Answer: The sound intensity was reduced by -14.77 dB.
Explanation:
The level of the intensity of the sound with respect to the reference value is called Sound Intensity level.
I = Intensity of the sound
= Reference sound intensity
According to question, sound-reflecting windows that reduce the sound intensity level by 30.0 db .
Let the intensity of the sound be and reduced intensity be I.
The sound intensity was reduced by -14.77 dB.
Answer:
Explanation:
In order to find the acceleration of the block, we have to find the net force acting on it along the direction parallel to the incline.
However, there is only one force acting on the block along this direction: it is the component of the weight parallel to the plane, given by
where
m = 15 kg is the mass of the block
is the acceleration of gravity
is the angle of the incline
According to Newton's second law, the net force is proportional to the acceleration, a:
So we can write:
And so, the acceleration is:
Answer:
Average velocity will be 58.181 m/sec
Explanation:
Distance between station A and station B = 1188 meters
As the train starts from station A its initial velocity u = 0 m/sec
Final velocity is when it reaches at station B is 20 m/sec
Acceleration
From first equation of motion
20 = 0+2.41×t
t = 8.298 sec
Now from station train began to deaccelerate and finaly stop so final velocity v = 0 m /sec
Initial velocity u = 20 m/sec
We know that v = u+at
Deacceleration
So 0 =20 -1.65×t
t = 12.12 sec
So total time = 8.298 + 12.12 = 20.419 sec
So average velocity
So average velocity will be 58.181 m/sec