A black hole may be visible because electromagnetic radiation is emitted from a(n) ________ surrounding it, heated up enough to emit X-rays
Fill in the blank(s) with correct word
accretion disk
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The night sky is dark because the Universe is not infinitely old
a. True b. False Indicate whether the statement is true or false
The inability to observe parallax of stars contributed to the ancient Greek astronomers' rejection of the idea that Earth revolves around the Sun.
Answer the following statement true (T) or false (F)
The newton is a unit of
A) force. B) mass. C) density. D) inertia.
When a microwave filter consisting of vertical parallel metal rods is in the absorbing position, oscillating currents are set up in the rods. At any one instant, the current in each rod has the same magnitude and direction. At that instant
A. the rods will try to move apart horizontally. B. the rods will try to move together horizontally. C. the rods will try to shift vertically upwards. D. the rods will try to shift vertically downwards. E. the rods will not be affected because the source of current is not a battery.