Orbital speed of one orbiting body from another's speed and the ratio of orbit radii

1. A.
   $\frac{v}{10}$
2. B.
   $\frac{v}{2}$
3. C.
   $2v$
4. D.
   $10v$

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1. A.
   3 V
2. B.
   4 V
3. C.
   12 V
4. D.
   $\frac{3}{4}\text{ }V$

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1. A.
   $2\sqrt{3}\text{ }V$
2. B.
   $\frac{2\text{ }V}{\sqrt{3}}$
3. C.
   $\frac{V}{2}$
4. D.
   $\frac{V}{\sqrt{3}}$

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1. A.
   $\dfrac{1}{\sqrt{10}}$
2. B.
   $\sqrt{10}$
3. C.
   $10$
4. D.
   $10\sqrt{10}$

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1. A.
   $\dfrac{V}{3}$
2. B.
   $\dfrac{V}{5}$
3. C.
   $\dfrac{V}{15}$
4. D.
   $\sqrt{15}\,V$

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