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AleksAgata [21]
2 years ago
9

What information do we know about the known exoplanets? a. estimates of orbits and masses b. complete composition c. precise mas

ses d. all of the above e. none of the above
Physics
1 answer:
LenKa [72]2 years ago
5 0

<em>The correct option is </em><em>A</em>. The information we know about the known exoplanets is estimates of orbits and masses.

<h3>What is exoplanets?</h3>

An exoplanet or extrasolar planet is a planet outside the Solar System.

In other words, exoplanet is any planet beyond our solar system.

<h3>Characteristics of exoplanets</h3>

exoplanets are known for the following characteristics;

  • they are usually hot
  • they can orbit their stars so tightly that a “year” lasts only a few days
  • they can orbit two suns at once

Thus, the information we know about the known exoplanets is estimates of orbits and masses.

Learn more about exoplanets here: brainly.com/question/1514493

#SPJ1

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Sand falls from a conveyor belt at a rate of 30 m3m3/min onto the top of a conical pile. The height of the pile is always 3535 o
Reil [10]

Explanation:

As the given data is as follows.

         h = \frac{3}{5}d

            = \frac{3}{5} \times (2r)

Also, we know that r = \frac{4}{3}h

and       Volume (V) = \frac{1}{3} \pir^{2}h

                         = \frac{1}{3} \pi (\frac{4}{3}h)^{2} h

                         = \frac{16}{27} \pi h^{3}

And,  \frac{dV}{dt} = \frac{3 \times 16}{27} \pi h^{2} \frac{dh}{dt}

         \frac{dV}{dt} = \frac{16}{9} \pi h^{2} \frac{dh}{dt}

Putting the given values into the above formula as follows.

       \frac{dV}{dt} = \frac{16}{9} \pi h^{2} \frac{dh}{dt}

       30 m^{3}/min = \frac{16}{9} \pi (2)^{2} \frac{dh}{dt}    

          [tex]\frac{dh}{dt} = 1.343 m/min

or,                        = 134.3 cm/min     (as 1 m = 100 cm)

thus, we can conclude that the height changing at 134.3 cm/min when the pile is 2 m high.

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