Two stars have the same luminosity. Star X is spectral type F, while Star Y is spectral type K. Therefore, Star X is larger in radius than Star Y
Indicate whether the statement is true or false
FALSE
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A fish above the surface of water will see better in air if it has goggles that are
A) tinted blue. B) hemispherical. C) filled with water. D) extremely shiny. E) none of the above
A helium-filled balloon has a volume of 1 m3 . As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are ?40°C and 0.1 atm?
a. 4 b. 6 c. 8 d. 10 e. 1.5
How often does Venus rotate on its axis?
a. 24 h b. 182 Earth days c. 243 Earth days d. 1 Earth year e. 3 Earth years
A 2.5-kg object falls vertically downward in a viscous medium at a constant speed of 2.5 m/s. How much work is done by the force the viscous medium exerts on the object as it falls 80 cm?
a. +2.0 J b. +20 J c. ?2.0 J d. ?20 J e. +40 J