The cosmological principle is the ultimate extension of the Copernican principle to the entire universe, in that there is no center at all
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TRUE
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A cylindrical wire has a resistance R and resistivity ?. If its length and diameter are BOTH cut in half,
(a) what will be its resistance? A) 4R B) 2R C) R D) R/2 E) R/4 (b) what will be its resistivity? A) 4? B) 2? C) ? D) ?/2 E) ?/4 What will be an ideal response?
A fighter plane moving 200 m/s fires a projectile with speed 50 m/s in a forward direction. The projectile makes an angle of 30° with the direction of the plane's motion
What is the speed of the projectile with respect to a stationary observer on the ground? A) 293 m/s B) 243 m/s C) 268 m/s D) 250 m/s E) 281 m/s
An electric device delivers a current of 5.0 A for 10 seconds. How many electrons flow through this device?
A) 0.20 B) 20 C) 2.0 D) 3.1 × 1020 E) 31 × 1020
The celestial sphere is divided into 88 modern constellations
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