Satellite Motion: In another solar system, a planet has a moon that is 4.0 × 105 m in diameter. Measurements reveal that this moon takes 3.0 × 105 s to make each orbit of diameter 1.8 × 108 m. What is the mass of the planet? (G = 6.67 × 10-11 N ? m2/kg2)
A. 1.2 × 1024 kg
B. 1.7 × 1024 kg
C. 2.4 × 1024 kg
D. 3.4 × 1024 kg
E. 4.8 × 1024 kg
Answer: E
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Two bodies can be in thermal equilibrium with one another when they are at the same temperature even if they
A. absorb different quantities of thermal energy from their surroundings in equal time intervals. B. have different masses. C. have different volumes. D. have any of the properties listed above. E. have any of the properties listed above and one of them is contact with a third body at a different temperature.
In what range of masses are most stars found?
A) 0.01 to 100 solar masses B) 1 to 3 solar masses C) 0.1 to 100 solar masses D) 0.1 to 2 solar masses E) Stars can have any mass.
Exhibit 4-2Newton approximated motion in a circle as a series of linear motions, as in the polygon below.
Assume that the particle moves at constant speed vA from A to B, and at constant speed vB from B to C.Use this exhibit to answer the following question(s).
Refer to Exhibit 4-2. The direction of the acceleration, 
, at point B, is shown by the arrow in
A.
B.
C.
D.
E.
A toy gyroscope (a.k
a. a top) consists of a solid disk with a thin rod projecting perpendicular to the center of the disk. The rod, which serves as the rotational axis for the gyroscope, projects on both sides of the disk. The gyroscope is placed with one end of the axis on the surface of the table, and spun so that the rotation of the disk viewed from above is counterclockwise. Alas, the axis of rotation is not quite perpendicular table surface and so the gyroscope precesses. Viewing from above, with the end of the axis in contact with the table staying in the same spot, in what direction does the other end of the axis of the gyroscope precess? a. The precession is clockwise. b. The precession is counterclockwise. c. In the northern hemisphere the precession is clockwise, but in the southern hemisphere it is counterclockwise. d. In the northern hemisphere the precession is counterclockwise, but in the southern hemisphere it is clockwise.