As you know, the Earth has an orbital period of one year at an orbital radius of one AU. If a new "minor planet" were to be found in a circular orbit with radius 13. AU, what would be its period?
What will be an ideal response?
Remembering Kepler's 3rd law: T2 =k R3 so T = 47. years at R=13. AU.
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Radioactivity Basics: A sodium-22 nucleus, 
Na, decays into a neon-22 nucleus, 
Ne, and one other particle. What is the other particle?
Fill in the blank(s) with the appropriate word(s).
Which of the following lists the planets of our solar system in the correct order from closest to farthest from the Sun?
A) Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune B) Mercury, Earth, Venus, Mars, Jupiter, Saturn, Neptune, Uranus C) Mercury, Venus, Mars, Earth, Saturn, Jupiter, Neptune, Uranus D) Earth, Mars, Mercury, Venus, Jupiter, Saturn, Uranus, Neptune
The spectrum of a mercury vapor lamp under very high pressure appears as that from
A) an incandescent source. B) a laser. C) an ultraviolet source. D) a gas other than mercury. E) a monochromatic source.
A projectile is fired from ground level at an angle of 40.0° above horizontal at a speed of 30.0 m/s. What is the speed of the projectile when it has reached a height equal to 50.0% of its maximum height?
A) 26.7 m/s B) 26.0 m/s C) 28.7 m/s D) 27.4 m/s E) 28.1 m/s