Astronomers believe that gamma-ray bursters emit radiation equally in all directions
Indicate whether the statement is true or false
FALSE
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Why is Saturn's moon Titan able to retain an atmosphere?
a. Titan only contains light gases which are easy to retain. b. Titan has a large enough mass and is cold enough. c. Titan is biologically active. d. It is so close to Saturn that Saturn's gravity retains Titan's atmosphere.
A sealed cup of water is placed in a microwave oven. The water absorbs microwave energy, which causes its atoms to vibrate more vigorously, making the water warmer. In this process, the mass of the water in the cup:
A. Increases B. Decreases C. Does not change
What type of object is believed to be the central source of energy for an active galaxy?
A. globular cluster B. a large amount of gas and dust C. an unusually large and bright main sequence star D. a massive black hole
The water level in a reservoir is maintained at a constant level. What is the exit velocity in an outlet pipe 3.0 m below the water surface?
a. 2.4 m/s b. 3.0 m/s c. 5.4 m/s d. 7.7 m/s e. 49 m/s