Astronomers think the Milky Way has spiral arms because
A. they can see them unwinding along the celestial equator.
B. Pop II stars, hot molecular clouds, and asterisms outline spiral arms.
C. globular clusters outline spiral arms.
D. radio maps show that gas clouds are distributed in the disk with a spiral pattern.
E. All of these choices are correct.
Answer: D
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A car travels in a flat circle of radius R. At a certain instant the velocity of the car is 20 m/s north, and the total acceleration of the car is 2.5 m/s2 37° south of west. Which of the following is correct?
a. R = 0.40 km, and the car's speed is decreasing. b. R = 0.20 km, and the car's speed is decreasing. c. R = 0.20 km, and the car's speed is increasing. d. R = 0.16 km, and the car's speed is increasing. e. R = 0.16 km, and the car's speed is decreasing.
Telescopically, Jupiter is the most colorful and changeable of the planets
Indicate whether the statement is true or false
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What will be an ideal response?
The resultant force R (in newtons) for the force system shown in the figure is:
(A) 29.5i 1 36.4j – 81.4k
(B) 229.5i – 36.4j 1 78.3k
(C) 236.4i 1 29.5j 1 81.4k
(D) 239.3i 1 36.4j 1 122.2k
