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# Waves,work and power

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

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
Created by: 320250