Why do quasars die out over time?
What will be an ideal response?
The black hole at their center consumes the fuel supply close to it. As less material falls into the central engine, less radiation is given off.
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Addition by Components: Three ropes are tied in a knot as shown in the figure. One student pulls on rope A with 1.0 pound of force, and another student pulls on rope B with 7.0 pounds of force. How hard and in what direction must you pull on rope C to balance the first two pulls? Give the direction by specifying the angle (clockwise or counterclockwise) of the pull with the direction of rope A.
What will be an ideal response?
Which of the following types of molecule is the most abundant in an interstellar molecular cloud?
A) CO B) H2O C) H2 D) NH3
A device that measures absolute air pressure is called a __________
Fill in the blank(s) with correct word
An electrical generating plant operates at a boiler temperature of 220°C and exhausts the unused heat into a nearby river at 19°C. If the generating plant has a power output of 800 megawatts (MW) and if the actual efficiency is 3/5 the theoretical efficiency, how much heat per second must be delivered to the boiler? (0°C = 273 K)
a. 5200 MW c. 3270 MW b. 1810 MW d. 2620 MW