A satellite orbits the earth a distance of 1.50 × 107 m above the planet's surface and takes 8.65 hours for each revolution about the earth. The earth's radius is 6.38 × 106 m. The acceleration of this satellite is closest to
A) 0.870 m/s2.
B) 0.0690 m/s2.
C) 9.80 m/s2.
D) 2.72 m/s2.
E) 1.91 m/s2.
A
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Which sequence is correct when ordered by increasing size?
a. Earth, Solar System, Milky Way Galaxy, clusters of galaxies b. Solar System, Earth, galaxy clusters, Milky Way Galaxy c. Earth, Milky Way Galaxy, Solar System, galaxy clusters d. Galaxy clusters, Solar System, Milky Way Galaxy, Earth
A constant force of 15 N in the negative y direction acts on a particle as it moves from the origin to the point 
m. How much work is done by the given force during this displacement?
A. +45 J B. ?45 J C. +30 J D. ?30 J E. +75 J
An object of mass 10.0 kg is initially at rest. A 100 N force causes it to move horizontally through a distance of 6.00 m. What is the change in the kinetic energy of this object?
A) 0 J B) 200 J C) 60.0 J D) 600 J E) 1000 J
Laplace's nebular hypothesis was problematic in that he could not explain ____
a. the different types of planets b. the rotational direction of the planets c. how the Sun had <0.5% of the Solar System's angular momentum d. how one star could come within a close encounter of another star e. how gravity was the dominant force of planet formation