Compare the amount of time a 20 solar mass star will stay on the main sequence to the length of time its iron core can exist
What will be an ideal response?
A 20 solar mass star will stay on the main sequence for 10 million years. Its iron core can exist for only a day.
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A bullet is fired from ground level with a speed of 150 m/s at an angle 30.0° above the horizontal at a location where g = 10.0 m/s2. What is the horizontal component of its velocity when it is at the highest point of its trajectory?
A) 0 m/s B) 10 m/s C) 75.0 m/s D) 130 m/s E) 150 m/s
For this situation, I push on a heavy chair. Suppose I push very hard on the chair, and this time the both the chair moves and I slip backward as well. Then the strength of the force the chair exerts on me is
a. less than the force I exert on the chair b. equal to the force I exert on the chair c. greater than the force I exert on the chair d. zero
Initially, fewer neutrinos were detected than predicted by theoretical models because
A) neutrinos changed form to undetected types of neutrinos. B) the wrong liquid was being used in neutrino detectors. C) particle physicists did not understand the proton-proton chain. D) the proton-proton chain does not actually produce neutrinos. E) neutrinos take many years to pass out of the sun from its core.
Which of the following best describes how galaxies are distributed on large scales in the universe?
A) Galaxies are distributed in a great shell expanding outward from the center of the universe. B) Galaxies are randomly distributed. C) Galaxies are uniformly distributed. D) Galaxies appear to be distributed in chains and sheets that surround great voids. E) Galaxies are distributed in a hierarchy of clusters, superclusters, and hyperclusters.