Question

During a blackout, you are trapped in a tall building. You want to call rescuers on your cell phone, but you can't remember which floor you're on. You pry open the doors to the elevator shaft, drop your keys down the shaft, and hear them hit bottom at ground level 3.27 s later. Assume that the height of one floor is 3.0 m.

1.Making a simple calculation and remembering that the ground floor is numbered floor 1, you determine which floor you're on. What floor is that?

2.Before you make the phone call, however, you realize you've forgotten that the sound of the impact at the bottom travels up the shaft at 340 m/s, and so you redo your calculation. What floor number do you tell the rescuers?

Answer 1