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3 years ago

Understanding that if we say something unkind to someone else his or her

Physics

1 answer:

OlgaM077 [116]3 years ago

6 0

Answer: Moral

Explanation:

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A radar for tracking aircraft broadcasts a 12 GHz microwave beam from a 2.0-m-diameter circular radar antenna. From a wave persp

NISA [10]

A) 750 m

First of all, let's find the wavelength of the microwave. We have

$f=12GHz=12\cdot 10^9 Hz$ is the frequency

$c=3.0\cdot 10^8 m/s$ is the speed of light

So the wavelength of the beam is

$\lambda=\frac{c}{f}=\frac{3\cdot 10^8 m/s}{12\cdot 10^9 Hz}=0.025 m$

Now we can use the formula of the single-slit diffraction to find the radius of aperture of the beam:

$y=\frac{m\lambda D}{a}$

where

m = 1 since we are interested only in the central fringe

D = 30 km = 30,000 m

a = 2.0 m is the aperture of the antenna (which corresponds to the width of the slit)

Substituting, we find

$y=\frac{(1)(0.025 m)(30000 m)}{2.0 m}=375 m$

and so, the diameter is

$d=2y = 750 m$

B) 0.23 W/m^2

First we calculate the area of the surface of the microwave at a distance of 30 km. Since the diameter of the circle is 750 m, the radius is

$r=\frac{750 m}{2}=375 m$

So the area is

$A=\pi r^2 = \pi (375 m)^2=4.42\cdot 10^5 m^2$

And since the power is

$P=100 kW = 1\cdot 10^5 W$

The average intensity is

$I=\frac{P}{A}=\frac{1\cdot 10^5 W}{4.42\cdot 10^5 m^2}=0.23 W/m^2$

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3 years ago

Assume that the blocks are accelerating, and the x components of their accelerations at a certain moment are a1x and a2x. find t

Serga [27]

we know that center of mass is given as

r = (m₁ $r_{1x}$ + m₂ $r_{2x}$ )/(m₁ + m₂)

taking derivative both side relative to "t"

dr/dt = (m₁ d $r_{1x}$ /dt + m₂ d $r_{2x}$ /dt)/(m₁ + m₂)

v = (m₁ $v_{1x}$ + m₂ $v_{2x}$ )/(m₁ + m₂)

taking derivative again relative to "t" both side

dv/dt = (m₁ d $v_{1x}$ /dt + m₂ d $v_{2x}$ /dt)/(m₁ + m₂)

a= (m₁ $a_{1x}$ + m₂ $a_{2x}$ )/(m₁ + m₂)

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3 years ago

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Best exercises for these topics. <br> (have the amount of exercises, have 4 exercises for each.)

Kipish [7]

Answer:

what is the question?

Explanation:

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2 years ago

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During a total lunar eclipse, where is the Moon located?

krok68 [10]

During a total lunar eclipse, the Moon located in the umbra. The answer is letter A. For a total lunar eclipse to occur, the Sun, Earth and Moon must be aligned in a straight line. The Earth’s umbra complete covers the Moon. The earth’s umbra is about 870,000 miles wide.

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3 years ago

37. Which of the following is not used in cal-

Masja [62]

Answer:

Explanation:

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