If you observe the night sky in the direction of the North Star, you will observe that
A) the other stars near the north star move along clockwise circles around the north star during the night.
B) the north star moves westward across the sky during the night.
C) the other stars near the north star move in straight lines from east to west during the night.
D) the other stars near the north star move along counterclockwise circles around the north star during the night.
E) the north star moves eastward across the sky during the night.
D
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The traditional theory of the formation of our galaxy cannot explain
a. the existence of the disk of the galaxy b. the fact that the oldest stars in the galaxy are not metal free. c. the spherical distribution of the globular clusters d. the difference in metal abundance of the population I and II stars. e. the existence of the nuclear bulge.
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?2.3 N/C, Ey = Ez = 0. If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vz = 20 m/s, vx = vy = 0, what is the distance from the origin to the particle at t = 2.0 s?
A. 60 m B. 54 m C. 69 m D. 78 m E. 3.2 m
Two long parallel wires separated by 5.0 mm each carry a current of 60 A. These two currents are oppositely directed. What is the magnitude of the magnetic field at a point that is between the two wires and 2.0 mm from one of the two wires?
a. 2.0 mT b. 10 mT c. 8.0 mT d. 1.6 mT e. 7.2 mT
For the ground state of the hydrogen atom, which of the following numbers represents the correct value of the orbital angular momentum quantum number?
A) -2 B) -1 C) 0 D) 2 E) 1