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PAU Physics (Cantabria) Practice Questions - Cantabria PAU Physics 2026 (Pruebas De Acceso A La Universidad, Universidad De Cantabria) Exam

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The gravitational potential at a point outside a planet of mass $M = 4.0 \times 10^{24}\text{ kg}$ is $V = -4.0 \times 10^7\text{ J/kg}$. What is the distance $r$ from the center of the planet to this point? ($G = 6.67 \times 10^{-11}\text{ N}\cdot\text{m}^2/\text{kg}^2$)
Correct Answer:
6.67 × 10⁶ m

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