Which statement about the stages of starbirth is FALSE?
A) At stage 1, only the cloud exists.
B) By stage 3, the star has formed a photosphere.
C) Nuclear reactions begin in the core by stage 4.
D) The T-Tauri wind is prevalent in stage 5.
E) By stage 7, the star has reached the main sequence.
C
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If the 14 billion year history of the universe were compressed to one year, and "now" is exactly midnight December 31, approximately how long ago were your grandparents born?
A) 0.15 second ago B) 1 second ago C) 1 minute ago D) 1 hour ago
A parallel plate capacitor is connected to a battery and charged to voltage V. Leah says that the charge on the plates will decrease if the distance between the plates is increased while they are still connected to the battery. Gertie says that the charge will remain the same. Which one, if either, is correct, and why?
a. Gertie, because the maximum voltage is determined by the battery. b. Gertie, because the capacitance of the capacitor does not change. c. Leah, because the capacitance decreases when the plate separation is increased. d. Leah, because the capacitance increases when the plate separation is increased. e. Neither, because the charge increases when the plate separation is increased.
If you could measure the mass of a moving object, you would find that it was greater than its value when stationary
Indicate whether the statement is true or false
As the average estimated lifetime of a technical civilization increases, then the distances between neighboring civilizations would ________
Fill in the blank(s) with correct word