Components: A player throws a football 50.0 m at 61.0° north of west. What is the westward component of the displacement of the football?
A. 64.7m
B. 55.0 m
C. 0.00 m
D. 74.0 m
E. 24.2 m
Answer: E
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Velocity Addition: Consider three galaxies, Alpha, Beta and Gamma. An astronomer in Beta sees each of the other two galaxies moving away from him in opposite directions at 0.70c. At what speed would an observer in Alpha see the galaxy Gamma moving?
A. 0.70c B. 1.4c C. 0.82c D. 0.94c E. 0.98c
Which statement about the magnetic fields of Uranus and Neptune is FALSE?
A) Neither fits the Dynamo model very well. B) Uranus' field is tilted 60 degrees off its already tilted rotational axis. C) Neptune's field is tilted 47 degrees to its more conventional rotational axis. D) Both pass directly through the cores of their planets, like all other fields. E) Both may have ammonia water replacing the liquid metallic hydrogen.
Find the electrical potential at 0.25 m from a point charge of 7.0 ?C. (ke = 8.99 × 10^9 N?m2/C2)
a. 3.4 × 10^4 V b. 2.5 × 10^5 V c. 3.2 × 10^6 V d. 3.2 × 10^7 V e. 3.4 × 10^5 V
The percentage of a radionuclide that would remain after 4 half-lives is ______________
Fill in the blank(s) with correct word