Explain how the resonance among Io, Europa, and Ganymede makes their orbits slightly elliptical
What will be an ideal response?
For every orbit that Ganymede completes around Jupiter, Europa completes exactly two orbits and Io completes exactly four. Therefore, all three planets line up for every orbit of Ganymede, and Io and Europa line up twice each Ganymede orbit. The gravitational tugs from their sister moons add up over time, and these tugs are always in the same direction. Therefore, the moons' orbits become slightly elliptical over time.
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A satellite is placed in a geosynchronous orbit. In this equatorial orbit with a period of 24 hours, the satellite hovers over one point on the equator. Which statement is true for a satellite in such an orbit?
a. There is no gravitational force on the satellite. b. There is no acceleration toward the center of the Earth. c. The satellite is in a state of free fall toward the Earth. d. There is a tangential force that helps the satellite keep up with the rotation of the Earth. e. The force toward the center of the Earth is balanced by a force away from the center of the Earth.
Exhibit 11-1
Two birds of prey hurtling after the same mouse collide in mid-air and grab each other with their talons. Each 250-g bird is flying at 30 m/s at a 60° angle to the ground.
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Use this exhibit to answer the following question(s).
Refer to . What is the horizontal component of their momentum, in 
Oil flows through the Alaska pipe line on a clear, sunny day. The flow in the pipe can best be classified as:
(A) Uniform (B) Developed (C) Two-dimensional (D) Cylindrical
Projectile Motion: A projectile is fired from ground level on a horizontal plain. If the initial speed of the projectile is now doubled, and we neglect air resistance,
A. its range will be increased by 
.
B. its range will double.
C. its range will be decreased by a factor of two.
D. its range will quadruple.
E. its range will decrease by a factor of four.