When an aging massive star generates an iron core, the iron cannot fuse and thus the star cannot support its weight outside the core. The star is no longer in hydrostatic equilibrium and collapses, forming a supernova
a. True
b. False
Indicate whether the statement is true or false
True
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Intensity of Sound: What is the intensity of a 70-dB sound? The threshold of human hearing is 1.0 × 10-12 W/m2.
A. 10-4 W/m2 B. 10-5 W/m2 C. 10-6 W/m2 D. 10-7 W/m2
A 4.00 kg object is moving at 5.00 m/s NORTHWEST. It strikes a 6.00 kg that is moving SOUTHWEST at 2.00 m/s. The objects have a completely inelastic (stick together) collision. The kinetic energy lost in the collision is
A. 20.4 J. B. 28.7 J. C. 34.8 J. D. 40.2 J. E. 45.1 J.
Branch lengths in the tree of life are a measure of the
A) rate of evolution between different species B) size difference between species C) life expectancy difference between species D) amount of genetic difference between different species
A spaceship is moving away from the earth with a constant speed of 0.80c. The spaceship fires a 28-kg missile with a speed of 0.50c relative to the spaceship
What is the speed of the missile measured by observers on the earth if the missile is fired (a) away from the earth? (b) toward the earth?