heat engine if 1000 j of heat enters the system and the piston does 500j of work, what is the final internal energy of the system if the inital energy was 2000 j1.write the equation2.list out your known variables 3. plug the numbers into the equations4.solve 5.write your solution statement that includes initial energy and final energy added.