3/9/19 Finding force using pulley system

[cheertsang]

(Bottle weight empty = 114.7 g) Plate opens 1 = 1303.6 g (only water and weight content in the bottle) (the plate was opened for a long time) Water level in head tank kept at overflow pipe height (16.7 cm from bottom of the tank) Plate opens 2 = 1261.5 g Plate opens 3 = 1277.9 g Plate opens 4 = 1262.5 g Plate opens 5 = 1254.2 g Plate opens 6 = 1269.4 g

Filling the water bottle until the plate opens, and then transfer the water in the bottle to another empty beaker until the plate closes Empty bottle weighs 116.2 g Empty beaker weighs 71.12 g Plate opens | Plate closes

Mass of contents in bottle: 743.2 g Mass of contents in beaker: 639.5 - 71.12 g = 568.38 g Plate open content: 568.38 g + 743.2 = 1311.58 g

Mass of plate + rod + hook = 105.9 g

[cheertsang]

plan 3/11

• [x] calibrate pressure sensors
• [x] rerun tests
• [x] figure out ideal gas law

[cheertsang]

The force of water is 12.46 newton The force of water is 12.62 newton The force of water is 12.47 newton The force of water is 12.39 newton The force of water is 12.53 newton

[cheertsang]

redo pulley weight experiments add water until plate opens = Minimum force to open plate

bottle mass: 59.8 g contents of bottle + bottle mass: 1) 1309.7 g * 2) 1260 g 3) 1320.7 g

changed scale because readings were all over the place bottle mass: 115.9 g contents of bottle + bottle mass: 1) 1340.4 g 2) 1353.7 g 3) 1355.3 g 4) 1346.1 g 5) 1362.0 g

Force to close valve after it has been opened mass of container: 81.1 g minimum force to close valve - measured mass as soon as valve was able to open (started opening/closing by itself) first, find force to open valve as before: 1) 1309.5 g (valve opens), 755.0 g (valve cycles) 2) 1314.5 g (valve opens), 760.2 g (valve cycles), 323.4 g (valve stays closed) 3) 1254.7 g, 741.8 g, 407.8 g 4) 1242.8 g, 676.6 g, 138.2 g 5) plate came loose

I think the important force to look at is the point when the valve cycles Should we have pressurized air chamber before? (I think it doesn't matter?)

[cheertsang]

mass of container: 80.8 g

1. 1276.3 g (valve opens), 766 g (valve cycles), 417.9 g (valve stays closed)
2. 1236.3 g (valve opens), 707.1 g (valve cycles), 361.3 g (valve stays closed)
3. 1308.5 g, 694.8 g, 169.6 g (plate came loose again)

[cheertsang]

Plate Open: The force of water is 13.24 newton The force of water is 13.37 newton The force of water is 13.37 newton The force of water is 13.3 newton The force of water is 13.45 newton

Plate Closes: The minimum force to close the valve is 4.399 newton The minimum force to close the valve is 4.397 newton The minimum force to close the valve is 3.991 newton The minimum force to close the valve is 3.966 newton The minimum force to close the valve is 4.151 newton