What evidence suggests that small galaxies in our Local Group have undergone two or more starbursts in the past?
A) We observe several small galaxies currently undergoing massive star formation.
B) We see small galaxies in which many stars have one age and many others have another age that is billions of years older.
C) We see evidence that small galaxies in our Local Group have experienced several collisions in the past.
D) We see evidence that several small galaxies were shot out of larger galaxies in our Local Group during an age of starburst activity.
E) We do not have any evidence that galaxies in our Local Group were once starburst galaxies.
B
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A composite material has a matrix of epoxy with an elastic modulus of 5 GPa and a reinforcement of E-glass fibers with an elastic modulus of 72.4 GPa. Use a computer program to calculate the elastic modulus in both the axial and transverse directions as a function of volume fraction of fibers. Use increments of 0.1 volume fraction and terminate the calculations at a fiber volume fraction of 0.8.
What will be an ideal response?
Newton's first law of motion was very similar to descriptions of motion proposed by _______________
Fill in the blank(s) with correct word
What is the main reason mountaintops are so cold?
A) The air is thinner at higher altitudes. B) Mountaintops are above much of the greenhouse gas in the atmosphere. C) The winds are stronger at higher altitudes. D) There is more water vapor at higher altitudes, causing there to be more snow. E) All of the above are true.
__________ in an x-ray spectrum of an atom occur because electrons in the atom make transitions to lower energy levels after being bombarded with high energy electrons
Fill in the blank(s) with correct word