Which example of observations would provide a scientist with the best data for planning a new investigation about plant growth?
A: The scientist observed that, after exactly four weeks, the lima bean plant labeled "C" in soil was 3.25
inches taller than the other plants.
B: The scientist observed that after exactly four weeks, the bean plant in the darker soil was about 3
inches taller than the other plants.
C: The scientist observed that after about a month, the green plant in some soil looked taller than the
rest of the plants.
D: The scientist observed that after about 30 days, the bean plant labeled "C" in the soil was a couple of
inches taller than most of the other plants.
HEL

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

(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