Tycho failed to detect ______ for the nova of 1572 indicating it was ______
a. parallax; beyond the orbit of Earth's Moon
b. parallax; inside the Earth's atmosphere close to Earth
c. light; beyond the orbit of Earth's Moon
d. light; inside the Earth's atmosphere close to Earth
a
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The logarithm of the ratio of the initial cross-sectional area to the area at the location of fracture of a specimen is equal to the _____________ to fracture.
Fill in the blank(s) with the appropriate word(s).
The magnetic force between parallel wires is used by the National Bureau of Standards to define the
A) Newton. B) Tesla. C) square-meter. D) Ampere. E) Coulomb.
An electric field of 4.0 mV/m is induced at a point 2.0 cm from the axis of a long solenoid (radius = 3.0 cm, 800 turns/m). At what rate is the current in the solenoid changing at this instant?
a. 0.50 A/s b. 0.40 A/s c. 0.60 A/s d. 0.70 A/s e. 0.27 A/s
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