__________ galaxies contain large clouds of gas and dust, both young and old stars, but have no obvious spiral arms or nucleus
a. Irregular
b. S0
c. E7
d. Sa
e. E0
A
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A mass spectrometer splits a beam of 
and
singly charged ions having the same velocity by passing the beam through a uniform magnetic field. If the radius of the path for the
ions is 12.0 cm, what will be the radius for the
ions?
A. 9.90 cm B. 10.9 cm C. 12.0 cm D. 13.2 cm E. 14.5 cm
Which of the following best describes the principle advantage of CCDs over photographic film?
A) CCDs allow long exposures (e.g., minutes or hours) and film does not. B) CCDs capture a much higher percentage of the incoming photons than film. C) CCDs can record the colors of astronomical objects accurately while film cannot. D) CCDs can be attached to modern telescopes more easily than can photographic film.
A long telephone pole (wood density 0.80 kg/m3 ) is vertically lowered into a slightly larger vertical pipe which is filled with salt water of density 1.04 kg/m3. The pole ends up floating with what percent of the pole above the water?
What will be an ideal response?
550 g of water at 105°C are poured into an 855 g aluminum container with an initial temperature of 11°C. The specific heat of aluminum is 900 J/(kg•K)
How much heat flows from the water to the aluminum, assuming no heat is exchanged with the surroundings? A) 55 kJ B) 36 kJ C) 54 kJ D) 46 kJ E) 64 kJ