Optical fibers are commonly used by
A) surgeons.
B) mechanics.
C) engineers.
D) aviators.
E) all of the above
Answer: E
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If the Hubble Constant is 70 km/sec/Mpc, the accelerating universe is about 10 billion years old
Indicate whether the statement is true or false
The Caloris Basin on Mercury covers a large region of the planet and contains relatively few smaller craters. From this, we conclude that
A) erosion destroyed most of the smaller craters that formed on the basin. B) Mercury's atmosphere prevented smaller objects from hitting the surface. C) only very large impactors hit Mercury's surface in the past. D) the Caloris Basin formed toward the end of the heavy bombardment. E) the Caloris Basin was formed by a volcano.
Three spaceships A, B, and C are in motion, as shown in the figure. The commander on ship B observes ship C approaching with a relative velocity of 0.78c
The commander also observes ship A, advancing in the rear, with a relative velocity of 0.31c. What is the velocity of ship C, relative to an observer on ship A? A) 0.88c B) 0.38c C) 1.4c D) 0.62c E) 1.1c
Parallel-Plate Capacitor: Each plate of an ideal air-filled parallel-plate capacitor has an area of 0.0010 m2, and the separation of the plates is 0.050 mm. An electric field of 7.4 × 106 V/m is present between the plates. What is the capacitance of this capacitor? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 180 pF B. 120 pF C. 300 pF D. 240 pF E. 360 pF