Calculate how much work is required to launch a spacecraft of mass m from the surface of the earth (mass mE, radius RE) and place it in a circular low earth orbit--that is, an orbit whose altitude above the earth's surface is much less than RE. (As an example, the International Space Station is in low earth orbit at an altitude of about 400 km, much less than RE
Answers
The work done to launch the spacecraft in low earth orbit is
Work-energy theorem:
The gravitational force is a conservative force. So, the total energy of the system must be conserved.
According to the work-energy theorem:
work done = - change in potential energy of the system.
W = -ΔPE
Initially, the potential energy of the satellite on the surface is:
PE =
where m is the mass of the satellite
Let the orbit be at a height of h from the surface, so the potential energy in the orbit is :
PE' =
ΔPE = PE'-PE
ΔPE =
Now work done:
W = - ΔPE
Thus,
Learn more about work energy theorem:
Answer:
Work done to shift the spacecraft from Earth surface to low Earth radius is given as
Explanation:
As we know that spacecraft is at surface of Earth initially
So we will have
now when it is at low radius Earth Orbit then we have
now we know that work done to shift the spacecraft from Earth Surface to Low earth orbit is change in total energy
so we have
since we know h << Re
so work done is given as
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Answer:Eddy current testing method.
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Planets in our solar system do not revolve around the sun in perfect circles. They revolve in the elliptical orbits.
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The solar system consists of the planet's satellites, as well as numerous comets, asteroids, and meteoroids, as well as the interplanetary medium.
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To learn more about the solar system, refer to the link;
#SPJ2
Answer:
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A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.
B) Warm air rising in a room where the air is moving.
C) The sun warming up the roof on a house.
D) Cold water sinking in a pot of water being warmed up on the stove.
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The situation (heat going through the ceiling) describes
conduction ... heat going from one place to another by
soaking through some material.
A). This is the one. Heat goes from from the marshmallow
to your hand by soaking through the wire. This is conduction too.
B). No. The heat in the room goes from the floor to the ceiling
because the warm air rises and carries it there. This is convection.
C). No. There's nothing for the heat to soak through between
the sun and the roof, and nothing that can move from the sun
to the roof and bring the heat with it. This is radiation.
D). No. Cold water sinks from the surface to the bottom because
warm water rose from the bottom to the surface, taking heat with it.
This is convection.
The answer is
A) Feeling a metal wire get warmer as you roast a marshmallow over a fire.
HOPE I HELPED (: