Dolphins emit clicks of sound for communication and echolocation. a marine biologist is monitoring a dolphin swimming in seawater where the speed of sound is 1517 m/s. when the dolphin is swimming directly away at 6.8 m/s, the marine biologist measures the number of clicks occuring per second to be at a frequency of 2810 hz. what is the difference (in hz) between this frequency and the number of clicks per second actually emitted by the dolphin?

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.