The idea of rapidly rotating white dwarf stars to explain pulsars was immediately ruled out because such objects would not be ________ enough to spin that rapidly
Fill in the blank(s) with correct word
small
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Gamma ray bursts are ____
a. too weak to affect life on Earth b. an important influence on mutation and evolution c. the cause of the spectacular auroras at high latitudes d. triggers for solar flares and coronal mass ejections e. capable of causing mass extinction events
What are Kepler's three laws?
What will be an ideal response?
A 5.00 kg ball is traveling at 4.0 m/s and strikes a wall. The ball bounces off the wall with a velocity of 4.0 m/s in the opposite direction. If the contact with the wall by the ball lasts for 0.10 seconds, then the magnitude of the impulse on the ball is
A. 24 kg m/s. B. 30 kg m/s. C. 36 kg m/s. D. 40 kg m/s. E. 50 kg m/s.
Life jackets help you float because
A) the jacket causes you to weigh less. B) the jacket has the same density as an average human. C) the jacket repels water. D) if you sink, the jacket sinks. E) the combined density of you and the jacket is less than your density alone.