The year is 3691. a suburbanite family visits a historical museum where they admire an exhibit on 20th century cooking. in one of the cases lies a can of spam produced in 1996. assuming complete homogeneity of the meat product's nuclei (and yes, we are assuming it's how many nuclei are still present if the half-life of the nuclei is 236 years and the can contained 5.0×108 nuclei of spam when it was produced?

N = No(2^-t/t1/2) (t1/2 = half life )

N = 5x10^8(2^-(3691-1996)/236)

N = 5x10^8(2^-7.182)

N = 3.44x10^6 nuclei

the answer is; comparing the frequency of collisions with and without the device

this makes the anti-collision system an independent variable and the collisions a dependent variable. if there are fewer collisions with an anti-collision system that without, then it can be stated that the system is a success. essentially, collisions under an anti-collision system are compared with the frequency of collisions by cars with the human drivers.