As scientists have learned more about atoms, models of atoms have changed. One of the first atomic models was a solid ball, such as a marble. What are two limitations of using a marble to model an atom?

A. the model does not move or behave like a real atom.

B. the model is not made of commonly available materials or objects.

C. the model does not show the true size of an atom.

D. the model is much harder to see than a real atom.

answer; /// i do believe that the correct answer is (c)nuclear bond

practical process described pest part of scientific investigation.

because practical knowledge is powerful then therotical knowledge.

c (diamond),

sio2 (quartz)

(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