When a light beam enters glass from air the beam is refracted. Why does this happen? (Hint: What physical property of the light changes?)
Light is bent on entering glass from air because the velocity of the light is less in the
glass than it is in air.
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Genes are organized into long coiled chains called _______________
Fill in the blank(s) with correct word
When is friction a potential problem for applying conservation of momentum to a system?
A. When friction is an external interaction B. When friction is an internal interaction C. In both cases D. In neither case
Which of the following statements is not true about the planets so far discovered around other stars?
A) Photographs reveal that most of them have atmospheres much like that of Jupiter. B) Many of them have been discovered by observing Doppler shifts in the spectra of the stars they orbit. C) Most of them are more massive than Earth. D) Many of them orbit closer to their star than Jupiter orbits the Sun.
A hiker walks 200 m east and then walks 100 m north. In what direction is her resulting displacement?
a. north c. northeast b. east d. None of the answers is correct.