How can some mergers activate spirals, and others destroy them?
What will be an ideal response?
A merger between equally massive galaxies may create a giant elliptical, without arms, while a small galaxy sideswiping a large spiral may draw out even more striking spiral structure, such as in M51, the Whirlpool Galaxy.
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An 100-g piece of copper, initially at 295°C, is dropped into 250 g of water contained in a 300-g aluminum calorimeter; the water and calorimeter are initially at 10.0°C. What is the final temperature of the system? (Specific heats of copper and aluminum are 0.0920 and 0.215 cal/g•°C, respectively. cw = 1.00 cal/g•°C)
a. 12.8°C c. 18.1°C b. 16.5°C d. 32.1°C
What capacitance will have the same reactance as a 100. mH inductance in a 120. V, 60. Hz circuit?
What will be an ideal response?
An ideal transformer has 50 turns in the primary and 500 turns in the secondary. An input of 12 V will produce an output of
A) 12 V. B) 120 V. C) 1200 V. D) none of the above
Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). You measure the amount and determine that there are 5 grams of potassium-40 in the rock
By measuring the amount of its decay product (argon-40 ) present in the rock, you realize that there must have been 40 grams of potassium-40 when the rock solidified. How old is the rock? A) 1.3 billion years B) 2.6 billion years C) 3.9 billion years D) 5.2 billion years E) none of the above