Which of the following stars is the coolest?
A) B7
B) G9
C) K7
D) K4
C
Physics & Space Science
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An atom is excited when one or more of its electrons
A) vibrates. B) is boosted into higher energy levels. C) undergoes a frequency change. D) becomes frantic.
Physics & Space Science
A car with tires whose radius is 35 cm is traveling along a highway at 29.8 m/s. What is the angular speed of the tires?
A) 90 rad/s B) 85 rad/s C) 80 rad/s D) 75 rad/s E) 70 rad/s
Physics & Space Science
What characteristics of a sound wave are related to the "pitch" of a musical note? (There could be more than one correct choice.)
A) amplitude B) wavelength C) frequency D) period
Physics & Space Science
A container with a one-liter capacity at 27° C is filled with helium to a pressure of 2.0 atm. (1 atm = 1.0 × 10^5 N/m2.) How many moles of helium does it hold?
a. 0.041 b. 0.081 c. 0.45 d. 0.90 e. 1.0
Physics & Space Science