部落格

This week was an especially stressful week. Why did all(most) of my teachers all schedule a test this week? Explains why I stay up late at nights. Yesterday, when I was doing my physics, I collapsed on the bed to find my Hamtaro staring at me.

That gave me quite the scare. <*0*<

There is a fan in my room. And it keeps me cool as I close all the windows, doors, and curtains. The fan has a speed of 102 revolutions per minute and a radius of 0.39 m. Therefore, according to physics:

T=2pir/v

1.7 s=2pi(o.39 m)v

v=1.44 m/s

That's the velocity for the edge of the fan blades. Also:

Ac=v^2/r

=(1.44 m/s)^2/0.39m

=5.32 m/s^2

That's the centripetal acceleration of the edge of the fan and it always points toward the center. I would want to calculate the centripetal force, but my parents would not let me take the fan off the ceiling and mass it. Here's a video of the fan starting up. It has not reached its maximum velocity yet during this video, so don't doubt my counting skills.

Let's hope we have all seen a fan before...

My Saturday

So today, we played cards.


























GO DUSTIN! щ(ﾟДﾟщ)

...Yeah, that's it. （ ´,_ゝ`)

Don't Forget the Padding!

I remember seeing a huge hole in one of the cellos (or was it double bass?) in the music library over the summer. That person was probably not very careful. But, if that cello was in a case, it could have been saved from a grievous injury (and then sent over to the Music Center of Hawaii for repairs which cost the school a whole bunch of money). So, this cello case. It's very comfy. I remember Sumil sleeping on a whole pile of them and Cole doing things off to the side... Ahem. So the cello case is padded, and this padding will wrap around the cello when it is dropped, increasing the time of the collision on the cello, thereby reducing the force and the chance of a crack. However, if the momentum is too much, the cello will crack anyway because the padding will not be able to cushion the fall enough. This is because the cello was built to withstand a maximum impulse. If either the momentum is too large or the time too small, the cello will crack, making Mrs. Hafner very angry. The styrofoam thingies that people put when packaging teacups have the same principle (minus the Hafinator). Tea is good...

The violin, on the other hand, will crack anyway. But trumpets will never crack, just dent. :P

So what does Doc chew from that cup of his? Many things could be possible- ice, popcorn kernels, mochi crunch, bean pops, etc. Hmmm...