The kinetic coefficient of friction is usually larger than the static coefficient of friction
Indicate whether the statement is true or false
FALSE
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What is thought to be the origin of enormous x-ray flares that occasionally come from the direction of Sgr A*?
A) x-ray binary systems that lie close to the galactic center B) massive-star supernovae near the galactic center C) comet-sized objects being torn apart by the tidal forces of the black hole near the galactic center D) supernova shock waves plowing into dense regions of the interstellar medium near the galactic center
After the hydrogen in the star's core is depleted, the core
A. shrinks and heats up. B. shrinks and cools down. C. expands and heats up. D. expands and cools down.
Air is flowing through a rocket nozzle. Inside the rocket the air has a density of 5.25 kg/m3 and a speed of 1.20 m/s. The interior diameter of the rocket is 15.0 cm. At the nozzle exit, the diameter is 2.50 cm and the density is 1.29 kg/m3
What is the speed of the air when it leaves the nozzle? A) 176 m/s B) 29.3 m/s C) 88.0 m/s D) 35.2 m/s E) 343 m/s
Suppose a radioactive isotope has a half-life of 2.0 hours. For an initial sample of 6400 nuclei, the number remaining after 6.0 hours is about ________.
Fill in the blank(s) with the appropriate word(s).