Which of the following is NOT a property of elliptical galaxies?
A. They have little dust or cold gas.
B. They have prominent spiral arms.
C. They contain mostly old (Pop II) stars.
D. Stars are distributed smoothly throughout their volume.
Answer: B
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Indicate whether the statement is true or false
Explain how interferometry works
What will be an ideal response?
Calorimetry: A lab assistant pours 330 g of water at 45°C into an 855-g aluminum container that is at an initial temperature of 10°C. The specific heat of aluminum is 900 J/kg ? K, and that of water is 4186 J/kg ? K. What is the final temperature of the system, assuming no heat is exchanged with the surroundings?
A. 28°C B. 32°C C. 31°C D. 33°C E. 35°C
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