Comparing g at a height and at a depth below the surface

1. A.
   $1 - \frac{r}{R_{E}} - \frac{r^{2}}{R_{E}^{2}} - \frac{r^{3}}{R_{E}^{3}}$
2. B.
   $1 + \frac{r}{R_{E}} + \frac{r^{2}}{R_{E}^{2}} + \frac{r^{3}}{R_{E}^{3}}$
3. C.
   $1 + \frac{r}{R_{E}} - \frac{r^{2}}{R_{E}^{2}} + \frac{r^{3}}{R_{E}^{3}}$
4. D.
   $1 + \frac{r}{R_{E}} - \frac{r^{2}}{R_{E}^{2}} - \frac{r^{3}}{R_{E}^{3}}$

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1. A.
   $4800\text{ }km$
2. B.
   $2560\text{ }km$
3. C.
   $640\text{ }km$
4. D.
   $5260\text{ }km$

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1. A.
   $\sqrt{5}R - R$
2. B.
   $\frac{\sqrt{3}R - R}{2}$
3. C.
   $\frac{R}{2}$
4. D.
   $\frac{\sqrt{5}R - R}{2}$

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1. A.
   0.12
2. B.
   0.25
3. C.
   0.50
4. D.
   0.75

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