When one person was talking in a small room, the sound intensity level was 60 dB everywhere within the room. Then, there were 14
people talking in similar manner simultaneously in the room, what was the resulting sound intensity level?
A. 64 dB
B. 60 dB
C. 69 dB
D. 79 dB
E. 71 dB
A. 64 dB
B. 60 dB
C. 69 dB
D. 79 dB
E. 71 dB
1 answer:
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We know that
• The mass of the elevator is 5000 kg.
Let's draw a free-body diagram.
As you can observe, there are just two forces involved, the weight of the elevator and the tension force. Let's use Newton's Second Law.
But, W = mg = 5000kg*9.8m/s^2 = 49,000 N, and m = 5000 kg, a = 0 (because the speed is constant).
