If two firecrackers produce a sound level of 81 dBdB when fired simultaneously at a certain place, what will be the sound level
1 answer:
You might be interested in
Explanation:
It is known that wave intensity is the power to area ratio.
Mathematically, I =
As it is given that power is 28.0 W and area is .
Therefore, sound intensity will be calculated as follows.
I =
=
=
or, =
Thus, we can conclude that sound intensity at the position of the microphone is .
Answer:
The average net force on the truck is 375 Newtons.
Explanation:
Using Newton's 3rd equation of motion, we have :
×a×s
where, v = final velocity = 25 m/s
u = initial velocity = 20 m/s
a = acceleration
s = distance traveled = 300 m
Using these values in the above equation, we get acceleration = 0.375 m/
Using Newton's second law, we have:
F=m×a
where m = mass = 1000 kg
a= acceleration = 0.375 m/
Putting values we have F=375 N