ch16 - Chapter 16 Problems 1 CHAPTER 16 WAVES AND SOUND _ _...

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Chapter 16 Problems 1 CHAPTER 16 WAVES AND SOUND _____________________________________________________________________________ _ 51. REASONING We must determine the time t for the warning to travel the vertical distance h = 10.0 m from the prankster to the ears of the man when he is just under the window. The desired distance above the man's ears is the distance that the balloon would travel in this time and can be found with the aid of the equations of kinematics. SOLUTION Since sound travels with constant speed v s , the distance h and the time t are related by h = v s t . Therefore, the time t required for the warning to reach the ground is t = h v s = 10.0 m 343 m/s = 0.0292 s We now proceed to find the distance that the balloon travels in this time. To this end, we must find the balloon's final speed v y , after falling from rest for 10.0 m. Since the balloon is dropped from rest, we use Equation 3.6 b ( 2 2 0 2 y y y v v a y = + ) with v 0 y = 0 m/s: ( 29 2 2 2 0 2 0 m/s +2(9.80 m/s )(10.0 m)
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ch16 - Chapter 16 Problems 1 CHAPTER 16 WAVES AND SOUND _ _...

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