A shiny, spherical, metal alien jumps out of a perfectly good airplane and skydives for a few seconds. Its photographic friend snaps photos of the sphere with a special camera that also captures the forces on the object. Refer to the set of snapshots Q, J, Y, and L. Which snapshot depicts the forces just after the parachute has fully opened?
A. Snapshot Q
B. Snapshot L
C. Snapshot J
D. Sapshot Y
Answer: D
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A. 16F B. 8F C. 4F D. F E. F/4
When using rays to represent the direction of light, these are drawn
A. perpendicular to the wavefronts B. parallel to the wavefronts C. so they have no relation to the wavefronts
Quasar's spectral lines are
A) emission lines with large red shifts. B) a continuum from the synchrotron radiation. C) fuzzy absorption lines from the merged light of the billions of stars. D) too complex for any interpretation. E) nonexistent, the gas so hot as to be totally ionized, so no lines are seen.
After World War II, the U.S. Government spent two decades investigating UFOs because they
A) were themselves developing new types of aircraft and used the official investigation as a cover-up B) thought that they might be new types of aircraft being developed by the Soviet Union C) knew that UFOs were alien craft and used the official investigation as a cover-up D) were afraid that an alien civilization was in the process of invading the Earth