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Question 1
According to Newton's law of universal gravitation, how does the gravitational force between two point masses change if the distance between their centers is doubled?
Correct Answer:
The force decreases to one-fourth of its original value.
Question 2
Calculate the gravitational field strength (g) at Earth's surface, assuming Earth is a homogeneous sphere of mass M = 5.97 x 10^24 kg and radius R = 6.37 x 10^6 m. (Use G = 6.674 x 10^-11 N m^2/kg^2).
Correct Answer:
9.81 m/s^2
Question 3
What is the gravitational potential V at a distance r from a point mass M, taking zero potential at infinity?
Correct Answer:
V = -G * M / r
Question 4
A space probe orbits Earth at an altitude h equal to Earth's radius (h = R_E). What is the gravitational acceleration experienced by the probe at this altitude in terms of surface acceleration g_0 = 9.81 m/s^2?
Correct Answer:
2.45 m/s^2 (g_0 / 4)
Question 5
Which expression gives the orbital speed v of a satellite in a stable circular orbit of radius r around a planet of mass M?
Correct Answer:
v = sqrt(G * M / r)
Question 1
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About this Exam

Prepare with the Valencian Community PAU Physics Practice Questions - Valencian Community PAU Physics (Física - Proves d'Accés a la Universitat) Exam practice quiz. This question bank includes 100 questions covering field, calculate, magnetic, earth, and radius. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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Valencian Community PAU Physics Practice Questions - Valencian Community PAU Physics (Física - Proves d'Accés a la Universitat) Exam

This practice set contains 100 questions from the matching question bank and focuses on field, calculate, magnetic, earth, and radius. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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