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Ap Physics 1 Free Response Questions 2018

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Sandra Watson
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John F. Kennedy University

Directions: Questions 1, 4, and 5 are short free-response questions that require about 13 minutes each to answer and
are worth 7 points each. Questions 2 and 3 are long free-response questions that require about 25 minutes each to
answer and are worth 12 points each. Show your work for each part in the space provided after that part.
1. (7 points, suggested time 13 minutes)
A spacecraft of mass m is in a clockwise circular orbit of radius R around Earth, as shown in the figure above.
The mass of Earth is ME .
(a) In the figure below, draw and label the forces (not components) that act on the spacecraft. Each force must
be represented by a distinct arrow starting on, and pointing away from, the spacecraft.
(b)
i. Derive an equation for the orbital period T of the spacecraft in terms of m, ME
, R, and physical
constants, as appropriate. If you need to draw anything other than what you have shown in part (a) to
assist in your solution, use the space below. Do NOT add anything to the figure in part (a).
ii. A second spacecraft of mass 2m is placed in a circular orbit with the same radius R. Is the orbital
period of the second spacecraft greater than, less than, or equal to the orbital period of the first
spacecraft?
____ Greater than ____ Less than ____ Equal to
Briefly explain your reasoning.

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Ap Physics 1 Free Response Questions 2018

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