The first successful attempt to establish the size of the earth is credited to ________.
eratosthenes
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The three point charges +4.0 ?C, -5.0 ?C, and -9.0 ?C are placed on the x-axis at the points x = 0 cm, x = 40 cm,
and x = 120 cm, respectively. What is the x component of the net electrostatic force exerted on the -9.0 ?C charge by the other two charges? (k = 1/4??0 = 9.0 × 109 N ? m2/C2 ) A) -0.55 N B) 0.55 N C) 0.64 N D) 0.41 N E) -0.41 N
LR Circuits: What resistance should be added in series with a 6.0 H inductor to give a circuit with a time constant of 3.0 ms?
A. 2.0 k? B. 18 ? C. 2.0 ? D. 2.9 ?
Asteroids are located in the Kuiper belt.
Answer the following statement true (T) or false (F)
The first successful determination of the finite speed of light is credited to
A) Galileo. B) Roemer. C) Einstein. D) Newton. E) Franklin.