Answer:
a) I = 5,507 10⁻⁴ W / m²
, b) P = 1.65 10⁻⁸ W / m²
, c) R = 4.06 m, I = 1,259 10⁻⁶ W / m²
Explanation:
A) the intensity is defined as the power per unit area
I = P / A
The intensity for the radius of the sphere of 85 m is
A = 4π R²
A = 4π 85²
A = 9,079 10⁴ m²
The intensity at this point is
I = 50.0 / 9.079 10⁴
I = 5,507 10⁻⁴ W / m²
b) The power collected by the microphone
We reduce the area to the SI system
a = 0.30 cm² (1 m / 10² cm)² = 0.3 10⁻⁴ m²
P = I A
P = 5,507 10-4 0.30 10-4
P = 1.65 10⁻⁸ W / m²
c) Let's reduce dβ
β = 10 log (I / I₀)
β = 10 log (5,507 10⁻⁴ / 1 10⁻¹²)
β = 59 dB
d) if the gain is 3 dB, the total intensity is
β = 59 + 3
β = 61 dB
We look for the intensity
I = I₀ 10 β / 10
I = 1 10⁻¹² 10 (61/10)
I = 1,259 10⁻⁶ W / m²
Use
A₁ I₁ = A₂ I₂
A = 4pi R2
We replace
R₁² I₁ = R₂² I₂
R₂ = R₁ √ I₁ / I₂
R = 85 RA (1,259 10⁻⁶ / 5,507 10⁻⁴)
R = 4.06 m
Because the poles have like poles and like poles reple each other
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Answer:
Displacement by cyclist is zero.
Explanation:
In the given question bicyclist is travelling in a rectangular track having P , Q and R edges.
The bicyclist starts from P and travel through Q and R and returned to P again.
We need to find its displacement.
We know displacement of a body is its difference between its initial position to final position.
Here in the given question the bicyclist returns to P again.
Therefore, total displacement by bicyclist is zero.
Hence, this is the required solution.
Answer:
Force can also be described intuitively as a push or a pull. ... It is measured in the SI unit of newtons and represented by the symbol F. The original form of Newton's second law states that the net force acting upon an object is equal to the rate at which its momentum changes with time.
Explanation:
hope this helps : )
