The first successful attempt to establish the size of the earth is credited to ________.
eratosthenes
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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 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
The first successful determination of the finite speed of light is credited to
A) Galileo. B) Roemer. C) Einstein. D) Newton. E) Franklin.