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Article posted May 8, 2013 at 04:34 PM GMT0 •
comment • Reads 41
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Eggs. After the female lays her eggs in a redd, she dies. Leaving the eggs to dangers that can damage and hurt the eggs and redd like animals, loggers, hikers, and horse back riders.
Even if the eggs won't get hurt, they need things that can help them survive, like cool water(to warm, and they can die), and the redd, which brings nutrients for the eggs
The eggs that are laid in the fall are hatched in the spring and become alevin. About one inch long, they still have a yolk sac. It contains protein, minerals, sugar and vitamins. They feed off the yolk sac for a month or so until they emerge from the redd and become fry. Alevin that leave the gravel before the yolk sac is completely absorbed are called button-up fry.
Animals like gulls, dippers, sculpins and trout all feed upon salmon eggs and young alevin.
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Article posted May 8, 2013 at 04:34 PM GMT0 •
comment • Reads 41
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Article posted April 19, 2013 at 04:26 PM GMT0 •
comment • Reads 46
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Article posted April 19, 2013 at 04:26 PM GMT0 •
comment • Reads 46
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Article posted February 19, 2013 at 04:30 PM GMT0 •
comment • Reads 319
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1. The effort force, the effort distance, and the work grew the closer you get to the fulcrum.
2. Simple machines make life easier, like the lever and the pulley.Both help people lift hevier objects.
3. My team's lever didn't work, but one teams did. They first moved their motor near the bottom.It worked at first, but it couldn't lift 10 washers 10 centimeters, so they took washers off one by one, and they managed to lift 5 washers.
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Article posted February 19, 2013 at 04:30 PM GMT0 •
comment • Reads 319
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Article posted February 1, 2013 at 04:35 PM GMT0 •
comment • Reads 65
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Article posted February 1, 2013 at 04:35 PM GMT0 •
comment • Reads 65
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EMM Lesson 10
Article posted January 22, 2013 at 04:31 PM GMT0 •
comment • Reads 311
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1.The light bulb lite up.
2.The light bulb gets dimmer when there's 4 washers and lighter with 7 washers
3.(summery of the table)4 washers were very bright, 5 washers dim,6 washers brighter but not that bright and 7 washers was blinking on and off and dim
4.the more washers, the less the light bulb lights up.
5.the energy came from the gravity when it pulled the washers down
6.the work the washers did was for 4 was1.65 n-m,5 washers was 2.25n-m,6 washers 2.55 n-m, and 7 washers was 3 n-m.
7.the more washers on the string, the more work it does.
8. The distance and the number of washers could affect the brightening the light bulb.
9. Step 1:gather your materials
Step 2: set up your peg board.
Step3:
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Article posted January 22, 2013 at 04:31 PM GMT0 •
comment • Reads 311
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lesson 9
Article posted January 10, 2013 at 04:15 PM GMT0 •
comment • Reads 341
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1.A watt is a common unit of power.To calculate watts,you need to devide work by time.
2.the 100-W lightbulb uses 100-Nm.
3.One horsepower(another unit of power)equals to 750 watts.
4.Yes because with three batteries,the motor lifted the washers faster
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Article posted January 10, 2013 at 04:15 PM GMT0 •
comment • Reads 341
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Article posted December 21, 2012 at 04:28 PM GMT0 •
comment • Reads 320
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The scientifict definition of work is when its done on a object,but when we use the word work, we refer it to the effort it takes to get something done.there's a big difference.The daily definition of work means labor,while the scientific definition of work means to move something, like when a motor is lifting 6 washers.
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Article posted December 21, 2012 at 04:28 PM GMT0 •
comment • Reads 320
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Article posted December 13, 2012 at 04:29 PM GMT0 •
comment (1) • Reads 720
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When I put the washers on the pulley,the pulley lifted more washers than the pulley.
My hypothesis was that the pulley would lift more washers because the pulley would have more space and a lot more power.I was right.2 data points of mine was that one,the nail lifted only 4 washers while the pulley lifted 5 washers.
the best configuration was 3 batteries, series configuration, short string, pulley(for me, at least)but nail for everyone else,and three wires.the motors can lift 7 washers and the motor can generate 2.25 newtons.
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Article posted December 13, 2012 at 04:29 PM GMT0 •
comment (1) • Reads 720
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Article posted November 29, 2012 at 04:35 PM GMT0 •
comment • Reads 650
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1.Controlled variables can't be changed.
2.When you pull the block across the surface,friction slows the block down, and then the spring scale, it measures the friction.
3.the friction force would be 0.0.two blocks would still be o.o and three blocks would still be 0.0.
4.My conclusion was that when I put put each blocks on the coarse sandpaper,the friction force increased.my hypothesis was that the weight of the blocks would increase the friction force.my hypothesis was correct.
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Article posted November 29, 2012 at 04:35 PM GMT0 •
comment • Reads 650
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Article posted November 8, 2012 at 04:35 PM GMT0 •
comment • Reads 371
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1.I would make a little sling shot, put the cart in the sling shot, then fling it across the room.
2.I would tie the rubber band with another one,then pulling them to the maximum force.
3.The force that make objects have weight is called Gravity.
4.the direction that Gravity pulls the washers is down.
5.Because every thing has different mass,so the weight would be different.
6.Strength or energy as an attribute of physical action or movement.
7.When I put more washers, the weight increased.I predicted
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Article posted November 8, 2012 at 04:35 PM GMT0 •
comment • Reads 371
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