3. F = ma = (90.0 kg)(9.93 m/s2) = 894 N a = v/t = (44.7 m/s - 0 m/s)/4.5s
4. KE = 1/2mv2 v = √ 2(KE)/m = √ 2(50J)/1kg = 10 m/s
5. momentum (p) = mass * velocity so p is directly proportional to v which means that the higher your velocity, the higher your momentum.
6. Work = force*distance = (12,054N)(1.89m) = 22782.06 J Power = Work/time = 22782.06J/4.75s =
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9. Action-Reaction pairs are TWO things reacting against each other. Go through the following scenarios and identify the pairs. A Ground - Rocket - Exhaust Gases (3 objects) B Exhaust Gases - Air - Rocket (3 objects) C Rocket - Exhaust Gases (2 objects) D Gravity - Rocket Exhaust - Friction (3 objects)
13. 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.
14. Resonance is the phenomenon that occurs when the natural frequency of a material is reached by an external frequency producing object.
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17. Potential energy = mass*gravity*height PE1 = 2kg * 9.8m/s2 * 3m = 58.8J PE2 = 2kg * 9.8 m/s2 * 1m = 19.6J Difference between the two = 58.8J - 19.6J =
