what is the minimum energy input necessary to place this satellite in orbit? ignore air resistance but include the effect of the planet's daily rotation. (use the following as necessary: re, me, g, m, h, and te for the period of earth's rotation.)



Answer :

The minimum energy input necessary to place this satellite in orbit is

[tex]\frac{1}{2} m(v^{2} - v_{e} ^{2} ) +GM_{E} m(\frac{1}{r} -\frac{1}{R_{E} } )[/tex]

The mass of the satellite = m

Altitude = h = r

The radius of the Earth = [tex]R_{E}[/tex]

The Mass of the Earth = [tex]M_{E}[/tex]

Speed of the satellite = v

Speed of the Earth = [tex]v_{e}[/tex]

Gravitational Constant = G

The energy at the surface of the Earth will be the sum of the kinetic and potential Energy,

So,

[tex]E_{i} = K.E. +P.E.\\\\ E_{i} = \frac{1}{2} mv_{e} ^{2} -\frac{GM_{E} m}{r}[/tex]

Also, Energy in orbit,

[tex]E_{i} = K.E. +P.E.\\\\ E_{i} = \frac{1}{2} mv^{2} -\frac{GM_{E} m}{R_{E} }[/tex]

Now, The change in energy is the minimum energy required to place this satellite in orbit,

Then, the Change in Energy =

∆E [tex]= \frac{1}{2} m(v^{2} - v_{e} ^{2} ) +GM_{E} m(\frac{1}{r} -\frac{1}{R_{E} } )[/tex]

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