How are interstellar bubbles of hot, ionized gas made?
A) by the collapse of a gas cloud to form stars
B) by the ejection of planetary nebulae from low-mass stars
C) by the winds of massive stars and supernovae explosions
D) by collisions between the Milky Way and satellite dwarf galaxies
E) by the rapidly rotating magnetic fields of pulsars
C) by the winds of massive stars and supernovae explosions
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This graph shows the brightness of a star over the course of a transit. Which of the following do we learn about the planet? "
A) It is large enough to block about 2.5% of the star's light. B) It has an orbital period of less than 2 hours. C) It is about 2.5% as massive as the star. D) It is about 97.5% as bright as its star.
Compare the kinetic energy of two balls: ball 1: mass m thrown with speed 2v ball 2: mass 2m thrown with speed v
A. KE1 = 4KE2 B. KE1 = KE2 C. 2KE1 = KE2 D. KE1 = 2KE2
Which of the following places is the result of volcanoes erupting over a hot spot in the mantle?
A) the Himalayas B) the Appalachians C) California D) Hawaii
Collisions in which kinetic energy is conserved are said to be ineleatic collisions
Indicate whether the statement is true or false