Current atomic models show an atom's nucleus surrounded by electron clouds. an electron cloud is a region around an atom's nucleus where an electron is likely to be. which of the following is a limitation of current atomic models?

a. scientists cannot determine whether electron clouds are two-dimensional or three-dimensional using current atomic models.

b. scientists cannot determine the number of electrons moving in an electron cloud using current atomic models

c. scientist cannot predict the exact path of an electron within an electron cloud using current atomic models.

(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