Magnifying Glass With the Image at the Near Point of the Eye: A person with a near point at 25 cm uses a magnifying glass of focal length 10 cm. What is the maximum angular magnification possible with this glass?
Fill in the blank(s) with the appropriate word(s).
3.5
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The energy transformation that occurs during downhill skiing is
A) kin E ? grav E. B) chem E ? kin E + therm E. C) kin E ? grav E + therm E. D) grav E ? chem E. E) grav E ? kin E + therm E.
A resistor R is connected across a battery of negligible internal resistance. If the resistance of R is doubled, the current in R will be ________.
Fill in the blank(s) with the appropriate word(s).
A 1200 kg car is moving at 5.0 m/s EAST. It strikes an 1800 kg car at rest. The cars have an elastic collision and move in the EAST or WEST direction. The relative velocity between the cars after the collision is
A. 3.0 m/s WEST. B. 1.0 m/s EAST. C. 4.0 m/s EAST. D. 5.0 m/s EAST. E. 1.0 m/s WEST.
What are the two key observational facts that led to widespread acceptance of the Big Bang model?
A) the cosmic background radiation and the high helium content of the universe B) the cosmic background radiation and the expansion of the universe C) the cosmic background radiation and the near-critical density of the universe D) the predominance of matter over antimatter and the near-critical density of the universe E) the predominance of matter over antimatter and the large scale structure of galaxies