Sound intensity is inversely proportional to the square of the distance between the source and the receiver.
That is
I = k/r^2
where
k = constant
r = radius
When r=1, the intensity is I₁ = k/1 = k
When r=3, the intensity I₂ = k/3² = k/9
Therefore
I₂ = I₁ /9
In decibels,
I = 10 log₁₀(I/I₀)
where I₀ = reference intensity
When r=1,
10 log₁₀ (I₁/I₀) = 270
When r =3,
10 log₁₀ (I₂/I₀) = 10 log₁₀ [(I₂/I₁)*(I₁/I₀)]
= 10 log₁₀ [(1/9)*(I₁/I₀)]
= 10 log₁₀(1/9) + 270
= 260.5
Answer: 260.5 dB (nearest tenth)
Answer:
Explanation:
His displacement is 0 because he ended up exactly where he started.
Answer:
C
Explanation:
gravity is a pulling force according to Newton
I think it is c I'm only in 7th grade but I'm pretty sure that the answer is c
Answer:
0.421 cm
Explanation:
Volume of a cylinder is:
V = πr²h
where r is the radius and h is the height or length.
Given V = 1.932 cm³ and h = 3.47 cm:
1.932 = πr² (3.47)
0.557 = πr²
r² = 0.177
r = 0.421
The radius is 0.421 cm.
