Rover eats 0.50 pound of dry dog food per day. How many 5.0-kilogram sacks of dog food does his owner need to buy in a year?
A) 17
B) 25
C) 52
D) 80
E) 81
A
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Escape Speed: How do the escape speeds for two rockets, the first weighing 20 N and the second weighing 20,000 N compare?
A. The escape speed for the lighter rocket is smaller than that for the heavier rocket. B. The escape speed for the lighter rocket is the same as that for the heavier rocket. C. The escape speed for the lighter rocket is greater than that for the heavier rocket.
Which of the following statements correctly explains why galaxy collisions should have been more common in the past than they are today?
A) Galaxies were closer together in the past, because the universe was smaller. B) Galaxies were more active in the past and therefore would have collided with each other more frequently. C) Galaxies were much bigger in the past, because they had not contracted completely. D) Galaxies attracted each other more strongly in the past, because they had not yet turned most of their mass into stars.
What is the current limit to distances we can measure via parallax, until the results of the new Gaia mission become available?
A) about 100 light years B) about 1000 light years C) about 100,000 light years D) about 10,000 light years
This figure shows frames from a computer simulation of star formation, starting at the left with a large molecular cloud measuring more than a light-year across. What is happening as time passes (from left to right)?
A) The cloud is fragmenting into smaller pieces that will form stars. B) The cloud is developing hot spots that shine more brightly within it. C) Magnetic fields are forcing the gas to align in intricate ways along twisted magnetic field lines. D) The cloud has been hit by a shock wave from a nearby stellar explosion, which causes the gas to move violently around.