Although theory says a massive black hole with an accretion disk should be emitting X-rays, many black holes emit:
A) mostly in the infrared.
B) only in the visible.
C) mainly in the gamma.
D) virtually no radiation at all.
E) equally across the entire electromagnetic spectrum.
A
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When a capacitor is fully charged, the current through the capacitor in a direct-current circuit is
a. zero. b. at its maximum value. c. equal to the current in a resistive circuit in parallel with the capacitor circuit. d. greater than the current in a resistor that is farther from the battery than the capacitor. e. zero if it is the only capacitor, but maximum if there is another capacitor in series with it.
Rotational Kinetic Energy: The L-shaped object shown in the figure consists of three small masses connected by thin uniform rods, each rod of mass 3.00 kg. Assume that the masses shown are accurate to three significant figures. How much work must be done to accelerate the object from rest to an angular speed of 3.25 rad/s about the y-axis?
Fill in the blank(s) with the appropriate word(s).
This diagram represents the carbon dioxide cycle. Which position in the diagram represents the part of the cycle in which carbon dioxide is turned into carbonate minerals and rock?
A) Position 1 B) Position 2 C) Position 3 D) Position 4
What evidence do we have that life arose fairly quickly on Earth?
What will be an ideal response?