What support for the solar nebula theory has come from observations of nearby young stars?
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Many show dusty disks, with large infrared excesses, forming around the stars' equators as the stars condense. In some cases, these disks are seen as dark profiles in front of the star, such as in the Orion Nebula.
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About how many stars has the Hipparcos mission given us accurate distance data on?
A) about 3,000, about half of what you can see with the naked eye alone B) over 6000, the visible naked eye stars and some seen in binoculars C) 60,000, those within about 100 light years of us D) a million, those with parallaxes of .005" or larger E) over 100 billion, almost every star in the galaxy
An AC generator with peak voltage 100 volts is placed across a 10-? resistor. What is the average power dissipated?
A. 100 W B. 150 W C. 500 W D. 1000 W E. 2000 W
An object drops in free fall. At one instant it is moving at a speed of 50 meters per second. Exactly one second later its speed is about
1) 10 m/s. 2) 50 m/s. 3) 60 m/s. 4) 100 m/s. This is because 5) no net force acts on the object while in its state of free fall. 6) it gains a speed of about 10 m/s for each second of fall. 7) its velocity nearly doubles each second.
Partially decomposed organic matter in the soil is
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