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# Wave,Work,Power voc.

### Lillian Malone

Question | Answer |
---|---|

What is a wave? | A wave is a disturbance that transfers energy. |

What is a medium? | A medium is the material (solid, liquid or gas) through which a wave can travel. |

What is a transverse wave? | When particles in a medium are moving perpendicular to the direction the wave is traveling. |

What is a crest? | The place where the wave is highest. |

What is a trough? | The place where the wave is lowest. |

What is a longitudinal wave? | When particles in the medium are moving in the same direction as the wave is moving. |

What is compression? | The part of a longitudinal wave that moves together, and could be compared to the crest of a transverse wave. |

What is rarefaction? | The part of a longitudinal wave the releases, or spreads apart, and could be compared to the trough of a transverse wave. |

What is a mechanical wave? | A wave that requires a medium to travel through. |

What is an electromagnetic wave? | A wave that does not require a medium to travel through. |

What is amplitude? | The distance between particles in the medium from their rest position. The disturbance of the wave. |

What is wavelength? | The distance between any point on a wave and an identical point on the same wave. |

What is frequency? | The number of waves the pass a point in a certain amount of time, usually a second. |

What is a Hertz? | A measurement of one wavelength per second. |

What is wave speed? | The speed that the waves travel. |

What is force? | Measured in Newtons. A push or a pull excerted on an object to change its motion. |

What is work? | The use of force to move something. Measured in Joules or Newton Meters. work=force x distance |

What is power? | Having energy and using it to power yourself or something. |

Sally is walking down a hall that is 20 meters long. She applies a force of 22N. How much work did she apply while walking down the hallway? | W = F x D 22N x 20m = 440J |

Bob is getting his books from his locker. There are 8 books.The force needed for each book is: 5N, 9N, 10N, 3N, 8N, 11N, 7N, and 10N. He then carries them the 20m to science. It takes him 120 seconds total. Calculate the Power. | W = F x D 63N x 20m = 1,260J P = W / T 1,260J / 120s = 10.5W |

A wave has an amplitude of 5centimeters. From any crest to the nearest trough, it is 9 centimeters. What is the wavelength of this wave? | 9cm + 9cm = a wavelength of 18 centimeters |

What measurement is measured in Newtons? | Force is measured in Newtons. |

If you have a wavelength of 14 centimeters, how far is any crest to the nearest trough? | 14 / 2 = 7 centimeters from crest to trough/trough to crest |

What is the formula for calculating power, and what do you have to calculate before you can get your answer? What is the formula for it? | Power = Work / Time but first you have to calculate work: Work = Force x Distance |

What can be compared to a crest and a trough in a longitudinal wave? | Compression and rarefaction |

What can be compared to compression and rarefaction in a transverse wave? | Crest and Trough |

Which wave has particles in its medium that move perpendicular to the resting point? | Transverse wave |

Which wave has particles in its medium that move in the same direction as its resting point? | Longitudinal wave |

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