Answer:
8.9 seconds
Explanation:
The height of the object at time t is:
y = h + vt − 4.9t²
where h is the initial height, and v is the initial velocity.
Given h = 30 and v = 40:
y = 30 + 40t − 4.9t²
When y = 0:
0 = 30 + 40t − 4.9t²
4.9t² − 40t − 30 = 0
Solving with quadratic formula:
t = [ -(-40) ± √((-40)² − 4(4.9)(-30)) ] / 2(4.9)
t = [ 40 ± √(1600 + 588) ] / 9.8
t = 8.9
It takes 8.9 seconds for the object to land.
Answer:
In dB intensity will be equal to 159.74 dB
Explanation:
We have given intensity of sound produced by one singer is 76.7 dB
Sound intensity is calculated as
Now it is given that 41 singers are singing in chorus
So total intensity =
Now in dB intensity will be
Answer:
The ozone layer is present in the stratosphere.
MA = (Effort Distance)/(Effort Resistance) = L/H
L = MA * H = 5 * 8" = 40"