An object is dropped from a helicopter. When it reaches terminal velocity
A) the acceleration finally reaches g.
B) gravity no longer acts upon it.
C) all of the upward forces add up to zero.
D) the total force is zero.
E) the acceleration of gravity, g, becomes 0.
D
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Sun is considered to be a
A) low-mass star. B) intermediate-mass star. C) high-mass star. D) brown dwarf.
Which of the following represents the longest distance?
a. One parsec b. One astronomical unit c. One light-year d. One right ascension
What are comets made of?
A) silicates and rocky dust B) metallic dust particles C) dark colored complex hydrocarbons D) methane, ammonia, and water ice E) All of the above.
A bucket is being lowered by a very light rope with a constant downward velocity. The force that the rope exerts on the bucket must be
A) equal to the force that Earth exerts on the bucket. B) greater than the force that Earth exerts on the bucket. C) less than the force that Earth exerts on the bucket.