Which of the following natural resources is considered a renewable energy source? A. coal B. natural gas C. wind D. oil

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Ответ:

sayedaly2096

28.08.2020

Geography

Given Data:

At distance d₁ = 4.5×10¹⁰ m, speed of comet is $v_{i}$ = 9.2×10⁴ m/s.

At distance d₂ = 6×10¹² m, speed of comet will be $v_{f}$ = ?

As there is no work done from the outside, so the initial energy of the system will be equal to the final state of energy.

$E_{f} = E_{i}+W\\ K_{f} +U_{f} =K_{i} +U_{i} +0$

$\frac{1}{2}mv^{2} _{f} + \frac{-GMm}{d_{2} } = \frac{1}{2}mv^{2} _{i} + \frac{-GMm}{d_{1} }$

$v_{f} = \sqrt{v^{2} _{i}+2GM[\frac{1}{d_{2}} -\frac{1}{d_{1} } ] }$

Now by putting the values in the above equation we can find out $v_{f}$ . Here M is the mass of sun.

$v_{f} = \sqrt{(9.2*10^{4})^{2} + 2(6.7*10^{-11})(1.98*10^{30})[\frac{1}{6*10^{12}}-\frac{1}{4.5*10^{10} } } } ]$

= 51109.88 m/s

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