Radio galaxies emit only radio waves, and are not otherwise observable
Indicate whether the statement is true or false
FALSE
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What is the reactance of a 1.0 mH inductor at 60 Hz?
What will be an ideal response?
Which of the following histories are in the correct order of occurrence?
A) The Big Bang, then the expansion starts, then the Sun and stars make the first elements heavier than helium. B) The Big Bang, then the expansion starts, then stars make the first elements heavier than helium, then the Sun forms. C) The Big Bang happens simultaneously with the start of the expansion of the universe, then the Sun and stars make the first elements heavier than helium. D) The Big Bang happens simultaneously with the start of the expansion of the universe, then stars make the first elements heavier than helium, then the Sun forms.
What will happen in the Sun immediately after it has exhausted its supply of hydrogen in its core?
A) The core will collapse and a supernova will result. B) The Sun will turn into a white dwarf and cool off forever. C) The helium core will shrink, heat, and start fusing helium to carbon. D) The helium core will shrink and heat; a shell of hydrogen will start fusing.
Why would a person be torn apart as he fell feet first into a black hole?
A. Because of the rotation of the black hole. B. because the force on his feet would be much greater than the force on his head. C. Time is distorted so that by the time the light from his feet reached his eyes, years would have elapsed. D. Because of the force of friction. E. Because he would be traveling at the speed of light.