In our part of the universe, antimatter is
A) non-existent.
B) plentiful.
C) short-lived.
D) long-lived.
Answer: C
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A 140 gm baseball with a velocity of 25.0 m/s is hit by a baseball bat and leaves at 30.0 m/s in the opposite direction. If the ball was in contact with the bat for 12.0 ms, what is the average force on the ball?
A. 750 N B. 642 N C. 550 N D. 482 N E. 366 N
The force that accelerates the orange and apple system featured in your textbook is actually supplied by the
A) apple. B) orange. C) floor.
It appears that while they are similar in size, Ganymede is much more differentiated than Callisto
Indicate whether the statement is true or false
Which of the following statements best describes Einstein's contributions and views about quantum theory?
A) He didn't make any significant contributions to the theory, but he did accept quantum theory. B) Despite his important work on relativity, Einstein didn't make any important contributions to quantum theory, and furthermore he never really accepted quantum theory. C) Although his work on the photoelectric effect was an important contribution to quantum theory, Einstein never really accepted quantum theory. D) Although his work on the quantum theory of atoms was an important contribution, Einstein never really accepted quantum theory. E) His work on the photoelectric effect was an important contribution to quantum theory, and he accepted the theory as a correct description of the microscopic world.