A student prepared this table to gather information about digestion. Digestion of Food Column A Column B Physical Changes Chemical Changes The results of which investigation would be entered in Column A of the table? A. How do mitochondria release the energy in food molecules? B. Which type of teeth are most important in crushing food? C. What chemicals in the stomach are most important in breaking down proteins? D How do substances released by the pancreas affect the rate of digestion?

B. Which type of teeth are most important in crushing food?

Explanation:

According to the question physical changes ought to be entered into column A while chemical changes ought to be entered into column B.

The crushing of food is a physical change. It does not involve any chemical transformation of the food material.The other options involve some sort of chemical transformation taking place on the food material being digested.

(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