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If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

During a steady flow process, the change of energy with respect to time is zero. a)- true b)- false

The higher the astm grain-size number, the coarser the grain is. a)-true b)-false