Exercise 9 | Chemistry and the Scientific Method

Name: Exercise 9 | Chemistry and the Scientific Method
Creator: Chemistry Coach
License: https://chemistry.coach/general-chemistry-1

Chapter 1 - Chemistry and the Scientific Method

Calculate the kinetic energy of sprinter (85.2 kg) moving at 38.0 km.h^-1.

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Solution

E_k = $\frac{1}{2}$ mv² with v = speed in m.s^-1

38 km.h^-1 = $\frac{38 km}{1 hour}$ x $\frac{1000 m}{1 km}$ x $\frac{1 hour}{3600 s}$ = 10.6 m.s^-1

E_k = $\frac{1}{2}$ x 85.2 x 10.6² = 4.79 x 10³ J