The theory of general relativity proves that wormholes like those used in science fiction cannot exist
Indicate whether the statement is true or false
FALSE
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The 1420 MHz (21 cm) radio line generated by neutral hydrogen atoms is a good choice for interstellar communications because
A) it is the easiest radio frequency to generate B) it is the only radio frequency that is not blocked by interstellar matter C) all intelligent civilizations should be aware of its universal significance and would probably also think of sending and receiving signals at this frequency D) it is the only frequency to which radio telescopes can be tuned
The dimensional equivalence of the quantity "momentum" in terms of the fundamental quantities (mass, length, time) is:
a. MLT?1. b. ML2T?2. c. MLT. d. MLT?2.
The gas motions within granules on the solar surface are
a. upward in the centers of some cells and downward in others; the gas cools as it passes between individual granules. b. actually motionless. The dark regions are absorption features from gases in the photosphere. c. upward in the bright cell centers and downward around the darker edges. d. downward in the bright cell centers and upward around the darker edges.
A rubber ball and a lump of putty have equal mass. They are thrown with equal speed against a wall. The ball bounces back with nearly the same speed with which it hit. The putty sticks to the wall
Which objects experiences the greater momentum change? A) the ball B) the putty C) Both experience the same non-zero momentum change. D) Both experience zero momentum change. E) Cannot be determined from the information given.