A block of mass 2.5 kg is acted upon by a single force, producing an acceleration of 2.0 m/s2. The force has a value of
A. 10 N.
B. 5.0 N.
C. 0.5 N.
D. 2.5 N.
Answer: B
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When an atom absorbs a photon containing energy, any of the following can happen except which?
A) The atom becomes excited. B) The atom is ionized. C) An electron moves from an upper energy level to a lower one. D) An electron moves from a lower energy level to an upper one.
The choices below each describe the appearance of an H-R diagram for a different star cluster. Which cluster is the youngest?
A) The diagram shows main-sequence stars of every spectral type except O, along with a few giants and supergiants. B) The diagram shows no main-sequence stars at all, but it has numerous supergiants and white dwarfs. C) The diagram shows main-sequence stars of spectral types G, K, and M, along with numerous giants and white dwarfs. D) The diagram shows main-sequence stars of all the spectral types except O and B, along with a few giants and supergiants.
In what way is Pluto more like a comet than a planet?
A) It sometimes enters the inner solar system. B) It is made mostly of rock and ice. C) It has a long tail. It has a moon.
A curved mirror that produces an enlarged image will also have a greater field of view than a plane mirror
a. True b. False Indicate whether the statement is true or false