An arson investigator is called to a suspicious fire that destroyed a house. The arson investigator collects a sample of debris, which was found at the base of the structure, containing some accelerant used to start the fire. Once the investigator goes back to the lab and tests the sample, a purple flame is emitted from the sample. What metal was part of the accelerant used to burn the house?

in the analysis of systems that involve fluid flow, we frequently encounter the combination of properties u and pv.

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied