Tuesday, March 17, 2009
ELECTRiCAL METER
So I was searching around my house for the meter. It was on the side of the house! I never knew that those guys come by once a month to read the meters. Its kind of creepy actually when you think about it because you have total strangers in your yard without your permission. I also wonder how they would get back there because the two gates going to our yard are locked all the time. We also have two dogs back there that would go crazy.
BALLOON
When I rub the balloon against my hair, the balloon becomes negatively charged on the side that was in contact with my hair. Water is a polar molecule, meaning that it has a negative side and a positive side. The oxygen side becomes more negative and the hydrogen becomes more positive. When the negatively charged balloon is brought near the stream of water, it deflects the negative side of the water molecules. These molecules are repelled causing the stream to deflect away from the balloon. The water also looks like it is attracted to the balloon at times and this is because the positive side of the water molecule is becoming attracted to the negative balloon. Opposites attract and likes repel.
Tuesday, March 10, 2009
Rubik's Cube
So basically I have a rubik's cube at home and I do it every once in a while whenever I get bored or thinking about homework. When I was doing it I realized that physics was involved! Each of the side stuff rotates around the middle of the rubik's cube. That's why the very middle square on each side never changes, but each block around it can change. I was applying a torque in order to rotate the side I want to rotate. Torque is force multiplied with the lever arm.
The first time I got the rubik's cube, I thought it was impossible and I'd never be able to finish it. But it turned out to be really simple when I thought about it. The real trick is knowing where each piece goes because each cube has a specific place to go and just because you complete one face doesn't mean that its the correct way. Now I can finish it really easy. My best time was like little over 2 minutes (:
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