Mccain Blog II

This is the second part of the John Mccain blog entry.

He is the U.S. senator from Arizona, from1987 to the present. He was a U.S. representative from Arizona, from 1983 to 1987; He was the Senate Navy liaison, from 1977 to 1981. He was a U.S. Navy pilot and captain, from 1958 to 1981.

His seven children are named Doug, Andy, Sydney, Meghan, Jack, Jimmy,and Bridget. He is an Episcopalian. He was born on Aug. 29, 1936.

He supported and served on at least five legislations acts and committees that I know of, there could have been many more. The first one that I know of is that he was on a committee with John Kerry that was going to find out if there were still any POWs left in Vietnam, he worked with senator Feingold on the McCain Feingold act, he supported the cap and trade legislation for emissions control but it didn’t pass, he supported immigration reform and was on the senate Indian affairs committee.

Density of Various Materials

We completed an investigation of mass, volume, and mass density. Dad directed the experiment and explained the concepts, and C did the measurements and calculations. In addition to introducing the physical concepts, we also discussed ratios, error, and accuracy.

We measured the mass and volume of small samples of granite gravel, glass marbles, aluminum, steel, alkaline batteries, and a candle. We measured masses using a triple beam balance. We measured volume with a graduated cylinder filled with water by putting each sample in the water and measuring how high the water rose. We found the density of the materials by dividing the mass by the volume.



We don't know why blogger puts this big space here. Go figure.

Sample	mass(g)	volume(ml)	mass density(g/cc)
rock 1	13.2	5	2.64
rock 2	10.1	4	2.53
rock 3	10.0	4	2.5
marble 1	19.0	8	2.4
marble 2	5.4	2	2.7
X-acto handle 1	13.4	5	2.68
X-acto handle 2	23.7	9	2.63
socket adapter	70.6	9	7.84
bolt	38.4	5	7.68
c battery	69.5	22	3.16
aa battery	24.3	8	3.04
candle	8.5	10	.85

When making our measurements we had to use a small wad of poster goo to keep the marbles from rolling off the balance. The mass of the goo was too small to measure. We used a skewer to knock air bubbles off of the X-acto handles and shook the bolt in the graduated cylinder. We pushed the candle down into the water with the skewer because it floated.

We looked up standard values for the materials on the web. For granite and steel we found average values because those materials are mixtures. Our measured values agreed with the average values. For aluminum (the X-acto knife handles) the standard is 2.7 g/cc. For paraffin wax the density is 0.93 g/cc.

We wanted to compare our measurements with the standards for paraffin and aluminum, so we calculated the percentage of error:

% error = ((measured value - standard value)/standard value) x 100

For aluminum our percentage of error was 0.7% for the first sample and 3% for the second sample. The measurements for aluminum seemed pretty accurate. For paraffin our percentage of error was 9%. A possible source of this error might be our use of the skewer to push the candle into the water. Another possible problem might be that the candle wasn't pure paraffin.

C enjoyed this experiment, but now is very excited to run out of the room and go play with friends.