Which of the following can't be associated with the spiral arms of a galaxy?
a. Dust and gas
b. Metal poor stars
c. Young, massive stars
d. Star formation
B
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How do humans use their eyes to measure relative distance by parallax?
a. By continuously focusing our eyes on distant objects we can determine distance. b. Since our eyes are separated the brain interprets the relative look angles of these eyes in terms of distance to the object viewed. c. Our eyes can measure the time it takes light to travel from an object and from this we get distance. d. By moving our heads from side to side our brain compares look angles from each of these positions to obtain the distance to the object viewed.
In an isobaric process
a. the volume remains constant. b. the temperature remains constant. c. the pressure remains constant. d. no heat is transferred between a system and its surroundings. e. the internal energy is constant.
Which of the following is a conservative force? (All refer to a car on a slope.)
a. The force you exert on the car pushing it uphill. b. The force exerted by rain drops falling on the car. c. The frictional force of the road on the car. d. The gravitational force acting on the car. e. The force you exert on the car (pushing it uphill) after it starts to slide downhill.
Ocean trenches such as the Tonga and Marianas Trench, are
A) subduction zones where lithosphere is pulled down to the asthenosphere. B) some of the steepest places on Earth. C) found at continental-continental plate boundaries that mark the the deepest places on Earth.