1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Gnesinka [82]
3 years ago
5

An AM radio transmitter broadcasts 63.2 kW of power uniformly in all directions. (a) Assuming all of the radio waves that strike

the ground are completely absorbed, and that there is no absorption by the atmosphere or other objects, what is the intensity 30.5 km away
Physics
1 answer:
egoroff_w [7]3 years ago
6 0

Answer:

Intensity of the transmitted radio wave is 5.406 x 10⁻⁶ W/m²

Explanation:

Given;

power of radio transmitter, P = 63.2 kW = 63200 W

distance of transmission, r = 30.5 km

Intensity of the transmitted radio wave is calculated as follows;

I = \frac{P}{4\pi r^2}

where;

I is the intensity of the transmitted radio wave

Substitute the given values and calculate the intensity of the transmitted radio wave;

I = \frac{P}{4\pi r^2} = \frac{63200}{4\pi (30500)^2} = 5.406 *10^{-6} \ W/m^2

Therefore, Intensity of the transmitted radio wave is 5.406 x 10⁻⁶ W/m²

You might be interested in
We know that there is a relationship between work and mechanical energy change. Whenever work is done upon an object by an exter
solniwko [45]

Answer:

* roller skates and ice skates.

* roller coaster

Explanation:

One of the best examples for this situation is when we are skating, in the initial part we must create work with a force, it compensates to move, after this the external force stops working and we continue movements with kinetic energy, if there are some ramps, we can going up, where the kinetic energy is transformed into potential energy and when going down again it is transformed into kinetic energy. This is true for both roller skates and ice skates.

Another example is the roller coaster, in this case the motor creates work to increase the energy of the car by raising it, when it reaches the top the motor is disconnected, and all the movement is carried out with changes in kinetic and potential energy. In the upper part the energy is almost all potential, it only has the kinetic energy necessary to continue the movement and in the lower part it is all kinetic; At the end of the tour, the brakes are applied that bring about the non-conservative forces that decrease the mechanical energy, transforming it into heat.

8 0
3 years ago
PLEASE HELP ):
jolli1 [7]

The first thing we must do for this case is the sum of forces in a horizontal direction.

We have then:

F1 + F2 = m * a

Substituting values we have:

50 + 75 = m * 2.5

From here, we clear the mass of the object:

m * 2.5 = 125\\m = 125 / 2.5\\m = 50 Kg

We now look for the weight of the object.

W = m * g

Where,

g: acceleration of gravity (9.8 m/s^2)

Substituting values:

W = 50 * 9.8\\W = 490 N

Answer:

the weight of the object is:

W = 490 N

option 4

6 0
3 years ago
The amplitude of a mechanical wave shows<br> What?
Anuta_ua [19.1K]
I’m not sure what you are asking
5 0
3 years ago
The state in which a star's gravitational collapse is balanced between gravity pushing inward and gas pressure pushing outward i
Andrew [12]
The relation between temperature and pressure is called the "equation of state of the gas". or "Hydrostatic equilibrium in ordinary star". Take for example a balloon, it will have a larger spherical shape, if the pressure inside exerted by the gas on a wall of a balloon balance the inward force exerted by the outside atmospheric pressure.  In a dying star which is being compressed by gravity, the gas is being squeezed so the molecules is moving rapidly, resulting to a very high temperature, and this provide a balance that counteract or balances the compressive force of gravity. The very high temperature inside the star is needed to balance the force of gravity, and it is provide by "nuclear fusion energy" or else the star would collapse under the force of gravity. Depending on the size or mass of the star, it will either become, a "neutron star" or a "black hole".                 
5 0
3 years ago
Read 2 more answers
How does natural selection produce change in a population of mice?
sergey [27]

Answer:

The population of the mice will decrease to the faster, stronger, and smarter mice because the weaker will die because of natural selection.

Explanation:

5 0
3 years ago
Other questions:
  • A skydiver is in free fall. What is the only force acting upon the skydiver.
    12·1 answer
  • An electromagnetic wave has a frequency of and is traveling in a vacuum. The magnetic field is given by ______.
    14·1 answer
  • The reed switch is placed between the poles of the strong permanent magnet.
    14·1 answer
  • Older railroad tracks in the U.S. are made of 12-m-long pieces of steel. When the tracks are laid, gaps are left between section
    7·2 answers
  • Which of the following will increase if the voltage in a circuit is increased?
    15·2 answers
  • What was the first president of the United States
    15·1 answer
  • How does knowledge of the energy content of food help diabetics make smart choices
    8·1 answer
  • A copper part is heated. Does its mass, volume and density change?
    9·2 answers
  • The distance between the fixed point of a Celsius thermometer is20cm. what is the temperature when the mercury level is 4.5cm ab
    12·1 answer
  • An acrobat on skis starts from rest 50.0 m above the
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!