Ellen performed the experiment on the density of a gas using two half tablets of Alka-Seltzer, she found a density of 1.8x10 g/cm? Ned performed the same experiment using four half tablets of Alka-Seltzer and a larger collecting bottle. If
neither student made any errors, what should Ned find for the density of the gas, in g/cm3?

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.