A cube has sides of length 10 cm and weighs 10 N. Calculate the pressure when it rests on one side N/cm2

P = r g h   where r here is the density m / V and then P is the pressre.

W (weight) = m g

m = 10 N / 9.8 m / s^2 = 1.02 kg

r (density) = m / V = 1.02 kg / 1000 cm^3 = .00102 kg/cm^3

P = .00102 kg / cm3 * 9.8 m/s^2 * 10 cm

P = .1 kg m / (s^2 cm^2)

Since 1  N = kg m / s^2    then P = .1 N / cm^2

More simply P = F / A = 10 N / 100 cm^2 = .1 N / cm^2

graph slopes whilst gas cools, then it is flat whilst conensation to liquid happens, the coolong liquid then graphs as a slope when it solidifies graph is flat

latent heat

firearm identification is the process of analyzing the bullets and cartridge cases left at a crime scene to determine if they came from a particular firearm. marks on the bullets and cartridges may be common to every firearm of that type. these are called class characteristics.