A 5-kg piece of lead (specific heat 0.03 cal/g?°C) having a temperature of 80°C is added to 500 g of water having a temperature of 20°C. What is the final equilibrium temperature (in °C) of the system?
A. 79
B. 26
C. 54
D. 34
E. 20
Answer: D
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What is the most important reason why an icy moon is more likely to be geologically active than a rocky moon of the same size?
A) Ice has a lower melting point than rock. B) Ice is less rigid than rock. C) Ice contains more radioactive elements than rock. D) Ice is affected by tidal forces to a greater extent than rock. E) Ice is less dense than rock.
Free Fall: An object is thrown upwards with a speed of 16 m/s. How long does it take it to reach a height of 7.0 m on the way up? Neglect air resistance.
A. 0.52 s B. 1.2 s C. 2.4 s D. 3.1 s E. 4.2 s
What is interstellar reddening?
A) Interstellar dust absorbs more red light than blue light, making stars appear redder than their true color. B) Interstellar dust absorbs more red light than blue light, making stars appear bluer than their true color. C) Interstellar dust absorbs more blue light than red light, making stars appear redder than their true color. D) Interstellar dust absorbs more blue light than red light, making stars appear bluer than their true color. E) The spectral line shift due to a star's motion through the interstellar medium.
What evidence suggests that small galaxies in our Local Group have undergone two or more starbursts in the past?
A) We observe several small galaxies currently undergoing massive star formation. B) We see small galaxies in which many stars have one age and many others have another age that is billions of years older. C) We see evidence that small galaxies in our Local Group have experienced several collisions in the past. D) We see evidence that several small galaxies were shot out of larger galaxies in our Local Group during an age of starburst activity. E) We do not have any evidence that galaxies in our Local Group were once starburst galaxies.