What are the very cold (about 20 K), dense clouds of gas thought to be the most massive objects in the Galaxy called?
A) emission nebulae
B) absorption clouds
C) dust clouds
D) molecular clouds
E) reflection nebulae
D
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A two-slit arrangement with 60.3 ?m separation between the slits is illuminated with 537.0-nm wavelength light. If a viewing screen is located 2.14 m from the slits,
find the distance on the screen from the first dark fringe on one side of the central maximum to the second dark fringe on the other side. A) 57.2 mm B) 38.1 mm C) 76.3 mm D) 26.9 mm
Two separate pairs of binary stars are observed. The separation of the pairs is identical, but the orbital period of Pair X is 4 times the orbital period of Pair Y
How does the total mass of the stars in Pair X compare to the total mass of the stars in Pair Y? A) Pair X has a total mass 2 times greater than Pair Y. B) Pair Y has a total mass 2 times greater than Pair X. C) Pair Y has a total mass 16 times greater than Pair X. D) Pair X has a total mass 16 times greater than Pair Y.
A ten loop coil of area 0.23 m2 is in a 0.047 T uniform magnetic field oriented so that the maximum flux goes through the coil. The average emf induced in the coil is
A) 1.1 × 10-3 V. B) 0. C) 1.1 × 10-2 V. D) 1.1 × 10-4 V. E) 1.1 × 10-1 V.
These four motion diagrams show the motion of a particle along the x-axis. Which motion diagrams correspond to a positive acceleration?
a. A and D
b. B and D
c. A, B, C, and D
d. A and C