[this is school]

Today Emma M., Honore, and I all did the Impact Craters lab. We had to drop a golf ball from 5 different heights (we did 6) and measured the depth and width of the craters. We found that 4.5 (for the width) and 2 (for the depth) centimeters was constant in all but a few where 1 (for the depth) and 3.5 (for the width) centimeters was constant. Next, we had to calculate the GPE. The way we have to calculate the GPE is GPE=MGH we had the G and the H but we needed the M to be able to find the GPE. So, we took the golf ball to the scale and found that it weighed 45.8 grams. We know that mass is measured in kilograms so we needed to divide 45.8 by 1000. 45.8/100=.0458. Using this, we calculated the GPE of each of the heights. These were the calculations: from 36inch=.41J. 30inch=.34J. 24inch=.27J. 18inch=.21J 12inch=.12J 6inch=.07J. Next we had to calculate the velocity by using GPE=KE when KE=1/2(M) (V)2. For these calculations we got the velocity for: 36inch=.62m/s 30inch=.6m/s 24inch=.5m/s 18inch=.4m/s 12inch=.3m/s 6inch=.2m/s.
Thats all for today!

Labels: M2M

Today Hannah, Sam and I did the Body Power Lab... We had to calculate our Basal Energy Expenditure (BEE).. My BEE is 6,624,378.3 . Next we had to calculate our Resting Heart Rate (RHR).. mine is 120. My maximum heart rate (MHR) is 87. Next we were supposed to calculate our Working Heart Rate (WHR) but we didn't quite get to that... the only person who calculated hers was Sam. Heres the equations we had to use:

BEE= 65.5+9.6M+1.7H-4.7A
A= age
M= mass in kg
H= height in cm

RHR is calculated by counting your heart beats for one minute.

MHR= 22-age-RHR

and that's as far as we got!! that's it for now! I was surprised how many heat beats I had in a minute when I was at rest... and how many calories i needed: 6,624,378.3!!

today I did the lab, the power of sound. Clara, Gemma and I used Logger Pro to track magnetic currents. We first just held a nail above the sensor.. and it picked up a signal and we recorded it.. second time, we wrapped a wire around the nail 3 times and recorded the signal data. the wire was attached to a flash light battery.. We did the same process each time, for wire wraps 6,9,12,15,21... When we looked at the data as a whole, we saw that the current actually had decreased.. but the current was supposed to increase. I think the problem was that it was hard to record the current because it wasn't steady.. it would go from 270, to 120 in a second.. so some of the data was rather inaccurate in that case.. I learned that even a nail without anything attached to it contains electricity. and that the more wire/metal, the more electricity..

Labels: M2M

Today, Anja, Cece, and I did the heat shields lab. We had a wooden dowel that had a nail glued onto it and we had to make a heat shield to keep the glue from melting for as long as possible. We were given a piece of wire netting, a large piece of aluminum foil, a washer, and a bolt. My design was in this order, stacked from closest to glue, to farthest from glue: wire netting, washer, aluminum foil, bolt.. and a small piece of aluminum to cover the tip of the screw. The other thing I did was designed it so the wire netting made a sort of a dome shape, and the aluminum on top made a bowl shape.. it looked like this: )( )=netting and (=foil I thought the aluminum could then reflect the heat and protect the metal for longer, while the under lair curved the opposite way to act like a dome, and also allow the heat that made it through the aluminum to spread out and not give direct heat to the glue. I was only to test my shield once, but it was able to last for approximately 18 seconds... I was surprised how quickly the heat traveled through the aluminum and how hard it was to make an effective shield. I was also surprised by how many different ways you could make the shield and how many different varieties and combinations there were.

Labels: M2M