The white arrow points to an object that lies within the disk of the galaxy shown. What is this object?
A) a supernova
B) an accretion disk around a supermassive black hole
C) an extremely bright supergiant star
D) an ionization nebula
A) a supernova
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A carpenter is driving a 15.0-g steel nail into a board. His 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. Half of the kinetic energy of the hammer is converted into internal energyin the nail and does not flow out of the nail
What is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? The specific heat of steel is 448 J/kg ? K. A) 8.1 K B) 3.6 K C) 1.8 K D) 2.7 K E) 7.7 K
Radiation Pressure: Except for their color, a perfectly black (absorbing) object is identical to a perfectly white (reflecting) object. If identical light falls on both of these objects, what is true about the momentum they will receive from this light?
A. The black object will receive twice as much as the white object. B. They will both receive the same amount. C. The white object will receive twice as much as the black object. D. The black object will receive four times as much as the white object. E. The white object will receive four times as much as the black object.
Assuming the conditions ripe for life and intelligence abound in the Galaxy, what factor limits the number of galactic civilizations?
A) the lack of metals for technology B) the number of supernova explosions C) the expansion of the Universe D) the average survival time of the civilizations E) the speed of technological development
To calculate the masses of stars in a binary system, we must measure their
A) orbital period and average orbital distance. B) spectral types and distance from Earth. C) absolute magnitudes and luminosities. D) luminosities and distance from Earth.