• #### 1.  The velocity in which a body revolves around another body

• Speed
• motion
• orbital velocity
• Acceleration

• Chinese
• Turkish
• German
• Russian
• #### 3.  What is the third law of Kepler

• The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
• None

• 0.240 years
• 0.386 years
• 0.621 years
• #### 5.  Consider the model of Kepler's 2nd Law. Each colored wedge represents the same time interval. Kepler states that the area of each wedge must be equal. According to this, what conclusions can you draw about the movement of any planet?

• An orbiting body travels faster as it gets closer to the central massive body.
• An orbiting body covers the same distance for each time interval because the speed changes.
• #### 6.  Consider the law of gravitational attraction. Two spheres with a mass, M, are attracted to each other by a force, F. If the distance between the two spheres doubles while the masses remain constant, will the force between the two spheres change? If yes, how?

• Yes, the forces decreases by 1/16
• Yes, the force decreases by 1/4

• 1
• 2
• 3
• 4
• #### 8.  In order for a satellite to orbit in a higher orbit, what must be true about its speed

• The orbital speed must be decreased
• The orbital speed must remain the same
• #### 9.  At position A, which hemisphere would have summer?

• Northern hemisphere
• Southern hemisphere
• #### 10.  Types of celestial coordinate system

• Latitude and longitude
• Ecuatorial and horizontal
• None

• obliquity
• precessoin
• inclination
• eccentricity

• 1st Law
• 3rd Law
• #### 13.  Kepler’s 3rd law states the square of the orbital period is proportional to the cube of the orbital radius. (T2=r3)If a planet's orbital radius is doubled, what happens to the length of a year on that planet?

• It will become twice as long
• It will become about 8 times as long
• It will remain the same

• rotation
• revolution
• precession
• nutation

• Line
• Area
• Imagine
• #### 16.  What is the second law of Kepler ?

• All planets move around the Sun in elliptical orbits, with the Sun as one focus of the ellipse.
• The square of the period of any planet is proportional to the cube of the semimajor axis of its orbit.
• The radius vector of a planet sweeps over in equal areas in equal intervals of time.
• None of these
• #### 17.  Firs law of Kepler?

• None
• The orbit of planet is an ellipse with the Sun at one of the two foci
• The radius vector of a planet sweeps over equal areas in equal time intervals of time.
• The square of the orbital period of a planet is directly proportional to the cube of the semi-major axis of its orbit
• #### 18.  An object is _____ if its position changes relative to another object.

• in motion
• at reset
• a frame of refence
• magical

• False

• Circular
• Elliptical
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