Why are periods the most fundamental time unit?
What will be an ideal response?
Answer: Periods are small enough time units to chronicle major changes in life forms. Eras are far too big, and epochs are too small.
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Contrast the deaths of low- versus high-mass stars
What will be an ideal response?
Which of the following types of protogalactic clouds is most likely to form an elliptical galaxy?
A) a low-density cloud with quite a bit of angular momentum B) a dense cloud with quite a bit of angular momentum C) a very low-density cloud with very little angular momentum D) a very massive cloud with any density and a lot of angular momentum E) a dense cloud with very little angular momentum
Astronaut Jennifer's lifeline to her spaceship comes loose and she finds herself stranded, "floating" 100 m from the mothership. She suddenly throws her 2.00-kg wrench at 20 m/s in a direction away from the ship
If she and her spacesuit have a combined mass of 200 kg, how long does it take her to coast back to her spaceship? A) 1000 s B) 750 s C) 500 s D) 250 s E) 2.50 min
An electrostatic precipitator uses an electric field to remove smoke from the air
Indicate whether the statement is true or false