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Llana [10]
3 years ago
13

An airplane is flying at a constant speed in a positive direction. It slows down when it approaches the airport where it's going

to land. Which term describes the slowing of the plane?
1.stationary positive velocity
2.positive acceleration
3.negative acceleration
4.constant velocity
Physics
1 answer:
KatRina [158]3 years ago
5 0
3.negative acceleration....
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At some instant and location, the electric field associated with an electromagnetic wave in vacuum has the strength 57.5 V/m. Fi
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Answer:

1.9167\times 10^{-7}\ T

2.9247498849\times 10^{-8}\ J/m^3

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Explanation:

\epsilon_0 = Permittivity of free space = 8.85\times 10^{-12}\ F/m

\mu_0 = Vacuum permeability = 4\pi \times 10^{-7}\ H/m

E = Electric field = 57.5 V/m

c = Speed of light = 3\times 10^8\ m/s

Magnetic field is given by

B=\dfrac{E}{c}\\\Rightarrow B=\dfrac{57.5}{3\times 10^8}\\\Rightarrow B=1.9167\times 10^{-7}\ T

The magnetic field strength is 1.9167\times 10^{-7}\ T

Energy density is given by

u=\dfrac{1}{2}\epsilon_0E^2+\dfrac{1}{2\mu_0}B^2\\\Rightarrow u=\dfrac{1}{2}\times 8.85\times 10^{-12}\times 57.5^2+\dfrac{1}{2\times 4\pi \times 10^{-7}}(1.9167\times 10^{-7})^2\\\Rightarrow u=2.9247498849\times 10^{-8}\ J/m^3

The energy density is 2.9247498849\times 10^{-8}\ J/m^3

Power flow per unit area is given by

\dfrac{P}{A}=uc\\\Rightarrow \dfrac{P}{A}=2.9247498849\times 10^{-8}\times 3\times 10^8\\\Rightarrow \dfrac{P}{A}=8.7742496547\ W/m^2

Power flow per unit area is 8.7742496547\ W/m^2

7 0
3 years ago
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