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# Waves,work and power

### Waves,work and power by Zane d.

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

What is work? | The use of force to move an object a distance. |

What is Force? | A push or pull exerted on a object to change the motion of the object. |

What is a Medium? | A material- solid, liquid or gas through which a wave can travel. |

What is a Wave? | The disturbance that transfers energy. |

What is a Crest? | The highest part of a wave. |

What is a trough? | The lowest part of the wave. |

What is a longitudinal wave? | A longitudinal wave makes particles move back and forth in the same direction that the wave travels. |

What is Compression? | When the wave tightens in an area, the wave makes the particles compact in a small area. |

What is Rarefaction? | The spread out particles of a longitudinal wave that usually either come after or before compression's. |

What is a Transverse wave? | Particles that move perpendicular to the direction the wave travels. |

What is a Mechanical wave? | A wave that needs a medium to transfer energy through. |

What is Amplitude? | A measure of how far particles in a medium move from there rest position. |

What is Wavelength? | The distance for any point on a wave to the next identical point on the same wave. |

What is Frequency? | The number of waves that pass a point in a given amount of time. |

What is the definition of Hertz? | Hertz is the measurement of frequency and can be used in scientific formula's as well. One hertz is also equal to one wavelength per second in a wave. |

What is Power? | the rate (energy amount per time period) at which work is done. |

A girl lifted a box of food that weight 150 N, the box is lifted at the height of 0.900 M. How much work did the girl do? | W=FD Work= (150 N)(0.900 M) Work= 135 Joules. |

A man lifts a 200 N box in the air by 2 meters in 8 seconds. What was the amount of power that was used? | "P=W/T Work=(F)(D) Work=(200 N)(2 M) Work= 400 Joules Power= 400/8 Power=50 watts. |

A boy walked 4 meters in a straight line and was carrying a box of toys that weighted 800 N. How much work did he do? | work=(F ⋅ D) work=(800 ⋅ 4) work= 3,200 Joules. |

Sally went to the grocery store. She was carrying her 300 N grocery bag while walking to her car, She walked 4 M to get to her car. How much work did she do? | w=(F ⋅ D) work=(300 ⋅ 4) work=1,200 Joules. |

If 400 Joules of work are needed to move a box 6 meters what is the weight of the box? | f=w/d force=400/6 force=66.7 newtons. |

If a girl moves a small box that weights 2 newtons and she moves it 10 meters in 15 seconds. How much power was used? | p=w/t work= (F ⋅ D) work=(2 ⋅ 10) work=20 joules power=20/15 power=1.3 watts. |

How much time is needed to produce 500 Joules of work if 20 watts of power is used? | T=w/p T=500/20 Time= 25 seconds. |

Bobby carried a box of books that was 400 M in 10 seconds. What is the wave-speed? | WS=D/T WS=(400 M ⋅ 10 seconds) WS=40 meters per second. |

What is Wave Speed? | Wave speed is determined by the waves wavelength and frequency and also depends on the properties of the medium. |

What is the formula's for power, time, work and force? | Power= Work / Time Time= Distance / Speed Work= Force ⋅ Distance And Force= Mass ⋅ Acceleration |

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