No im not talking about a fish... have you ever heard that pulsing through you when you listen to music? that's because the bass is good. Speakers use electromagnets that create magnetic field allowing current to flow through. These electromagnets are attatched to the speaker through which the sound pulses travel to you. The pitch you hear depends on the frequency of vibrations while the volume depends on amplitude of the sound waves.
After being sick for two weeks, i've watched a lot of television. One movie that came on while I was lounging around was Ice Age. I never thought I could relate physics to a cartoon, but then I wondered how these dumb animals like the sloth, Sid knew which way his family had migrated. How do animals know which way is north and south? After a little research i found out it's the magnetite (lodestone) in animals bodies that detects Earth's magnetic fields. Since Earth's geographic south is magnetic north, the animals will know which way to travel based on a feeling of pull on their lodestone. This magnetite in animals is like a built in compass. It would be bad if Earth's magnetic fields altered, changed direction over time, because then packs of animals would travel in the wrong direction and face extinction.
This weekend, a bunch of girls were getting ready at my friend's house for a party. You know how girls are getting ready. We have the washing machine, blowdryer, flat irons, the whole fiasco plugged in and running. Although technology sets up appliances to be in parallel circuits allowing each to be used at one time, when you have too many things turned on at once, the circuit will blowout. This happened this weekend because there was too much ampage being drawn through the circuit. My friend's mom had to flip the circuit breaker to fix the problem. Circuit breakers are switches that will open if the current is too hight; they can then be reset, but you have to unplug something. You can't have that much turned on again or the circuit will will blow out AGAIN.
When I lived in Europe, there was a significant voltage difference in the electrical outlets. Appliances I have from there won't work in America without an adapater and vice versa.Haha sooo before I moved here I used to be a cheerleader...this is a pretty bad video but the only one I could find. In the stunt on the right I do a full down. Similar to what ice skaters do when they do jumps and spins, I bring my arms in to spin. You have to throw your arms down with enough force and speed to make at least one revolution before landing.
Before I'm thrown in the air when my arms are extended, I have a larger Inertia then when they're close to my body. According to conservation of angular momentum, my inital inertia x intital angular velocity must equal final inertia and angular velocity. Since bringing my arms in decreases inertia, making it easier for my body to spin, there must be an increase in angular velocity to compensate.
Alright so ceiling fans arent that popular anymore. My house doesnt have any so I got excited when there was one in my hotel room d: It also reminded me of our lab on centripetal acceleration and the skydancer toy. The toys wings started at its side and flew up. The only difference now is that the fan's planks are all already in the same plane rotating about the light in the middle. When i pulled the string the began to spin faster increasing angular velocity. They continue to spin because of Newton's First Law of Motion: and object in motion wants to stay in motion unless acted upon by an outside force. If one of the planks joint was to break it would fly off in a straight line tangent to the circular motion.
