What are two differences observed between Type I and Type II supernovae?
What will be an ideal response?
Type I supernovae have very little hydrogen and their light curve drops off gradually but steadily. A Type II supernova is hydrogen rich and its light curve has a distinctive plateau where the luminosity remains constant for a time.
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An atom which has 4 protons and 6 neutrons will be electrically neutral if it contains
A) 4 electrons. B) 6 electrons. C) 10 electrons. D) at least one electron.
The shapes of planetary orbits are __________
Fill in the blank(s) with correct word
At t = 0, a wheel rotating about a fixed axis at a constant angular acceleration has an angular velocity of 2.0 rad/s. Two seconds later it has turned through 5.0 complete revolutions. What is the angular acceleration of this wheel?
a. 17 rad/s2 b. 14 rad/s2 c. 20 rad/s2 d. 23 rad/s2 e. 13 rad/s2
Velma passes Mort at a high speed. Velma and Mort each have identical light-clocks. Mort and Velma both observe both clocks to "tick" simultaneously at 12 noon on both clocks. Velma observes that Mort's next tick occurs
A) before or after or at the same time as her own tick, depending on Velma's precise speed relative to Mort. B) at the same time as the tick on her clock. C) before her own clock ticks. D) after her own clock ticks. E) only when the moon is full.