When we add a displacement vector to another displacement vector, the result is:
a. a velocity.
c. another displacement.
b. an acceleration.
d. a scalar.
C
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Why is the cosmic microwave background (CMB) so cold if the early universe was so hot?
a. Enough time has passed for matter in the universe to release enough heat to cool down. b. The CMB constantly interacts with atoms, which effectively cool down the photons. c. The expansion of the universe has redshifted those photons to an effectively cooler temperature. d. Misleading; The Big Bang was initially hot but the CMB was released from cold material much later on.
Ilona and Olivia observe a virtual image formed by an object placed a distance 
in front of a convex lens of focal length f. They argue about where to place a concave lens of focal length ?f to have a virtual image at the same location relative to the lens that they had with the convex lens. Ilona says that the object should also be placed a distance 
/> in front of the concave lens. Olivia says that this won't work. Which one, if either, is correct, and why? A.
B.
C.
D.
, then d0 was d0 = ?.E.
Parallel-Plate Capacitor: An ideal air-filled parallel plate capacitor with plate a separation of 4.0 cm has a plate area of 0.040 m2. What is the capacitance of this capacitor with air between these plates? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 89 pF B. 8.9 pF C. 0.89 pF D. 8.9 µF E. 8.9 nF
The Oort Cloud is believed to be
A) a grouping of asteroids and meteoroids between the orbits of Mars and Jupiter. B) the great nebula found just below the belt stars of Orion. C) a spherical cloud of cometary nuclei far beyond the Kuiper Belt. D) a flattened belt of cometary nuclei just beyond the orbit of Neptune. E) the circular disk of gas around the Sun's equator from which the planets formed.