CHEM
35
Introductory
Chemistry
September 8, 2000
Name:
Anne Serkey
Some possibly useful conversions: 1 mile = 5280 feet
1 inch = 2.54 cm
meters -> cm -> inches -> feet
-> miles
1500
m x 100 cm x 1 inch x 1 foot x 1 mile = 0.932056789 mi
1
m
2.54 cm 12 in 5280 ft
Round: Assuming 1500-m event is
measured to the nearest meter, we’re limited to 4 sig figs in our answer
0.932056789
mi -> 0.9321 miles
Dalton had evidence to support his theory (which was based on many carefully controlled experiments). Democritus’s suggestion was only based on his “thought experiment” and so had no REAL evidence in support of this.
Electromagnetic forces are based on the magnitude of charge, whereas gravitational forces vary with the magnitude of mass. Atoms and molecules have very tiny masses but very significant charges, so electromagnetic forces are large and gravitational forces tiny. Planets and starts are just the opposite: HUGE masses, but very little charge.