Viscous force on a ball at terminal velocity (weight minus buoyancy)

1. A.
   $mg\left( 1 - \frac{d_{1}}{d_{2}} \right)$
2. B.
   $mg\left( 1 - \frac{d_{2}}{d_{1}} \right)$
3. C.
   $mg\left( \frac{d_{1}}{d_{2}} - 1 \right)$
4. D.
   $mg\left( \frac{d_{2}}{d_{1}} - 1 \right)$

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1. A.
   $F = Mg\left( 1 - \frac{\rho_{0}}{\rho} \right)$
2. B.
   $F = Mg\left( 1 + \frac{\rho}{\rho_{0}} \right)$
3. C.
   $F = Mg\left( 1 + \frac{\rho_{0}}{\rho} \right)$
4. D.
   $F = Mg\left( 1 \pm \rho\rho_{0} \right)$

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1. A.
   $mg\left( \frac{\rho_{0}}{\rho} - 1 \right)$
2. B.
   $mg\left( 1 + \frac{\rho}{\rho_{0}} \right)$
3. C.
   $mg\left( 1 - \rho\rho_{0} \right)$
4. D.
   $mg\left( 1 - \frac{\rho_{0}}{\rho} \right)$

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

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