Slide 1

F = ma = (90.0 kg)(9.93 m/s2) = 894 N

a = v/t = (44.7 m/s - 0 m/s)/4.5s

KE = 1/2mv2

v = 2(KE)/m = 2(50J)/1kg = 10 m/s

momentum (p) = mass * velocity so p is directly proportional to v which means that the higher your velocity, the higher your momentum.

Work = force*distance = (12,054N)(1.89m) = 22782.06 J

Power = Work/time = 22782.06J/4.75s =

Action-Reaction pairs are TWO things reacting against each other. Go through the following scenarios and identify the pairs.

AGround - Rocket - Exhaust Gases (3 objects)BExhaust Gases - Air - Rocket(3 objects)CRocket - Exhaust Gases (2 objects)DGravity - Rocket Exhaust - Friction (3 objects)

We want a short resistance arm.

Compression waves are most seen in longitudinal waves. Think of a slinky. The compressions are where the coils are close together. B is the only longitudinal wave option.

Resonance is the phenomenon that occurs when the natural frequency of a material is reached by an external frequency producing object.

Potential energy = mass*gravity*height

PE1 = 2kg * 9.8m/s2 * 3m = 58.8JPE2 = 2kg * 9.8 m/s2 * 1m = 19.6J

Difference between the two = 58.8J - 19.6J =